 Hi there, welcome back to my YouTube channel. This is Daniel Rosal here. So I wanted to demonstrate how a 4g cellular router that's being used as a backup handles the backup the backup process And how well it actually works. It's pretty pretty cool If you're into home networking and that kind of that kind of thing So I demonstrated in a video earlier today how to set it up Now let me just sort of recap give a quick quick recap on what I'm doing. So basically I purchased a Data-only SIM card for 4g then I bought a 4g cellular router. I'm using the TP-Link MR100 It's a pretty basic router cellular router with one LAN port and one WAN port then I took my ISPs router, which we're shortly to see and I went from the LAN port there into the WAN port the wide area network port on the cellular router Now what that is doing is effectively passing on the internet connectivity from the ISP connection onto cellular So really all the ISP network, which is the one behind me here is doing is passing on connectivity into the cellular router Now the cellular router has a 4g has a SIM card in it Which is where I put my cellular SIM card and it can handle Automatically backing up to that cellular connection if the ISP router fails Now it's not exactly that simple. There were a few settings. I had to change but it honestly Once I figured out what I needed to do it literally took about five minutes to apply those settings Then I just needed to spend the next hour or two playing around with ethernet cable to figure out the best way to Have those two boxes in my house and I ultimately decided to put the 4g network outside Now Final thing I did was took down the Wi-Fi network from the router here and Put up a Wi-Fi network on the 4g router and that's because that 4g cellular router now has the ISP Bandwidth coming into it that's coming running from this router into it and It's got that failover backup connectivity so there's really no point in Running a Wi-Fi network that doesn't have the two connections when you can have one that does so in the interests of not running a bunch of different Wi-Fi networks, I took down the one on the ISP box and the one running now is on the 4g router which is in the room behind me here and I also ran an ethernet switch out of that 4g router and That's providing wired connectivity to everything including this computer. So there's actually one cable coming out of this room to bring out the ISP connection and one cable coming back in from the other router to return the connection with the two Internets spliced together if that makes any sense. So it's pretty cool And the TP-Link system automatically fails so that when it detects that the ISP internet is down It will give you the cellular internet and that that was one more setting change To make sure that it knows that the primary is ISP and the backup is 4g. Let me just show you Do a quick test and a demo of the actual failover process. So let me bring over to you the current internet I'm using so Who is my ISP? Who is my ISP.org? There's a lot of sites like this and I'm just on this awkward cropping because I'm hiding my IP address here You can see I'm currently with partner communications, which is my ISP and if I do the internet speed test I'm going to just refresh the test You can see I'm probably getting something like 40 Ish Megabits per second and that unfortunately is about the best internet I can get in this part of the world Now that's fine, but that internet frequently Stopped working for hours and sometimes even a couple of days at a time. So that's why I sort of did the system so Currently on ISP internet now. Let us do the experiments home networking experiments. So I'm just going to Swap over to I rigged up a camera and Positioned it in front of the ISP writer in my room. That's what you're looking at there and What you can see here, I've just flipped it around so you can see the ports That port on the left the gray port is the Arge is the DSL port. I believe so it's RJ 11 so that's what's bringing an internet and that's port there the white one is what's going out to the Cellular network and then there's power so I was going to just pull out the plug And I thought I'd probably be a bit more respectful to the electronics and just pull out the connectivity so I'm going to now go ahead and do that and once I've done that the ISP router will no longer be receiving connectivity and Therefore no longer passing through the ISP connectivity to the backup cellular router. So let me go ahead and do this Just going to move across to the other side of the office Okay, so as you can see that took all of half a second. I've gone ahead and plugged out the I believe it's DSL. I may be mistaken, but I'm pretty sure that's what that is It's the internet connection going into the ISP router and Now I'm going to go back to who is my ISP refresh that and it should pick up that we failed over Straight away. So let me actually do this right now. So it's been about what 10 seconds since Since I pulled out that that that cable Let me just go over now. Who is my ISP do a refresh So there may be a bit of a lag failover is not a perfect perfect science Well, what should be happening is that there's there's no connectivity in the ISP router. Therefore, there's no connectivity going out through it and Oh, that was not good Let us see could be something like a minute I'm just gonna see if I can even do the internet speed test again, or if it's saying that everything is totally down here Okay, so I just pause the video for about 10 seconds now. It was not instance in total I have single single offline detection mode is what I have it set to and it wasn't it was not instant, but it took about 30 seconds and It did happen fully automatically, which is I guess the main point, right? So now it's saying X phone 018 is my ISP and that is we 4g is basically a brand of X phone and that's the 4g SIM card I'm using now if I go into this website Internet speed test. I'll just do a refresh now that the connectivity is picked back up and you're probably seeing much much slower speeds and Generally speaking it seems like the internet is struggling to operate But one sec So I'm just gonna do a refresh on this page and we'll see what results we get Okay, so we're now measuring and yeah, it looks like really really really slow connectivity. So that backup connection is generally Not very impressive to say the least. It's like less than one megabyte But I just typed in does the internet work just to verify that there is some connectivity So clearly given the fact that the ISPs router or you know networking has been pulled out This has to be there's no other explanation Other than that, it's coming from the cellular. It's coming from the 4g SIM cards so that is That is basically the test of failover so in conclusion Well, I guess what I demonstrated or figured out was that the failover process wouldn't say it was instant The backup connection is not that good to be frank but at least it works and it worked automatically and If I go ahead now and put back in the connection to the ISP router it will switch back over automatically as well Hope this video was useful if you'd like to get more videos from me on Technology Linux home networking and other subjects that I am interested in and so are other people of this of Interesting these things then feel free to subscribe