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Great guess, that was indeed my problem, thanks!

After boot-up my /etc/resolv.conf looks like this:

Code Select Expand

nameserver 192.168.1.1

First of all, the domain is not there and no other namservers from Sytem->Settings->General are listed.
Secondly, 192.168.1.1 is my previously used LAN ip, currently I use a 10.x.x.x/24 net for the LAN - so I have no idea where this old IP comes from.

If I run 'ifconfig [WAN device]' down/up or 'confligctl interface reconfigure WAN' then the /etc/resolv.conf looks like I expect:

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domain my.local.domain
nameserver 127.0.0.1
nameserver [DNS servers]
nameserver [configured in]
nameserver [Sytem->Settings->General]
...

The Unbound DNS for LAN clients works fine regardless, the only issue I found with the faulty resolv.conf is that checking for firmware/plugin updates is not working.

Is this perhaps a misconfiguration from my part or actually an OPNSense issue?

Thank you in advance.