 So hello everyone we're here to tell you about the adventure we've had over the last year building the site the infrastructure You've been using show you how we built it the challenges we faced and how you used it And since everything started from the site design, I'll start by introducing Russ from the admin team who is responsible for it Yeah, so I'm for the first time in infrastructure review I'm actually going to talk about something and mostly about the bits of over-engineered technology that we used to actually design and plan the festival oh There we go So this we we signed the contract for the site almost a year ago Actually, I think that was it seems like a really long time ago And we've had a couple of site visits up here where we've come up and camp for a weekend and gone round and so Worked out where everything might go and it's it's exceedingly difficult with this site because there's a lot of light It's everything has to be on something Approximately flat But that's that's not many places around here And it also doesn't have to very importantly the tents don't have to go on top of water mains as we found out in 2016 and And various other like more practical things like where do the roads go? How how can we use the road so that we can't that we don't have to rent in so much trackway and so on? So this is one of our planning sheets that we did back in like March or something where we kind of drew in what we thought We had to do and then this is our CAD plan with all the layers turned on So it has like the underground services and the power and the Network and the lighting and ducts and pipes and all sorts trees stumps and That's that's how the web map is generated is generated directly from that that CAD plan it did that we have This increasingly sophisticated pipeline which we can use to turn a CAD plan Which is good for precisely planning where things go and making sure that you know the tent is not too close to the track or things like that and Also, and then that turns it into a web map, which I completely rewrote this year to be Vector and fancy and it mostly works except in some people's weird browsers, but this is not my fault Oh, yeah, there's a diagram of that because which used to be much more much more complicated, but this this is the kind of simplified new diagram, which isn't quite as Annoying and yes, the doc the docs are out of date. Sorry as always We also got signs this year. I'm not sure why I'm talking about these But it's quite exciting actually the council are like you should have some signs to tell people to slow down So I called the AA and I was like do some signs for us and they were like sure And and and it was like the easiest supplier I had to deal with and they didn't even charge us very much So I hope people found them helpful. We didn't really need or I don't think we needed all of them but but they seem to work pretty well and Then the day before we came on site somebody delivered the bins Which was kind of them, but they put them where we were going to put our initial logistics area So we then had to move about I don't know 10 tons worth of bins probably not 10 tons And then they came around a bit later with a bin washing machine, which was which was exciting So it was exciting but now I'm So now I'm going to talk a bit about our power infrastructure, which I've been Perhaps a little bit too much involved in designing this this time because I decided to completely rewrite the software we used to do it That's there's a common theme with EMF like oh, this doesn't work. This doesn't quite work the way we need it to Let's write an including completely new system So we have this computer aided power design system Which which takes our power our main plan, which I showed you before and converts it in works out If if the if the plan is valid and the right things are plugged into the right people The right the right panels and so on the right people. Yeah And and then it spits out love some lovely graphs So this is this is one one-third of our power this year I Can barely see that so I don't know I don't know how well it's coming out on the expensive projector So that shows like every single piece of distribution equipment and the links between them and how much voltage drop and Perspective fault current and all those things that I've been nerdy about for the last six months So we've been trying to get because the emf powered system is entirely done by emf rather than an external company We have to make sure that we do all the testing and validation of it So this is part of that and it tells you whether The cabling is not big enough for various other things and and flags it all out in this huge diagram and Then of course no plan survives contact with the real world. So We we did put our power order in quite late Our supplier template are fantastic. They're actually one of my favorite suppliers and I do have a list of my favorite suppliers and they Were like, oh, yeah, we're gonna have to substitute a few things and and and move these things around We don't quite have enough of these and we don't quite have enough of those and and then we ended up with this mess So we had oh That's clipped it should say 119 power distribution distribution boards of more than 16 amp Five that more than 5,200 meters of power cable three generators two of which were 300 kba and one was 200 kba So that's 800 kba or about 800 watts of power capacity of which we had 130 kilowatts total peak loads like we didn't need those big generators and in fact we didn't order them They were like, sorry, you'll just have to have these vast 300 kba generators Somebody went round just now and counted counted all of the people plugged in and And apparently there's more than 400. I didn't I didn't verify that number So this is this is the main supply of one of the generators. That's the one up there and we have these juicy 400 amp cables going going away from those and That's a container full of all the power distribution that we have several tons of it and We did a bit of aerial power rigging with some very heavy cable which was It worked a little bit wobbly. It didn't fall down. Which is good and Yeah, there's there's there's a small sample of the 400 connections plugged in and a fire extinguisher because safety first So in EMF 2016 We had a bit of a problem that we didn't tell you about Over the weekend we realized that we were getting really close to the wire with fuel and So we had to get Benny under this telehandler and get him to unscrew the fuel drain plug and Siphoned the fuel out of this telehandler into the generator so this This time we didn't want to do that So we got we got some bigger fuel tanks much bigger fuel tanks and they all arrived and they dropped them off and then they were like, oh, yeah, we've just got to pick these up from another site and They're all empty. So it was his last Tuesday They just turned up with all this this equipment and they're like, oh the generators are empty So we had to find somewhere to buy seven thousand six thousand liters of diesel Which is quite a lot of diesel. It's about five grand's worth and They couldn't come until Until Friday actually they came and so we had to get a template to chuck us over another fuel tank to kind of make do That's that's what an empty fuel tank looks like in case you hadn't seen one before That's what an empty fuel tank in generator internal fuel tank looks like on the on the left and Yeah, we're putting the lighting in was a bit of a challenge this time it turns out this particular site is very very hard and Usually we put these bits of metal in called put logs which hold the festoon poles up We had way more festoon that we could have put up but We could we didn't because we couldn't get these things into the ground and we kept bending them or just didn't work Or the telehandler would tip over or something like that But we got I don't know if one kilometer is the amount of installed lighting But for the first time we used LEDs rather than incandescent bulbs which saves a lot of power and it's also Makes let you wire them in the longest strings. So that's why they all look cool white We did a bit of sight lighting finally. Thankfully last last last year I would lost emfi volunteered myself to try and do some of this But I was way too busy and we got a load of lights out and then some art net problem happened and never worked But now we have an actual site lighting team and they've been doing some pretty stuff and next time it will be even more pretty That's a guarantee They're using these off the shelf ethernet to art net to DMX nodes and a load of DMX cable and and the laptop This this presentation has been reordered since I last looked at it, which was eight minutes ago or something This somehow got found somewhere. I'm not sure what was going on there. Did they try and stick it in the socket? It was in the socket. I'm informed So don't do that like they're not compatible And I know I'm going to leave you with David Yes, so hello again. I'm David C from the knock team and I'm going to talk to you first about the uplink Some of you who've been to EMF before will recall the first few events We were running wireless point-to-point links and every time we ran one we swore we're not going to do that again Unfortunately this time it wasn't even an option because you may have noticed that there are many hills around here Which would make it basically impossible even if we had somewhere useful to go to which we didn't because we're quite far out here So planning for this actually began around about the time that we first came to visit the site and investigate in August last year And we quickly realized that we're going to have to get a circuit from a commercial provider somewhere out of the site But what we wanted to do was make it really easy for the supplier to put it in so we built a cabinet right by the road Runducting for them right to the road. So all they'd have to do was In theory was connect up their duct to our ducts pull some five or three with the rope that we've Provided so we were here in January digging in some very hard ground getting trenching in for the ducts to the road power to the cabinet Some sheep were in the field this field there was not actually a camping field at that time of year So by popular requests someone keeps tweeting EMF webcam asking for sheep. Here are some sheep The and this is in fact a deer park we saw deer in the adjacent fit in the adjacent field as well We were careful not to interfere with them So this is what we ended up with. This is how we left it and Here's how it we returned to it full of covered in weeds later Well a couple weeks ago in good condition in the meantime the provider had come hooked up the ducts and Excuse me, here's an example of just outside that cabinet. In fact, you can see branching off to the left are Two ducts for circuit providers one we used one is in reserve for future use The duct going off to the right, which was hastily added a last week. In fact with some PVC bonding cement and Getto homemade swept tees actually comes all the way up here to site because what we discovered using the documentation fairly illegible documentation Provided by the site, but actually walking through and actually looking at manholes and seeing where things got went is that We would in theory be able to pull fiber all the way up to the site backup plan Same as usual throw fiber in a hedge run it down the ditch throw it away afterwards So here we are. This is about 1.2 kilometers of fiber. We rotted Last Sunday seems like a month ago We the manholes are every 100 to 150 meters sometimes a bit shorter But for each one we push this yellow very stiff rod through pull back a rope and then pull the rope back through again All the way this on the right here is is the main fiber a cause just in case something goes wrong And apparently we energize team synergy to assemble an enterprise grades fiber spool unspoiling solution. There we go and Yes, this was splicing in the back of a van down by the main gate to hook that in Here is our network operation center, which we got running fairly early It was the staging point and the distribution point for taking the switches sending them around the field with the access points To be installed in the dart and clove And as for our data center well, we've tried a few things over the year in 2012 We had rented scout tents with a full 19 inch rack which worked pretty well Except it was hard to cool and kept getting bits of field in all the equipment 2014 we had a refrigerated shipping container a reefer which was great It was so cold the problem was it was too cold You couldn't set the set point high enough to stop it constantly chilling and because the door was opening frequently people going in And out it produced a load of condensation There was blown over all the switches and servers which had to be covered in tarp. So cold, but side effects 2016 we went for what the bar is which is a Cool room basically We didn't realize at the time that the inbuilt chiller unit was mostly designed for keeping already cold things cold So food drinks rather than actually cooling enormous amounts of thermal output from switches and servers So we did actually have to buy aircon at the last minute, but other than that it worked really well So that's what we use this year. This is the assembly of the cool room The cloud services data center the the former location of the Inadequate cooling unit has been replaced by a fiber and copper entry port And this is what it looks like inside heavy stuff on the bottom UPS is very heavy and the servers and then from left to right we have the wireless LAN controllers and Some of the Vox video teams servers In the middle we have at the bottom We have the core switch where every fiber around site is plugged in But we'll get to that in a moment And on the right are those fibers Yes, you may have noticed that there is no flat on this field So Bodges had to be involved in certain points to stop the air conditioning tipping over onto the surface Now the knock DC was actually positioned where it is because we wanted to use the manhole that runs all the way Or the duct from the manhole that runs all the way down to the front gate So unlike previous years, we only had one power feed in previous years We've had feeds from two different generators, but this time we didn't but everything worked fine We had a resilient pair of UPS is and an automatic transfer switch for the servers that couldn't take Dual power supplies and we had no outages at all and I'll hand over to Niels Thank you I'm Niels and I'll talk a bit about actual stuff out in the fields This diagram comes from the same Cat system as was used for power distribution Lots of shared development there Purple lines are the fiber that goes across the field So from central places to all the data close the circles are roughly 50 meter diameter circles Around these data cloud being 25 meters kind of a rule of thumb You don't can't really expect people to bring longer cables than that so data close spaced out on the fields so that circles just almost overlap and If you pay attention to where the purple lines go here, you will have noticed that these are all little islands and One of the big features of this field is that there are there's infrastructure between several places that we could use to transport data Where we didn't have to cross roads because road crossings are really annoying to do There's lots of traffic always and and vans and stuff So can't put fibers there you have to work with ramps which are expensive and heavy and This way with with lots of course From between three places on the field Save there's a lot of hassle in in deploying a working infrastructure here So this is the duct plan. There were three manholes and We we had up to 12 cores between different places basically these these little LED signs are splice boxes with a watertight cover over them and at each side we would break out a couple fibers and The rest would go on so from from the core We had a star network from the core We could patch everything all the way through to the end of the field without having to have any active equipment all over the place Where right So this is how the the network plan looked. This is the logical diagram as you can see everything is connected To the the core switch to the core router e-snore I'm assuming a non-native English speaker wrote that down after hearing a British person say it and The couple places where we didn't want to run fiber because there were really short distances And we we had a you know 10 meters of copper cable and and that is the bottom layer you see in this diagram Yeah, it's sideways, but you know landscape and This is the physical diagram, which you can see is different and These are not switches, but these are the the datum close all over the field so For example, you can go from the left to the right in this diagram and follow the cable From one datum flow to another all across the field with no active equipment in between except where it says copper So again, this is coming from a single source of truth, which is really helpful when when yeah troubleshooting problems and Making sure that everybody knows what actually is the network design that is being rolled out what fielands need to be aware and Just finding out what is where this is one of those splice boxes That we had a couple of through the field On on the right side you see the black Multicore fibers outdoor fibers that run underneath the ground come in then they're spliced onto pigtails in the the white bit with the laser warning and These end up on on pigtails that are then put into connectors on left and all those cables go to the switches The connector on the right is the uplink connects on the left or go to the field there's two cables coming into this and then we had two more of these out in the field and When the event is over we roll up all the cabling inside and put the top over it again and Put it back in the trench and then I don't know maybe in two years We can come back and we don't have to do all this place work That Dave showed all the photos from the datum flow for for people who's who was for who this was the first EMF Originally, I think invented by the Germans copying a concept from the Dutch We lock them because we don't want people to mistake them for what they actually are normally This you can see there's power going into it there's fire extinguisher next to it because it's a nice Central place where you can have them The the little woods tower on top has an access point in a container box upside down And on top of that is an omelight and you will have seen those display fire They're very good for useful because if you're walking around the field you can immediately know Oh, there's the nearest network access point and you can run your cables there and Shoot it loose Internet connection then the fire flame animation will stop and you immediately know. Oh, there's an outage there That will need attention This is from the inside Cables coming in on the bottom one going out to the access point and To the omelight. There's a switch in there. There's a the power distribution unit there and This one I think I took this picture on like Friday afternoon. So not many people around who had plugged into this one yet I Don't think we ever ran into a situation this event where we needed to add a second switch Because we had needed more than the 48 ports So a couple of these ports are of course reserved for our own stuff like the omelight needs a connection The the decked phones need a connection gsm base stations and the access points We had some power reading at switches. Most of the access points were connected via be we injectors But this was be we switch I think Right stuff that went wrong One of the the challenges is you start out and you build you arrive on site And you build out this little temporary network just because you know, we need to be online and the orgas breathing down Your neck going can we check our email yet and everything we need this for production? So you build something temporary and then as the event starts you need to move from the temporary setup to the final setup We had one little device in one of those cabinets that we had built Up the road To serve as a media converter and then we had to take it out and whenever we took it out the normal equipment couldn't take over because The traffic just wasn't accepted at the remote end. So this was a link that had three different suppliers involved so we had to Contact them all have them all debug their little part of it and then eventually it turned out there was Probably some display bug in the switch on the remote and in London that was dropping all the traffic Without actually Indicating that it was all the traffic. So this is why in practice for for you to notice IPv6 to until I think the afternoon of day one before IPv6 would work because we needed the new final equipment there Something else we worked for like two hours on getting the switch online via copper uplink And we changed everything and like the cabling re-crimped it and then finally we're like, okay Let's not use the copper SFPs This particular switch says 10 gig ports and we put one gig Plugables in there and normally that works. These are multi-rate slots But after we took them out You can see that the lights the green lights on the bottom row that are lit up are the link lights So this switch currently thinks that these ports have a working link, which is obviously not the case Since the plugables are lying on top of it. So yeah, two hours of re-crimping cables Drawing in crafts is a hobby that certain people took up where if you have a public craft Then you know it goes up and down as today progresses but if you have significantly more capacity available then you have usage and You have a place where you can send a lot of traffic from you can create a nice spike And it goes up and then you stop sending traffic. It goes down and it's so fine and dandy until You don't have much capacity available and you DDoS the campsite that way, which is what happened here We only had a gigabit. It was enough for everything we did here for all the traffic that the people did for all the streams to go out and all that but it just didn't really have much capacity to to catch incoming DDoS attacks so the knock had to spend time and effort contacting our upstreams having identifying source destination and we ended up having to take the public dashboard offline from from being able to be accessed from the world because that was the target of the DDoS attack and the source was somewhere in a Group in Germany who deal with open Wi-Fi network development so to speak so yeah, please don't do that. It is annoying and It inconveniences everybody on the on the site and Creates work for a knock and finally is this wiring that you guys have here Luckily somebody brought stickers to notify us of the problem Which were widely deployed and I think these were good safety measures This isn't my first visit to the UK and I know that you guys like warning signs and safety signage and everything so the the European mainland Federation was was Glad to help out Of course, you're being Europe. We we also proposed a solution That we we will help you implement two years from now. Thank you very much Yes, this is the problem with having a Presentation that you need many teams to work on simultaneously and opening it up someone will put in a troll slide. Thank you Oh Wi-Fi, so I'll hand over now to AK who's gonna talk about the Wi-Fi distribution through the camp and some give you some stats so Wi-Fi Well, it's about Putting up lots of access points. I guess this slide didn't come in too well. Okay Okay, so some of the photos are not On here worse that are supposed to be on here But yeah, we put up a lot of access points around Around 70 of them on the left you see a few of them when they're being staged when we were back in the Netherlands on the left you See an access point mounted to a fence and on the right you see the access points we have mounted on all the all the data and close so that's actually an Indoor access point that's mounted into a plastic box. That's used for waterproofing it. So that's a fairly cheap solution to use a cheaper indoor access point and making it waterproof And on the top here you see also the GSM antenna and one of the art net home lights And there was supposed to be another photo on the right, but we can't see that Some statistics about the that Wi-Fi deployment here. So we had 72 access points deployed all 8 to 11 AC Aruba access points 2,800 concurrent stations that were concurrently connected to the network and in the course of this four days we've seen around Almost 6,000 unique devices on the Wi-Fi network and actually Most of the devices connected to the network were actually on Wi-Fi about a 94% of them So only 6% of those devices were actually connected to the wired network. So Yeah Yeah, we also had a number of SSIDs Well, most of them were encrypted and some of them were unencrypted but almost 70% of you guys use the encrypted network So that's good and 80% of the stations were on 5 gig I think the badges they cannot do 5 gigahertz. So that maybe they are taking down the percentage of Stations on 5 gigahertz and Of course 5 gigahertz has way more capacity than 2.4 gigahertz We're also Here in the UK they off come opened up a little bit more spectrum. So they added five more 5 gigahertz channels. So we were able to use 24 5 gig channels opposed to four 20 megahertz channels on 2.4. So there's way more Spectrum to play around it on 5 gig. So please use 5 gigahertz and yeah, maybe 2.4 can maybe go away at some point but Yeah, some more statistics in this slide You guys were able to actually use a random username password on the encrypted Wi-Fi, but Apparently not almost none of you Actually tried to do this. So it's EMF and anonymous and Some Adorama Realms that are in this top 10. So not much exciting things going on on the The different operating systems we've seen on the network Linux is a number one. So that's good. So For some reason there's Windows 98 there that cannot be right We also collect a lot of more data about the Wi-Fi network like we can look at how many Clients that are associated to the different access points spread across the site So one thing we can do is we can look at how many clients are in a certain room. So we can use this data to see which Presentations are popular. So we can see that apparently the most popular talks were banned from encrypting and the making of the tilde MK4 And also, yeah hackers was very popular yesterday. So It's good and Cybar was also crowded yesterday Right now and Millie ways was also popular yesterday Something with So that was it for Wi-Fi we have some other statistics Yeah, so we have this one gig uplink and we yeah, it was saturated so Because thanks for that. Yeah, so next year we have to have more bandwidth Or next two years we have got to go for 10 gig or something is Yeah, this is the So we see a couple of peaks there and but that might have not been genuine traffic But yeah, we'll we'll get more I guess next year Yeah, so temperatures Yeah, it was last night it was pretty okay during the night, but The night before that it was very very very cold Sookie you can actually see about a I think it's a 20 degree difference with during the day and during the night So if you're looking at the temperatures of all the switches we have on site, so I think yeah, it's yeah Probably 20 degrees difference between day and night. So that was Pretty cold I think that's it for statistics. So we're gonna move on to video. Yeah Okay Yes, so some of you may have noticed we haven't done our usual thing of having very strange graphs like radiation level or club marté stock in the bar This is mainly due to everyone being absolutely knackered by the time all the logistical Issues were sorted out But now I will pass over to a team far more professional instinct streamlined than our own the ccc video operation center and pass you over to body So hi everybody, I'm Wadi from the city rock, which is the video team of the ccc from Germany Let's start with a few statistics of our live streams, so we had around 100 viewers at the peaks up to 120 most of the people were watching impact dash live streams, which is like an adaptive live stream technology and Apple devices mostly use HLS and some legacy devices watch the ice-cast streams Those are statistics from our ticket tracker. So overall we recorded 117 events 26 events were not recorded. Those were either speakers that didn't want to be recorded or Music and movie events that aren't been being recorded and overall That's almost 62 hours of video being recorded by us and most of the stuff is already online and you can watch it So we also faced some challenges at EMF first those tents arrived late and We had to do everything at Friday morning and it was really stressful, but We got it. So and during the build-up at a stage speed. There were some power outages, which also didn't help For the first time at this event We all normally we render our videos with an intro at the beginning which like a small video Which says who's the speaker and which what name the talk has The guys from EMF wanted it to be like a transparent lower third thing And we had to build it in our pipeline and but at the end it worked out And so now every video starts of a lower third which has been fancy and overlays over the video One talk actually had an emoji in its title, which was a little bit challenging But everything worked expect the automatic intro generation. So I had to fix this manually But a part of that it's already up on YouTube and on our own platform and everything worked And actually on this stage one hdmi splitter was pricked by a tesla coil and so On this stage we have some problems with like the video on the projector, but I think it's working now So thanks for the appreciation and we also really like this big lucky cat And you can find all the recordings up to now and some are missing at media.ccc.de and on YouTube. Thank you So many of you will already know for the first time at EMF we have a deck network that has been very well received this was put together by The event phone team who are testing out their new system here. Unfortunately, they have had to leave early They've kindly left their equipment in our care But Sam will be talking on their behalf and he's also going to talk about the GSM network that he built So yes, my name is Sam. I've been involved in building the phone network mostly the GSM But the kind of as we'll show you we had like a common core So I worked really closely with Thomas and the deck the event phone guys with the deck stuff This is Thomas's presentation. I've seen once so this is kind of risky. I don't know. We might have slipped in there So first thing really we as you see one of the big things that event phone put in this year was Self-service for deck registration those who have been to Congress before you know Like signing up waiting to get your deck phone online had to be kind of a fairly manual process one but one registration at a time So they put a lot of work into building a service the way you could just Register so the deck antennas were effectively always in registration mode So you could just pick up your phone and say Register to network and the default pin that kind of gave you a temporary allocation on the network with a really long number that wouldn't root anywhere and then you could register your number in guru and Just dial the activation code which actually then like Re-provisioned your phone. So that was I think I was quite a lot of work. I think it's worked really well for them I think most people found that was that was fairly good It also meant that that number registration guru system we built was not just for deck But actually we extended it to cope with the same for GSM and well for sip So you could just sip register a phone So I've been using my iPhone with just an application on it all weekend I'm actually even got my decked phone out the box But you actually had like three different ways to access the same phone system And you could have a number on any of them and you can have call groups and that kind of thing So so yeah, that's that's what you do. Well the kind of principles we could apply then from decks to GSM Uniform so it kind of unified experience across the networks really we have one phone system different access channels things that they've learned for EMF The capture those of you that signed up very early on in guru I think found the capture significantly challenging either that or everybody was a robot, but So there was a little bit of a yeah, we'll turn down the aggressiveness on the capture Displaying sip details. It's mostly being kind of UX type things in like in any web application They added call groups as well I don't know if anybody found that but if you had like you could get a number that would ring multiple extensions So if you wanted like a number for your village that would ring six people's decked and GSM phones in the village You could register that as well. That was kind of a late addition So this is kind of what the the IP architecture looks like So we ran The in terms of hardware all these servers were running on the ends that David kindly provided for us So we had these built up a little bit ahead of time and then moved to site So there was a yate, which is a yet another telephony engine. You might be familiar with as a sip Sip control platform. So there's a number of yate instances Which was kind of handling each segment of the network for for the voice of the deck stuff gets converted into sip as well As does the GSM as I'll show you over there So we had a kind of a VoIP core server Then we had the decked antennas you'll see on that cloud So they were running as a private VLAN across the site So all the decked antennas were plugged into a specific switch port on on the VLAN And then the GSM BTS is over on the right there similar principle to the decked antennas We actually So the the hardware for those of you haven't seen some of the other presentations the GSM Base station is a Raspberry Pi and an SDR radio. So we have a Raspberry Pi We have a you know a dev a Raspberry nrs on there. We could just run an open VPN So the BTS itself just plugs in fires up an open VPN tunnel back into our VoIP core And then runs the the GSM over there What was really nice was it meant that actually I have I've had one of these base stations plugged in at home on my DSL what I've been doing testing via the same VPN So we can actually deploy a base station anywhere in theory with that that technology And we didn't have to kind of rely on a custom VLAN for that Just some management stuff over on the outside and then you'll see the little logo over there So quick plug for my employer next mo who kindly gave us a bunch of credit to makes all the external calls traffic out So the the PSTN was routed out through them We had the two little GSM servers at the top there the GSM core is the osmocom Core network in a box stack so that was providing our for those you know the GSM Acronyms the MSC the BSC and the HLR and the SMSC were all running in in one on that box And that just turned has a sip interconnect so that came out of a sip that way And then the GSM services was just an asterisk box for doing a few little hacks and tweaks And we put a few little services on there and test numbers and generally it just gave me a box to do some manipulation We also do the outbound traffic to next mo through that and the inbound for those of you that found the inbound There was a UK number you could dial It would just give you dial tone So from your regular mobile and then you could do anything as if you were on site So you could dial people from off site could call 07 520 660 900 and you'll just get dial tone So this was what was on the network. We don't know exactly how many GSM devices attached to the network We know we had 1900 GSM enabled devices at some point, but we didn't have great stats on on the traffic on there That could have been literally just one location update or phones attempting to location update So people's phones that may have tried to register and be barred or something like that 277 decked phones 70 sip extensions and 33 people signed up for a personal sip number personal GSM number. So with the sims we gave you in the badges We used the similar thing to decked, but actually you finally all had a number, which was that for one two three four number You could you keep that number and just use it, which is what people that got their GSM working did But equally you could have like reassigned it yourself for a personal number as well So the active calls going out to the to the real world We have this little problem as you can see here on I think it was well started at just after 4 a.m On Friday morning is that through till sometimes 12 o'clock Basically somebody hooked up one of their sip extensions to their sip server rather than to a phone Their sip server wasn't a particularly well protected server So somebody out on the internet and anyone so put a sip server on the internet will know It takes about 20 minutes before somebody starts trying to poke you with call attempts They poked their server they found oh look it can make outbound calls via our server and that burnt through about a thousand euros of credit Calling Serbia So I had to have an awkward conversation with my boss then on Saturday morning going that thousand euros of credit you gave me for EMF. Um, I've kind of lost it Can I have some more please but fortunately he did I just checked the balance and actually since we locked that connection down And we put a few limits we blocked sip for outbound calls, but from decks and GSM We've actually only used 60 euros of credit Of legitimate calls. So we're outbound and inbound. So yeah, that was definitely some forward there. We did only allow UK Europe and US prefixes anyway, which should have generally blocked out the obvious for definite destinations I kind of missed maybe Serbia that will go in my band list for next one And this is one quite interesting little thing from the deck network So the decked base stations all need to synchronize with each other because it's a time division multiple access system So all the base stations need to be on a synchronized clock We don't have this on GSM, which is why we don't have handover right now What the decked system can do is they synchronize over our ref links between them So all these lines are you'll see the spots are where all the decked antennas are so you can even see the one right Down at the gate. So there's one in the DK at the gate there and they actually discover each other And even a red link is a low quality Media red yellow green quality links, but these would all keep them in synchronization So they're synchronizing over the decked RF band with their with their channels Couple of plugs. Yep. The challenge for event phone is they're trying to get more followers on Twitter and YouTube So they're clearly trying to break into social media Very quickly the GSM stuff Challenges we had the time frame getting all built really I was being pushed You know, we were right up against it and we were reliant on so many other bits of infrastructure So so we got pushed out there deploying the BTS is in the real world We all the stuff worked really well on in the test in the lab online SDR built the boxes and I've had stuff running on my desk at home for weeks Turns out when you start sticking it on a wooden pole in a field some of the environmental things So Thursday night, I think it was was furiously spent soldering additional five volt power lines raspy pies USB power anybody that's been there will will know that and yeah man power woman power I really kind of ended up doing nearly all most of the GSM stuff myself with a bit of help from Thomas a big shout to Yaga if she's here who helped putting up the base stations on Thursday And then we ran and took them all down when I said actually what I thought was a software problem Is a hardware problem and I need to solder some wires into them So can you kind of get them all down again and bring the back, please and then put them all back up again? Again, so yeah, she she does Yeah, so we can see we can see whether GSM was busy surprise surprise Not many people are making GSM calls at four in the morning, but you know, there's a traffic distribution graph there So a DMF we're always trying to keep the ticket prices as low as possible in order to Encourage and then make it available to as many people as possible And we have to always balance that versus things that we actually need like it or people expect like an internet connection paying for an internet connection and Equipment and set up about the size of a small ISP that is used for a weekend and then thrown away for two years Isn't really something we can afford Nor would we actually want to so we rely on the enormous generosity of a whole slew of sponsors to lend us equipment services and other Another favours I'd like to give a particular shout out this year to sky for business who without whom we'd have no uplink at all uplink Goes via a circuit to a nearby town where they have a point of presence and they take it to London from for us We had very few options there and they were awesome Absolutely many thanks to them and I'd also like to thank the others So I'm just going to read out very quickly because we're out of time a vent in for a flex optics Sargasso networks Lonap Comtec clarinet babu and Arista, so many thanks to them I also want to thank the volunteers who pop by from time to time offering to run around the deep the dart and clothe Plug people in we need your help again to unplug them And beginning tomorrow at 9 a.m. We begin teardown That's bringing back all the cables all the fibers all the switches if you're able to help out Please come by at 9 at the nocturnes. I think that's it these slides will be on our GitHub and Here's our Twitter