For a while now my Wireguard VPN provider has been handing out a bad DNS server. So whenever I do a DNS lookup it takes five (5!) seconds timing out, which is quite annoying.
This blog post is about how you can fix this with
openresolv in Ubuntu.
apt install wireguard wireguard-tools on Ubuntu 20.04, you
need a manager for
/etc/resolv.conf. There are two options here; the
resolvconf package and the newer
openresolv. To fix my
problems I chose the latter.
With the system up and your
wg0 connection active (setting it up is
not the topic of this post), edit the file
its named that even though we’re using the
openresolv package. There
is lots of stuff already in it, but add the following:
$ sudo vim /etc/resolvconf.conf # Slow/inactive DNS servers /Jocke name_server_blacklist=2001:9b1:8826::53 # The edns0 option is from the original resolvconf resolv_conf_options="edns0 timeout:1" # Also from original resolvonf append_search=localdomain
I’ve added my malfunctioning IPv6 DNS server to the blacklist. This
means any provider wanting to add a DNS server to
will be filtered through that blacklist.
timeout:1 option (notice the double qoutes for multiple
options!). I’ve set the timeout to 1, the default is 5 sec, in case
any other DNS server starts misbehaving.