I'm running into the same issue. My network doesn't have IPv6 although
its configured to try, turning off IPv6 had no effect.
If I direct all traffic through the VPN ('Use this connection only for
resources on its network' in the routes window is left unchecked) I get
a DNS server but its not used by default
$ dig @127.0.1.1 +short chaos txt servers.bind
"10.172.64.1#53 12 0"
$ dig google.com +short
# No result returned
$ dig google.com +short @10.172.64.1
172.217.4.174
If I only direct VPN traffic for resources on the VPN network('Use this
connection only for resources on its network' in the routes window is
checked) on BOTH IPv4 and IPv6 I get two DNS servers and DNS seems to
work.
$ dig @127.0.1.1 +short chaos txt servers.bind
"192.168.1.1#53 6 0" "10.172.64.1#53 0 0"
$ dig google.com +short
216.58.216.174
So it seems network manager is adding the VPN DNS server but its not
using it.
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https://bugs.launchpad.net/bugs/1603898
Title:
DNS resolution fails when using VPN and routing all traffic over it
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