DNS over TLS on Arch Linux

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Domain name resolution is not standardized, some application use NSS, some use D-Bus, others use stub resolvers. systemd-resolved handles all of them and comes with systemd that Arch Linux uses.

systemd-resolved configuration file is at /etc/systemd/resolved.conf, yours should look like this:

[Resolve]
DNS=1.1.1.1
FallbackDNS=127.0.0.1 ::1
Domains=~.
#LLMNR=yes
#MulticastDNS=yes
DNSSEC=yes
DNSOverTLS=yes
#Cache=yes
#DNSStubListener=yes
#ReadEtcHosts=yes

You should enable the systemd-resolved service.

sudo systemctl enable --now systemd-resolved

NetworkManager

Since you are probably using NetworkManager, you should tell it to use systemd-resolved by going to its configuration file (/etc/NetworkManager/NetworkManger.conf) and specifying dns property.

This is how your /etc/NetworkManager/NetworkManger.conf should look like:

[main]
plugins=keyfile
dns=systemd-resolved

You will probably need to restart your computer for changes to take effect.

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