[Wireguard] Name does not resolve - only on reboot

[andre_x]

I've setup a Wireguard VPN that works.
Today we had 2 blackout and both the time the VPN didn't connect automatically to the endpoint.
I've checked and in the logs I see

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Name does not resolve. If i disable and enable back the endpoint, it works.
So it seems that after Opnsense restarts it's not able to resolve a public DNS and WG doesn't retry.
How can I solve this problem?
Thanks!

[franco]

Make DNS more reliable? It appears to be querying a server that isn't able to resolve yet...


Cheers,
Franco

[andre_x]

Probably the Internet connection isn't up yet (the vDSL modem is slow).
Why WG doesn't retry?

[franco]

The internet connection is up in the post-connect hook (newwanip), but the DNS server it's going to query is not. No idea where and how you resolve DNS but usually that's an issue when you try to query an internal server for an external answer right at the moment the edge device got the connectivity, which means the internal server may not have it yet.

This doesn't happen when you have DNS resolution going through localhost out to the Internet.

Case in point: https://github.com/opnsense/plugins/issues/3186#issuecomment-1905263283


Cheers,
Franco

[andre_x]

Well...I've just realized that I didn't setup any DNS  :| OPS!
Thanks!

[franco]

There's no way it was DNS :D


Cheers,
Franco