ISP connection regularly falls off - how to troubleshoot? reddit / selfhosted ---------------------------------------------------------------------- ThrowAllTheSparks · 2023-11-21 02:55 Hi all, As I get further into self-hosting one thing I've noticed is that my internet connection disappears for 5-15 seconds and sometimes for a few minutes at a time. At first I thought it might be my wireless access point so I upgraded that and also wired in a few devices but the drop-offs continued. At this point I can't tell if maybe my OpenWrt router ([FriendlyELEC NanoPi R6S](https://wiki.friendlyelec.com/wiki/index.php/NanoPi_R6S)), Arris DOCSIS 3.1 cable modem, or the ISP itself is the problem which leads to the overall question: has anyone had similar problems and how did you track down the source? I dug into my router's logs today and I can't say anything stood out, and also can't say I know what I'm looking for either. Anyway, any help would be appreciated! ---------------------------------------------------------------------- thekrautboy · 2023-11-21 03:05 Try /r/HomeNetworking instead. ---------------------------------------------------------------------- s3r3ng · 2023-11-21 03:29 I note that on Comcast\[ic\] anything less than a business class contract is periodically falling apart or being throttled. ---------------------------------------------------------------------- Senkyou · 2023-11-21 04:40 I used to work in a NOC for an ISP before moving to business IT. You want to approach this like you approach any troubleshooting: chunk it up. Establish a path from your end device to the internet. I typically use 1.1.1.1 because it's easy to type quickly. You want to set up monitoring to each hop to see what fails and what doesn't. In other words, set up a ping from your desktop to your router's internal IP (192.168.1.1, for example). Then a ping to your public address, if it responds. Even if it doesn't, you can ping your public gateway and that'll essentially be the same thing. Then ping your DNS server (Comcast rolls their own). Then ping 1.1.1.1 or whatever you want. By seeing which one fails, you can determine exactly which device or hop is causing the issue, or at least which pair of devices the issue could be in. Once you know that you just get more and more specific until you've found it. ---------------------------------------------------------------------- ThrowAllTheSparks · 2023-11-21 05:04 Thank you I didn't know about that subreddit and agree it's a better fit.