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Re: 11.2 sometimes wrong /etc/resolv.conf

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On Thu, 10 Mar 2022 17:22:34 +0100
Christian Groessler <chris@groessler.org> wrote:

> when I boot my laptop with Debian 11.2 and LAN cable connected, I'm 
> sometimes getting a wrong /etc/resolv.conf.
> 
> The resolv.conf is not in fact wrong, but it's the one from the Wifi 
> network. But when booting with network cable connected I want to have 
> the resolv.conf of the cabled network.
> 
> Can I somehow force this? That the "cabled-network-nameserver" is
> used when the cable is connected?

The cable network's DHCP server should provide the relevant information
automatically. If you are using NetworkManager, you can insert a script
to find out what it provides into /etc/NetworkManager/dispatcher.d/.
Something like:

echo "Routers value is |$DHCP4_ROUTERS|. IP4_GATEWAY is
|$IP4_GATEWAY|." echo "Environment is:" printenv

and send the output to a log file. The variable you want is
DHCP4_DOMAIN_NAME_SERVERS, and possibly others (see the results from
printenv).

You may have to request certain information from a badly configured
server. In your /etc/dhcp/dhclient.conf, something like:

request subnet-mask, broadcast-address, time-offset, routers,
	domain-name, domain-name-servers, domain-search, host-name,
	dhcp6.name-servers, dhcp6.domain-search, dhcp6.fqdn, dhcp6.sntp-servers,
	rfc3442-classless-static-routes, ntp-servers;

You will probably need at least the second and/or third line.

-- 
Does anybody read signatures any more?

https://charlescurley.com
https://charlescurley.com/blog/

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Thread

11.2 sometimes wrong /etc/resolv.conf Christian Groessler <chris@groessler.org> - 2022-03-10 17:40 +0100
  Re: 11.2 sometimes wrong /etc/resolv.conf Charles Curley <charlescurley@charlescurley.com> - 2022-03-10 18:30 +0100
  Re: 11.2 sometimes wrong /etc/resolv.conf ghe2001 <ghe2001@protonmail.com> - 2022-03-10 20:50 +0100
  Re: 11.2 sometimes wrong /etc/resolv.conf Anssi Saari <as@sci.fi> - 2022-03-12 17:50 +0100

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