On Sun, 2025-03-02 at 20:38 +0100, Patrick Dupre via users wrote:
> Trying to add a nameserver.
>
> On PC B, I have
> Global
> Protocols: LLMNR=resolve -mDNS -DNSOverTLS DNSSEC=no/unsupported
> resolv.conf mode: stub
>
> Link 2 (enp3s0)
> Current Scopes: LLMNR/IPv4 LLMNR/IPv6
> Protocols: -DefaultRoute LLMNR=resolve -mDNS -DNSOverTLS DNSSEC=no/unsupported
>
> Link 3 (wlp2s0)
> Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
> Protocols: +DefaultRoute LLMNR=resolve -mDNS -DNSOverTLS DNSSEC=no/unsupported
> Current DNS Server: 192.168.43.1
> DNS Servers: 192.168.43.1
>
> On PC A
>
> Global
> Protocols: LLMNR=resolve -mDNS -DNSOverTLS DNSSEC=no/unsupported
> resolv.conf mode: stub
>
> Link 2 (enp1s0)
> Current Scopes: LLMNR/IPv4 LLMNR/IPv6
> Protocols: -DefaultRoute LLMNR=resolve -mDNS -DNSOverTLS DNSSEC=no/unsupported
>
> Link 3 (enp2s0)
> Current Scopes: LLMNR/IPv4 LLMNR/IPv6
> Protocols: -DefaultRoute LLMNR=resolve -mDNS -DNSOverTLS DNSSEC=no/unsupported
>
> Link 4 (virbr0)
> Current Scopes: none
> Protocols: -DefaultRoute LLMNR=resolve -mDNS -DNSOverTLS DNSSEC=no/unsupported
>
> What should I set on this PC A?
>
> resolvectl dns enps2s0 192.168.43.1
> systemctl restart systemd-resolved
With what we're presuming to be your network topology, and the usual
way things are done when sharing an internet connection, and presuming
you just want a DNS server that lets everyone surf the internet rather
than be a resolver of local addresses:
WiFi mobile
192.168.43.1
|
|
192.168.43.115
PC B (acting as a gateway)
10.42.0.1
|
|
10.42.0.5
PC A
B should be using the 192.168.43.1 device as its DNS server, and A
should be using B (10.42.0.1) as its DNS server. B should be behaving
like some kind of forwarder for the name resolution requests (either
acting as a kind of proxy, answering them itself, or just redirecting
IP packets through to the mobile device and using it as the DNS
server).
And it might be worth having a look at this:
https://fedoramagazine.org/internet-connection-sharing-networkmanager/
It's a bit old, but might say something helpful.
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