 You're going to get a small glimpse of what Infrastructure is being built up here every year. So Please give it up for all of the people of our various infrastructure crews and we'll start with Leon and the 32 c3 knock review All right. Good morning everyone. This is the knock talk So I start with the bad news We had no sauna this year These years were quite interesting this year because We had some problems acquiring backbone hardware, which was quite serious usually we had a Sponsor who who lend us a ton of equipment that we can that we could use and that we had everything from one source And that was really easy We just send a wish list and we got everything we wanted and we could Build the nice network with many features that we didn't really need but just made it fun to have This year, however The sponsor had already agreed to do the same thing again, but then they had some internal difficulties So they couldn't do that and we learned that Basically one week prior to build up. So I got a phone call and we basically were left without any backbone equipment So it was back to the roots What have you done in the years before? We called many people and we got many offers from amazing folks who helped us out We decided that basically everyone in the north would bring his first box and it'd be fine So the temperatures were fine in all rooms the first boxes don't have that much energy to dissipate So this happened Now what we seriously did was some emergency planning we got help from many amazing companies, especially We have to thank team makes Who are in Nuremberg a company? They've been incredibly helpful and arranging stuff from their storage. I'm talking to people if we can use their stuff and We spend many hours in the phone late in the evening with the men from team makes so that was really helpful. Thanks for that Um other companies helped as well. I'm specially Huawei Via the company called 10 ICT who lend us some routers Secure link, which is another Netherlands company helped us with equipment and e-kicks and some They've learned a big router and switch Which we use in the data center, so what we ended up with in the end Was this equipment? It's a basically Basically, it's a it's a mixture of many vendors which made the network very interesting to build But it worked out pretty nicely in the end. We we even got the Force 10 router the e600 which we had first used at 20 feet 23 seats C3 Which we got from a friend of mine Our friend of us and the good thing about that is we don't have to give it back So that was really useful Yeah, you want to continue in the backbone Okay, I think that's working out. Thank you Yeah, with all the equipment we got in we went in and did basically within one week a complete redesign of the backbone We had we knew of course in which patch rooms we needed to go and How many ports we need an edge each pet room, but the whole VPLS routed setup we had in before was Oh, yeah, this is maybe you can see it in the first two rows or if you have really sharp eyes often in the back rows But yeah, it's also later in the slides So yeah, we went in and redesigned the whole the whole backbone basically with this year We just did a simple layer to backbone no VPLS nothing fancy. We just needed to get it running The routing was done mostly usually on the who are wise in the larger patch rooms and We were as in the law since we've been here in the IP in the CCH actually We've been in the data center of IPH age where we were connected to upstream ISPs and had four times 10 gig WDM back back linker to the CCH here and then we had a couple of upstream ISPs to for the For the first time we had 10 gig from Deutsche telecom here in CCH so for the first time since we've been here we had actually redundancy on the uplink if the uplink to the IPH age would fail We would have still 10 gig to Deutsche telecom for internet traffic here in the CCH Which was pretty cool to have and then at IPH age we were connecting to e-kicks internet exchange point to kaya global KPN and LWL come our three other upstreams and At e-kicks we were mostly doing peering with the route server later on there came a peering session to Kabul, Deutschland And we had two peering requests from one ISP which didn't set up the IPGP session actually So we're still waiting for it. They have still a couple of hours before we shut down our equipment So maybe we'll get it in the end Yeah, and with all the well all the actually quite big ISPs we had as an upstream we had the Some problems or not some challenges difficulties balancing between those uplinks. We were moving around traffic a bit from one From rome some AS is from one uplink to the other and stuff like that To to balance it out and to find a good find good connectivity basically for all of you And in the end I think we managed to do this and we had quite a few complaints and The DD us as we're coming in pretty fast too. So I guess we were pretty successful with that So after all those years we use the e 600 Basically many years in Berlin then we didn't use it in the cch and we used it at camp again this year We finally found its limits Because this this white was always like that one box that always stood up to the challenges of the Congress But this year I think we refilled its tea camp table Which couldn't hold more than 16,000 IPv6 neighbor entries Well, it's basically you have three entries per device So there's not this many entries basically so that device was just too small to hold all the all the v6 traffic But yeah, we could mitigate that by moving v6 routing to another device. We still had lying around so that worked Another issue was that for the first time We actually had a DDoS so someone tried to attack our network from the outside Basically they filled two of our 10 gig uplinks with DNS amplification traffic So that was one evening of some issues for us was It was going against one of the Kolo servers So we don't really know if they were trying to attack the event or Some specific server they didn't like but we could mitigate that with the help of our upstream knocks. So that worked What we tried to do with KPN this time, which is one of our uplinks is to run a 100 gigabit connection to them They Arranged they arranged hardware, especially to do that test with us And we arranged hardware to do that to do that, but in the end it didn't work. Well We tried some we suspected a broken optic So flex optics sent us another one, but which didn't work either So we are suspecting currently a broken line carton there out or something But yeah in the end we were stuck with with your grandmother's 10 gigabyte ethernet again But that's fine. We don't need all the bandwidth. It just would have been nice to test the the technology Marcus Yeah, and then we had some problems problems with IPv6 routing on the Huawei's Basically, they were working quite fine in most locations But in in one of the patch rooms where we had a lot of VLANs terminated there were It seems like they were running out of cam basically which is the memory where the addresses are stored in and We noticed that it was mostly for IPv6 only We had packet a strange packet loss on some VLANs not on others so it was quite a hard problem to debug and to find out eventually and When we when we figure out that it's it has to be cam related We are moving most of the routing of the one patch room back to the e600 Which made sure that it was still below 16,000 neighbors of course and then suddenly The latency went back to normal on the IPv6 networks and everything was working quite fine We didn't really find out what happened there But it had to be something like that and we had the same problem basically with a Wi-Fi network where We had almost like what we have the numbers later eight thousand something users in there So we were routing that at the beginning on the on the e600 basically, right? Yeah, yeah on the e600 and There we have running in the cam issues, too Then we were moving this actually to an mx80. So moving about around a little bit of locally without a traffic but then it was fine and Then in between there were some people trying to be funny and sending some stuff to our monitoring servers Which took down some of the monitoring for some time, but eventually we found we found out that too and we're blocking the IP addresses and then We could see that all the network was working anyways, so that was fine, too Yeah, and then we have some Some random notes so to speak We were no we were noticing that the Facebook traffic was really really low It didn't it didn't get into the top 20 to top 200 of the ass that's Yeah, we were joking that the most Facebook traffic we seen was that one visitor walking around in a Facebook shirt And actually on a quite interesting note there was more v6 traffic from Facebook than before traffic So that's good to come somehow For the colonel we saw this year some requirements. Oh, yeah We need there's like 10 times 10 10 10 gig know it wasn't 10 times But some people wanted to actually have multiple 10 gig channels for the for the servers I mean we are quite happy to write connectivity in Kolo We were quite happy to provide the Kolo and do anything we can to provide bandwidth there, but There are there are some limits So we think at least at this for this Congress 10 gig was quite enough for one server in the Kolo, so Especially I mean the people couldn't know that we had this problem with the backbone and everything else but still I mean Please keep your requirements aligned with the reality That's all what we're saying We learned some interesting new facts that well people couldn't tell us when we asked them We have om2 multimode fiber in this building and With the hectic arrangement of hardware before the build-up We had a situation when where we had to run 40 gigabit either net links between some sites Well, we would have only needed 10, but we had the equipment only for 40 gigabits So we had to figure out whether those links would work over this fiber that's not designed for this kind of use The the stuff is specified to run for 100 meters of a om3 fiber, which is better fiber than we have And we were able to get it working for 190 meters on the bad fiber we had so that was nice to learn Yeah, another interesting fact that's barely visible in the slides due to formatting fuck up the maximum outgoing traffic was 21.4 gigabits per second people always ask for that number Which is about four gigabits more than last year, so it's steadily increasing Here's the pretty graph That's just it just shows the load on our backbone links. We just noticed that an hour ago. It would be fun to show This is where we announced the end of the colo or the shutdown of the colo So basically all of you walk to the colo and probably got their servers out. So most of our traffic is gone now Wi-Fi we have Wi-Fi No, but but really we have Wi-Fi I What we were using this time the same as last year were a rover controllers to High value in a high value the high availability setup with 10 gig links Towards the core we had deployed 145 access points throughout the building in all of the building we saw 20,000 unique clients Had a peak of 8,150 clients so it's not over 9,000. Yeah, our wife. We had Wi-Fi team didn't deliver on that apparently Yeah, and so On a really serious note we saw 40% of clients on on the unencrypted network Which we really couldn't explain because we were actually Trying to push the people on the encrypted Wi-Fi. We had the 32c3 SSID and the 32c3 open SSID and somehow 40% were ending up on the unencrypted open network Although we provided an Android app to configure the encrypted network. We had profiles for Apple and Windows and Basically, we did everything we could just to get the people you using the encrypted Wi-Fi and still 40% decided I know YOLO that's Well, maybe in the next year we see a decrease in this number it would be quite fun actually the obligatory username statistics because as you know you can choose any name you want Number seven is an improvement from last year. It was on number 11 device statistics This time linux has one Together with everyone traffic statistics, we saw an average of three gigabit per second Coming from the Wi-Fi which is well at the sum of received and transmitted data Peak of four point five gigabits So one and two were the most busy areas of obviously they had the peak of one point seven five gigabits per second So we in this in this deployment we see a much higher average bandwidth user Bend with usage per user then a normal roll out of this size So it means you guys are much more active on the internet for some reason Yeah, and we can see this in this pretty graph too. That's the the atom usage on five gigahertz and sal one so basically Everything is you in use. We don't have any spare spare frequency and anymore and Yeah, we're trying We're actually trying to push as much traffic as is physically possible through those ways like it's for those Frequencies that we that we have So this year our wireless people decided to try To try to build a probe system so they can actually monitor the quality of the Wi-Fi they've built Well before we could just monitor them by do we have complaints from the users? But this time we have actual measurements. So data which they've built five open WT devices with WPA supplicant installed and Then they've run automated tests on them for ICMP ping checks. Can we get a DHCP lease? Let's try to download this file via HTTP and see how long it takes things like that. So what you can see is Well, the download speed was limited to 15 megabit per second And during night time when the rooms were empty You could actually get the speed But once people would come in the speed would drop. So that's a that's interesting data to have While designing the network for the next event or something We had a bit of problems in the Wi-Fi to of course all challenges We had some performance issues with the e600 on the first day Which were was adding up because it was running out of cam apparently a lot of latency to the to the wireless network and basically to most of The net to the network traffic that's going through it When we moved the traffic away from the e600 the throughput doubled basically after day one so we figure out then that we reached the limits of the e600 what you what we're telling you before already and And We were hitting the physical limits in the zal one two and three most of the time with a channel utilization Do you just you just saw so we either need more spectrum or a more efficient usage of the spectrum that we already have and In this regard Our Wi-Fi team is asking if there are some people who have knowledge of this area of running Wi-Fi network for How many have you 20 12,000 15,000 people and With with a bent with we're having They'd like to talk to you about how this can be done if you have any ideas or whatever You can get a get in contact to us. I mean this doesn't of course You can still talk to us But we don't really need an experience for someone who has like a fritz box at home. We still have this experience ourselves, of course So that we really need like the experience of P of engineers and people who are running this high-capacity Networks with with lots and lots and lots of users and bandwidth and the last problem We had was the the fast radar detection We had this last year already. We were presenting it talking a bit a little bit about it basically when there's Some noise going in on one frequency the why we had just Wi-Fi just just shuts down because it's thinking Oh, there's like radar from from the from the airport traffic control or whatever Coming in and then it shuts in it needs to shuts down. This is a known bug in the Aruba's or Something like that, I guess and It's still it's still not fixed. We are we're still still seeing this problems But apparently it's got better in the newer devices, which we didn't have or didn't have that much from right 50% okay, so 50% of the people were able to Continue using the Wi-Fi when those events come in which is not so bad Another topic is the people who we need to thank We couldn't get a better picture. Sorry So we would really like to thank the kind folks from the knock help desk who who always are our firewall They just take all your requests and complaints and they try to help you guys and they Forward the serious stuff to us so that Well, we have actually time to work on the network. So thanks for that and on the last note The traditional thanking to the sponsors because these are the companies who actually make this event possible It's especially in a situation like this year when we were left without equipment Basically, it was good to have so many companies that you can still rely on who would jump in or would still provide their other stuff of their respective areas So thanks for that again. I think we're done. Are there any questions? So thanks very much for the for the great work Just two quick questions on the Wi-Fi in in Hale in sal lines Well, how many access points did you have in hale irons in total? And I was just wondering per access point We're using only a single channel per access point or can the access points have several channels at the same time on? Thanks, Arianna want to go on that? Here's our Wi-Fi man So we were using 18 access points in sal one and Though those were using pretty much all of the 20 megahertz wide five gigahertz channels So they were on different channels. Yes. So each access point has one five gigahertz radio So and it will use up one 20 megahertz channel. I Guess that's also the controller solution, right? I mean they see each other and they distribute the Did we assign it separately separately? Okay, I'm being told there's another question from the signal angel Is that correct? Yeah The most interesting question is how did you get peering with Deutsche telecom? It was actually transit not not just peering Yeah, well we asked some folks Okay, so it's not rep you're reproducible Well, we hope to reproduce it next year, but we'll see yeah, you can I can't I Have another one which is Why is the wiki down? I'd like to stress this this year again. We do not run events that sees a CD. I Guess the last question from the internet is what funny thing did some users do against the monitoring system? Some blah, I don't remember there was some weird packets that put heavy load in the machine or something Sunflat apparently okay, Sunflat easy a few years ago Notty Henninger and I did a study where we found thousands and thousands of devices all over the internet that had weak RSA encryption keys for like SSH and TLS because of bad random number generators and we could compromise all of them for that reason and I'm wondering whether right you guys can can help us with this because a very large fraction of them were Fritz boxes We are returning all our Fritz boxes, so we don't have to do anything with Fritz boxes anymore Do you think next year you could discourage use of the unencrypted Wi-Fi more by giving the SSID a less innocuous name like open instead and call it like unencrypted or Insecure or something for yeah, we can try that We do have some success by discouraging people from using the 2.4 gigahertz networks by giving it the legacy or Even slow name or something So that works. Yeah, we can probably do better than that Wireless questions specifically hall one to get the network working Do you run the access points at full power or do you have to reduce it to make the cells smaller? Yeah, we have to reduce the transmit power. So we get cells that Overlap the lease as possible. Thank you. I was wondering next year Would it be possible to get better Wi-Fi coverage in the bathrooms? You know the funny thing is this was on our list for this year So I'm not quite sure what failed there, but well We are aware and we're sorry. Yeah Do you try to turn off the unencrypted network? well We didn't try that we know what would happen, but We don't really want to but we would like to discourage users But we still want to provide a connectivity for people who I know It's a hacker event, right? So if you want you should be able to Have your data sniffed or whatever Okay, one more question from the signal angle Yeah, how many abuse messages did you get I'm sorry, I don't have this number this year this time around Kai is coming. Oh our abuse handling person is coming Hello scroll scroll 48 males were like 95% are automated about port scans because it's still Just use for stupid pot scan the network most of the time and we had I think roughly 10 calls Where one was more less serious and the other ones were like really unimportant and easily to fix I've got one of those calls someone has sent a spam email Which is of course not a good thing to do, but yeah Okay Okay, all Okay, all right. Who's next? blank stares Yeah, that looks like a walk review So if have any people left the room do we have new free seats? I see I see two over here one over here because we have people standing in the back so they can find a seat All right Yeah, just you know keep coming keep finding the free seats people keep their hands up All right, then please give it up for the walk review. Oh, yeah. No it is. Okay, so As some of you might know last year we were more or less the virus operation center with half our team like falling victim to the Congress solche we tried to do better this year and Well more or less worked We have like a few sore throats, but no casualties this year. So I think we did all right So the setup was more or less similar to last year. We we had um In the uh in each of the halls we had like two to three cameras three in the two first two halls and two in hall six and hall g Being mostly mixed or being mixed with uh hardware video mixers and uh lots of equipment in between Which mostly came from uh, which mostly was made by uh black magic design So video mixers signal conversion like converting hdmi to sdi and Scaling and stuff and backup recording to ssds and so on We got requests to like talk more about how the actual signal flow looked like so I Included one of the pictures and from hall two Um So we um, I'll use the cursor probably so, uh, this is where the uh speakers insert Well, the the speaker signal gets inserted Which goes to a switcher which also outputs to the uh Projector and can also loop back to the video mixer, which is connected to cameras Um, I can't read that Oh, yeah, and there's a scale off of feeding back the uh output from the screen to the uh video mixer as well So we can take the info beamer, which is the uh thing which plays during the breaks Uh to and put it on the stream as well um One thing we we do which might not be obvious if if if you haven't done video stuff before is that we uh Embed the audio signal Later in the chain. So the video mixing itself happens without the audio and we have a central I have a slide the next slide is about that. We have a central place where all the audio from all the halls gets uh, uh collected and Mixed and redistributed and we only embed the audio after the mixing which uh makes a lot of things easier, but also causes problems from time time to time because um You like have it's it's not local. So if there's a problem in the hall You have to call up to the it's the central it's central audio regime. We call it um and talk to them and that's That caused Some problems, but we were able to fix most of them at least in the releases if not in the streams Yeah, so um this then we split the signal to uh one backup recording which is just recording everything on on ssd's we Hope we don't have to use that but it has saved us A couple of times this year already and we had that the previous years as well And then they go to two separate boxes one of which does the recording and the other one does the streams So yeah, and this is the control panel for the The control panel for the mixer So that's hall two which is slightly more complex than hall g or hall six Hall one is mostly similar. Oh, and we also have a gopro input with which is the one in the front for if somebody has to Or wants to show something Like hardware or so on So yeah, I think I covered everything more or less All right, we also have let's see only picture. I got we have a Like I said a big audio mixer which collects all the audio signals and All the translation signals as well so we can Balance the levels after After the Audio Mixing done by the cch itself So we can react more quickly and do some stuff which wouldn't be possible otherwise like ducking in the in the translation Streams and so on We also did the zender syndrome this year again We we already had that last year and we decided to do some well experimental stuff or research We wanted to have a software video mixer which can do hd for the smaller smaller conferences we do over the course of the year and We one of our team was developing such a video mixer, which we call which is called vocto mix Uh, it is based on g streamer and we decided well, we have to try it sometimes so well, we actually Tested it before of course, but this was really the first big conferences were Conference where it was in use and it worked surprisingly well. We had some minor hiccups, but I think There was no lasting damage as in all the recordings got through so if you if you'd like to See how if you need hd Capable software video mixer It's open source. We can you can go there and please send patches and and so on So about the recordings We had about 133 hours worth of talks in all the halls together so that's That doesn't include a zender syndrome because that was tracked in another project in our internal system This is only hall one two g and six We do releasing it in eight formats So we do hd releases sd releases each of those in mp4 Which is h2 h2 6 4 and a c and web m which is in our case vp8 and Vobbis we also do audio only releases and because well Most of you when they if you go to media cccd and watch the or try to watch the talk in your browser You might notice that you get a random like either the translation or the originals audio signal And this this actually depends on the browser you're using and and The face of the moon and whatnot Is actually the only browser which handles multi-language or multiple audio tracks in video files on the web correctly is ia10 So so that's pretty sad So we also have to we also demux We create additional releases which only contains single audio tracks to to cater to broken browsers So if you have issues like that playing playing getting the wrong audio or something Just download the file and try to try vlc or something. So in the end this amounted to more than a thousand hours of encoding and Actual files ending up on on on various servers Uh, if you have in cpu time, that's probably about like five of three thousand hours of encoding time All right, um the reading status we this year we were able to or we were allowed to record Almost all talks, uh, but one which was the the play in hall one When I when I made the slides, uh, we released, uh, we already had released 30 of those 152 talks, uh, this number is probably higher by now We'll try to get most of as many talks as we can out To until we have to leave and until the the network gets cut down So we hope that Well, most of them will come out today and the rest will hopefully come out soon once the our hardware has traveled to its home again and Has we've gone to the rest of the releasing process So the talks which are not going to be released today will hopefully happen in the next one or two weeks tops Yeah, so you can go to media cc.de or we also publish the talks on youtube All right streaming on the other hand Uh, it was pretty similar to last year. We uh dropped. Finally. We we felt comfortable dropping rtmp So only hls and web m with the majority of the the viewers actually going to web m because Browsers the only browsers which natively support hls our apple device. So that was about 10 to 20 I think and this year we also be able to offer hdfs on all relays like For the website itself, but also for the stream people came to us for the past few years and requested that So we built it this year and that was mainly possible. Thanks to let's encrypt because we have lots of servers and like going either getting like huge amounts of wildcard certificates or going to Going to the process of getting like 50 different certificates by copy pasting csr somewhere Just isn't fun. So let's encrypt made that easy for us. Uh, that was quite nice So this is our, uh, how our cdn looked like the Server cc in the bottom that's 17 if I didn't miss count is the ones which were serving streams to the users This is our source which is in in in in a collocation space here in in in cch and we have a distribution layer which just handles the load of Actually pushing the data to the edge relays because uh one edge relay gets fed with Approximately 300 megabits just the all the streams. So we can't do 17 times 300 from just one server. So that's why we have this distribution layer one of those was in two of those servers were in in in the united states actually so people coming from the united states Were pushed to a local server. We also had a server in inside this building and also went to pushing people from 3233 To that local server to ensure that you don't have uh, or you have like less less round trip time more or less Peak fever is still a thing So you can see peak fever over there that was like five and a half thousand viewers in hall one We also have a little peak jeopardy over here Yeah, so we ended up Serving almost 20 gigabits of streams At the peak and Well less in an average so something like 10 gigabits which which was 10 gigabits On average during a normal day, which was quite a bit more than last year. So, uh, yeah One of the reasons is that we actually Enforced hd by default last year. We we had hd as an upgrade path so to say and Well that seemed to have worked we pushed more than 100 terabytes of stream data to use us all together And as it turns out streaming to a deutsche telecom isn't really fun We had to actually push telecom customers to a specific subset of servers which had Less than shitty peering to telecom. So Yeah, and actually most of the telecom traffic was served from Cch itself via the nock link. So thanks for that that has helped a lot So there are a few other teams which are well, not exactly the video team, but related So I I collected some statistics from them as well. So first as the subtitling team which this year again Did live subtitling in halls one and two and they subtitled 82 talks which was all of them Um And the number of characters they typed was 2,014,021 They had about uh, I didn't get these numbers in time for the slides. So I'll just say them They had like 60 angels which did that. So that was great as well And speaking about angels, uh, we had like video Angels manning the cameras and the video mixers and so on. Uh, that was about 250. So Well, thank you I tried to call the translation team, but uh, the phone just didn't Didn't uh, they didn't answer the phone. So I pulled this these statistics out of our recording system So these are not complete, but they give you a rough idea how how how The translations were distributed. So we had uh, three German talks which weren't translated and nine English talks Uh, but comparing that with, uh, 105 English talks which were translated to German and 19 German talks which were translated to English. That's a pretty good, uh ratio, I think Yeah and And also this is uh, I think it's the first time we actually released, uh, uh A video with three audio tracks. So that's uh, originally German translated to English and also translated to Switzerland That was the yesterday's hacker jeopardy if I'm not mistaken. So if you want to watch that All right So if you want to know more details about the how the post processing works and so on you can go to our wiki The setup described there is not exactly what we do on congress, but many of the parts are still the same So there's some documentation there and there's also a talk from proscon linked Which explains some of that. So, um, see you at easter hack and Have a nice day So we're going to start switching speakers already and might do one or two very quick questions because we are running low on time So if you have a question, I mean signal angel go ahead. You already have a mic Uh, the first question from the internet is still buffering. Um, what were the audio problems during the opening event? He would be able to explain more about that but the audio problems during opening can you Yeah, some some magic happened and it didn't do the magic anymore. So Um Yeah Any other questions here? Yeah, uh, did you think about broadcasting the streams on dvbt or dvbt? Yeah, we thought about that like we we tried that last congress in preparation for camp and we um Ended up deciding not to do that this year Inside the building because it's not really all that useful and we Uh, because instant propagation of radio inside a building is not all that good and um, the well the idea during 31c3 was to evaluate the technical problems and we managed that so we didn't do that We were thinking about doing broadcast like putting an antenna on top of the building and broadcasting to hamburg but That didn't happen because of lysis Um, well a radio license issues, but we might try that next year Okay, all right I think we're running out of time and to give the other teams chances to speak. We are gonna Move to the gsm review Hello. Hello. Yes. Okay. Good. Thanks. So gsm we had a We had a test network again this year, but um there There there's a gsm spectrum Situation in germany at the moment. So the regulatory body the bundes netz argentour they in 2015 auctioned away the test Spectrum The the decked guard band that is between the frequencies used for gsm and the frequencies used for decked handsets So because this spectrum is in between the two ranges It's it's traditionally been held free because you know, there might be some they might sort of bleed into each other Anyway, now it's gone. It's auction off and So we couldn't apply for a test license. Well, we could apply but we wouldn't get one and it looked really bad It looked like we would get no spectrum at all And so harald welter one of the osmo com developers He he wrote a blog post About this and a few days later Well saying in his blog post that it seemed like we would be able to have no network Actually because of the situation and a few days later. He was able to write another very good blog post saying that we would have a a network because he got some some some contacts from or Somebody from vodafone got in touch and said well actually this isn't being used just yet So it's all right for you to to use it one more time They gave us permission and we applied at the bundes nats argentua and we were assigned Assigned one more test license So that was that was great We had seven well some of them are still up. We had seven bts is operating in the building That's a little bit less than we've had previous years They were each on their own Arfkan their own frequency in the 1800 megahertz band one in the rooms 12 and g the larger room upstairs one in the gsm room Upstairs one outside here in the foyer and one two stores up and one over in the hack center So we did some new things this year We implemented half rate the half rate audio codec Which means that we were able to accommodate twice as many calls As as previously That's good now. There's also an open source working open source implementation of this which was indeed finished during during congress now and And we also operated gprs for the whole event on one time slot on each bts So that's one eighth of the frequency capacity was reserved for packet data and this this was used and it it worked The the thing is so you if you do this you have to you have to determine in advance how many how much frequency spectrum you're going to allocate to packet data versus Phone calls and that's sort of fixed. It's not so easy to do that dynamically. So We started small and and let's see what happens. So we had some some subscribers Show graph in a bit lots of sim cards and no stupid bots this year. That's that's good peak activity 66 calls in within a minute was the maximum load on the network And 38 sms messages Sent within one minute The total number of sms messages 15,939 So well done and It seems that about 450 or so of them didn't actually deliver Didn't arrive at their destination. Maybe the phone was switched off for too long or Nobody there was no subscriber with that particular number. Who knows There was some gprs traffic as well not No gigabytes Right, but megabytes at least at least something. Let's start small A hundred and sixteen or so megabytes received by the network. So sent by Devices and 475 megabytes transmitted by the network. So received by the Devices and some some pretty graphs. This is a snapshot from from a little while ago The the three on top I already went through that's the number of active subscribers and the total Number of sent messages in gprs traffic and on the bottom you see the the channel load so the The activity of each bts Each of the seven bts is that we were using Finally, so what about next year? We don't really know it doesn't look that great and The we're it's it's pretty certain that What a phone is going to be using the the their spectrum that they've acquired next year and Sad sad sad panda sad face If you have any way to to help us out with some spectrum In downtown hamburg between christmas and new years in 2016, then we would love to talk to you And and this is really this is really a unique and important opportunity to exercise the open source Software and hardware that we have for cell phone technology. I know I maybe you catch caught herald's talk On on the new 3g work that is slowly Coming off the ground and by next year. I I would be super excited to see that Implemented now I mentioned yeah, so so if you can't help please get in touch I mentioned sim cards As it turns out we found half a box of sim cards left over so if you're interested in those come find me after After the talk that's it for me. I guess we can take some questions Yeah, so we are gonna start switching speakers already and in the meantime Take a few questions So if you have a question in the room run to one of the microphones If the signal angel has one he waves his hand like he does right now um yeah The question a question is were there any special Services provided via gprs and were there congress WAP pages still remember that There were no special services implemented by by us and there was no WAP Content provided, but if you're interested in in doing so please please get in touch and and we'll We'll make sure to set something up. Oh, there's one thing one more thing I should mention about the sim cards they so the sim cards from 31c3 a year ago The ones from camp this summer and the ones from this event. They are all java cards and If you're interested in acquiring the the keys On these cards Get in touch with us. We can we can give them to you if you want to implement for example some some sim toolkit Athletes and there's some some source code that was released just before congress as well And if you're interested to work on that Okay, perfect. Maybe one one final very quick question Have you tried to combine the text messages from the voice over IP with the sms because That's didn't work. I think but it could be interesting Have we tried to combine text messages over over packet you mean? Yeah, there is a voice over IP also to call and You can also send text messages with that protocol, but Do you mean it was not possible to send sms cp? Do you mean cp text messages? Yes, okay No, we haven't tried that. There's no no cp to to gs cp to sms gateway That's also an interesting project if anyone wants to work on that Should be should be pretty easy the park Infrastructure is is easy to integrate with Okay, thank you Okay, perfect. You are the last question one sentence question one sentence answer My question is what kind of hardware was involved in this entire network. I'm mostly interested in the bts The hardware we used our sysmo bts sysmo bts is and what was the second part of your question That I was mostly interested in the bts All right. Yeah, so the the the bts is a sysmo bts and it has an ethernet Connection to a server where we're running the open bsc open source software to control all these seven bts Thank you. Okay, perfect. Thank you and We technically have two minutes left for silk road, but we may might run one or two longer So, uh, yeah, please silk road Yeah, hi, um, we are part of the team that set up this year's pneumatic tube network But we also attended camp Some people thought we weren't there but we actually were Our village got Located or moved to another spot. So we weren't able to build the network we wanted Um part of the reason was Because um, there's there were security ways that we couldn't cross But uh, we didn't we tried uh to cross them um Turns out that the clay soil in millenberg is actually pretty hard to dig trenches into We also have some uh statistics from camp that we couldn't show the at the last Infrastructure review So all in all, um There are about 118 captured sand from our central node Um, unfortunately as most of you know, there was a little downpour at the camp one of the last days So, um, our measuring hardware that we would have loved to use at 32c3 somewhat corroded There and we weren't able to use it So this year's network looks like this. It's a bit larger than At last year's congress. Um, but this year we were also able to handle all the traffic from A single central node. So Most of you have seen the router upstairs So it's able to route all the traffic to the central node and back to all the nodes again So some new developments, uh, we did um for the camp, um, we actually Wanted to collect the statistics from all the nodes and since we planned a large network with Nodes that are far apart. We figured we needed some kind of two wire bus that has to use cheap cable So, um, this is somewhat rs485 ish Two wire bus you can check out the code and get up And the hardware schematics and this is also this stuff we used to control the routers Yeah Yeah, because of that de central or that central approach we needed some communications That's why some other guys set up some field phones to every station And uh, they were heavily used even, uh, especially in the mornings when the smaller hackers were there. That was quite fun And now that's our router It was really fun It had three tubes one tube coming One tube coming from the hack center and three other tubes one going to the park to got open for you and the other one was actually Yeah, we'll come to that later. It was really fun Because of that central approach We could provide suction as a service So that Yeah, I got rid of that noise problem We had some yeah, not no one really who Who could provide an electrical switch? So we choose another approach And we had that third tube at the router that was really really fun. It was good for trolling podcasts Because it was on the stage at the zended center Yeah Um That was almost everything we would love to to have more More people who help us if you want to help us get everything set up come here Come here on day minus three or so and just help If you have nice ideas contact us via the mailing list and Yeah