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What is your contingency for when the ISP goes down?
(ttrpg.network)
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this post was submitted on 19 Sep 2023
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First off. If Internet goes down I have a http captive portal that do some diagnos, showing where the problem is. Link on network interface, gateway reachable, dns working and dhcp lease. Second, now when it is down, show the timestamp when it went down. Third, phone number to the ISP and city fiber network owner.
Forth. Watch my local RSS feed and email folder. Also have something to watch from Youtube or Twitch game downloaded locally.
Can I get more details on this captive portal? How does it diagnose network issues or what software are you using for the captive portal?
I use very simple software for this. My firewall can use route monitoring and failover and use policy based routing. I just send all traffic to another machine with the diagnosis part. It does ping through the firewall and fetch some info from the firewall. The page itself is not pretty but say what is wrong. Enough for parents to read what error. I also send DNS traffic to a special DNS server that responds with the same static ip address - enough for the browser to continue with a HTTP GET that the firewall will send forward to my landing page. It is sad that I don't have any more problems since I changed ISP.
Had a scenario when the page said gateway reachable but nothing more. ISP issue. DHCP lease slowly ran out. There were a fiber cut between our town and the next. Not much I could do about it. Just configured the IP static and could reach some friends through IRC in the same city so we could talk about it.
The webpage itself was written in php that read icmp logs and showed the relevants logs of up and down. Very simple.