Re: [gentoo-user] Wireless DHCP takes over resolv.conf

[Marat BN]

The solution I use when dealing with the problem of network software
overwriting '/etc/resolf.conf' is to make that file immutable with
'chattr +i'.

Not quite an answer to your question on nameserver prioritization, but
could be useful to prevent your nameservers from being changed.


-- Marat



On 07/09/2016 07:53 AM, Mick wrote:
> Hi All,
>
> I just noticed my resolv.conf is topped up with the nameservers of the
> wireless LAN I happen to be associated at the time and my wired ethernet
> nameserver(s) are pushed further down.  This happens despite the fact that I
> have configured my wired ethernet to have a lesser priority than the wired NIC.
>
> For example:
>
> less /etc/resolv.conf
> # Generated by dhcpcd from wlan0.dhcp, enp11s0.dhcp
> # /etc/resolv.conf.head can replace this line
> domain openwifi
> nameserver 192.168.22.22
> nameserver 192.168.22.23
> nameserver 10.10.10.254
> # /etc/resolv.conf.tail can replace this line
>
> The first 3 non-commented entries were produced by wlan0, demoting my wired
> ethernet nameserver.
>
> ip route show
> default via 10.10.10.254 dev enp11s0  metric 10
> default via 10.160.95.1 dev wlan0  metric 20
> 10.10.10.0/24 dev enp11s0  proto kernel  scope link  src 10.10.10.7  metric 10
> 10.160.95.0/29 dev wlan0  proto kernel  scope link  src 10.160.95.2  metric 20
> 127.0.0.0/8 dev lo  scope host
>
> If I am associated, but not authenticated with the wireless LAN, any URLs I
> try to visit will be queried with the 192.168.22.2* nameserver, before it
> times out and 10.10.10.254 takes over.
>
> Waiting for URLs to resolve becomes tedious after a while.  Is there a way to
> prioritise nameservers so that the NIC metric is respected, whenever the
> resolv.conf content is updated?
>