Hello! I (tried, at least) converted an old laptop to a Debian home server, and I was trying to set up duckdns.org and to enable port forwarding on my router. internet connection was working, I installed packages, docker, immich, etc, and then suddenly (I don't know exactly when) it refuses to connect to the internet. It does connect to local addresses (I can ssh into it) but ping google.com and any other internet-involving command fail. I had set up a rule on the router to forward port 80 to the device's port 80, but I then removed the rule and it still does not connect to the internet. I rebooted the router but nothing changed. Any idea what could be? the router is a Vodafone router.
I changed the hostname to debianserver but on the router it is still written debian. Also, it's the only device with unknown ipv6
thanks in advance!
EDIT: I rebooted again the server, and now ipv6 is not unknown anymore, and the hostname is correct. however, it still does not connect to the internet
EDIT 2:
only one device (debianserver) has this problem, other devices work as before
EDIT 3:
I don't know if it's useful or not, but if I boot a live debian USB in the server internet works
~~SOLUTION:~~ aaaaand no it does not work, after restarting docker it seems to work because all the brodges are yet to be created and it takes some time, after like 30 seconds it does not work as before :(
- edit the file
/lib/systemd/system/docker.service - append the flag
--bip=192.168.3.1/24toExecStart=.... systemctl daemon-reloadsystemctl restart docker
docker was the fucker that messed everything up and made me lose a few hours!
EDIT 4:
it seems that ip route flush 0/0 restores the internet connectivity until reboot... I don't know what does this means but can be a temporary workaround I guess? I really have no idea how to solve this
FINAL EDIT: I gave up. I removed debian and installed fedora, and now it all works like a charm
really really thanks for the help!
Please try
wget https://104.18.114.97, if this one goes through I'd think the problem could be related to a faulty forwarding of regular internet traffic (port 80). If that fails as well I'd guess it's to due with the DHCP/Static IP's and involves your router. I'm absolutely clueless about Vodafone routers though.Edit: Any connection would show "The certificate's owner does not match hostname ‘104.18.114.97’"
sorry I don't think I understand, where should this be written?
Here I've tried
wget https://104.18.114.97. It's able to connect to the IP on port 443, but shows an error message since I'm not using a domain name. But at least I know I've reached the server.so this means that the problem is actually the server? or do I misunderstand?