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#1 2021-08-09 21:35:37

lyntux
Member
Registered: 2017-06-28
Posts: 16

[Solved] Strangely, DNS Resolution Stopped working.

For some reason, basically all applications on my computer lost Internet access due to domain resolution problems. I can ping IP addresses, but can't ping domain names, so none of the applications on my computer that rely on DNS work.

I'm using systemd-resolved:

$ systemctl | grep bind
$ systemctl | grep dns
$ systemctl | grep dhc
$ systemctl | grep resolv
    systemd-resolved.service    loaded active running   Network Name Resolution

I'm using the DNS method for configuring resolved.

$ cat /etc/resolv.conf
nameserver 127.0.0.53
options edns0 trust-ad
search readcted

Resolvectl looks good:

$ resolvectl status                 
Global
           Protocols: +LLMNR +mDNS -DNSOverTLS DNSSEC=no/unsupported
    resolv.conf mode: stub
  Current DNS Server: 172.16.42.1
         DNS Servers: 172.16.42.1
Fallback DNS Servers: 1.1.1.1 1.0.0.1
          DNS Domain: redacted

Link 2 (enp0s10)
    Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
         Protocols: +DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
Current DNS Server: 172.16.42.1
       DNS Servers: 172.16.42.1

But, using it to query DNS does nothing.

$ resolvectl query www.google.com
{{...time passes...}
^C

But, manually pointing at my DNS server works fine.

$ drill @172.16.42.1 www.google.com
...
;; ANSWER SECTION:
www.google.com. 106     IN      A       142.251.33.100

Here's my Resolved startup script

$ cat /etc/systemd/resolved.conf
[Resolve]
DNS=172.16.42.1
FallbackDNS=1.1.1.1 1.0.0.1
#FallbackDNS=1.1.1.1 9.9.9.10 8.8.8.8 2606:4700:4700::1111 2620:fe::10 2001:4860:4860::8888
Domains=redacted
#LLMNR=yes
#MulticastDNS=yes
#DNSSEC=allow-downgrade
#DNSOverTLS=no
#Cache=yes
#DNSStubListener=yes
#ReadEtcHosts=yes

I'm not sure what I need to do to get DNS resolution working on my system. I've gone through the wiki to make sure I've don't everything correctly, but as far as I can tell, everything looks good. Can anyone help?

Last edited by lyntux (2021-08-09 22:25:37)

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#2 2021-08-09 21:47:13

seth
Member
Registered: 2012-09-03
Posts: 31,827

Re: [Solved] Strangely, DNS Resolution Stopped working.

I'm using systemd-resolved

I'm not sure what I need to do to get DNS resolution working on my system.

Not using resolved (for now), https://bbs.archlinux.org/viewtopic.php?id=268123

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#3 2021-08-09 22:25:53

lyntux
Member
Registered: 2017-06-28
Posts: 16

Re: [Solved] Strangely, DNS Resolution Stopped working.

Changed to DNSMASQ and everything started working as expected. Thanks!

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