jonathanio/update-systemd-resolved

fixed dns and search domains

eoli3n opened this issue · 5 comments

eoli3n commented

I want to set my custom dns server and domains search, is that possible ?

nameserver X.X.X.X
nameserver X.X.X.X
search abc.domain.com def.domain.com domain.com
eoli3n commented

I did my own script:

#!/usr/bin/env bash
INTERFACE="$1"
up () {
  /usr/bin/systemd-resolve \
     --interface="$INTERFACE" \
     --set-dns=1.1.1.1       \
     --set-dns=9.9.9.9       \
     --set-domain=some.domain.com \
     --set-domain=sub.some.domain.com \
     --set-domain=~domain.com
}

down () {
  resolvectl flush-caches
}

case $script_type in
  up)
    up
    ;;
  down)
    down
    ;;
esac

exit 0

Then i can resolve server1 which fqdn is server1.sub.some.domain.com
But then it can't resolv external fqdn as github.com

jonathanio commented

There are different kinds of domain options you can pass into systemd-resolved which governs how it will handle domains. There's DOMAIN (appended to bare names first, and routed through to the DNS servers on this link only), DOMAIN-SEARCH (appended to bare names if DOMAIN didn't work, and routed through to the DNS servers on this link only), and DOMAIN-ROUTE (just route requests for these domains through to the DNS servers on this link only).

It looks like you want a combination of DOMAIN (for the primary domain) and DOMAIN-SEARCH passed by the OpenVPN server into systemd-resolved.

eoli3n commented

What do you mean by "passing" ?

I want to edit this in client.conf, i don't manage the openvpn server.

As said in #48 (comment), I tried the following in client.conf

config /etc/openvpn/scripts/update-systemd-resolved.conf
pull-filter ignore dhcp option dns
pull-filter ignore dhcp option domain
dhcp-option dns "1.1.1.1", "9.9.9.9"
dhcp-option domain "domain.fr", "sub.domain.fr", "sub.sub.domain.fr";

It works for dns option but domain is not parsed as said in the comment.
Using domain-seach does not set anything when starting openvpn.

eoli3n commented

My bad, this worked

config /etc/openvpn/scripts/update-systemd-resolved.conf
pull-filter ignore dhcp option dns
pull-filter ignore dhcp option domain
pull-filter ignore dhcp option domain-search
dhcp-option dns "1.1.1.1", "9.9.9.9"
dhcp-option domain "domain.fr"
dhcp-option domain-search "sub.domain.fr"
dhcp-option domain-search "sub.sub.domain.fr"
jonathanio commented

No problem. I'm glad it's working!

  • 👍1