Need help with my routing
reddit / selfhosted

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PMFRTT · 2023-10-04 20:20

Hey there Reddit,
I've had a power-outage today and afterwards, my internet was down.
After troubleshooting for many hours, I discovered my default-route
wasn't working correctly. I've tried everything to no avail, so now
I'm turning to you.

My default route is the following:
0.0.0.0/0 via 192.168.178.1
The gateway is reachable from all clients on the network. Pinging
8.8.8.8 does not work and I do not see traffic going over the
interface using tcpdump.

Out of curiosity I created the following route:
8.8.8.8/32 via 192.168.178.1
Same gateway and all of a sudden, the address 8.8.8.8 (but only this
one) is reachable.

As a workaround, I now have these 2 routes:
0.0.0.0/1 via 192.168.178.1
128.0.0.0/1 via 192.168.178.1
This seems to work for now but is not ideal.

My "router" is running on Ubuntu 23.04 and has been stable for over a
year until now.

Does anyone have an idea, why my default route does not work? Any help
is appreciated!