DNS
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Domain Name Service. Bind a name to IP-addresses.
Server side
Zone transfer between master and slave server is on TCP port 53.
Disable resolving IPv6 addresses by editing /etc/default/bind9 to have OPTIONS="-4 -u bind"
Client side
Clients query the nameserver on UDP port 53.
- host <hostname or IPaddress>
- Resolve hostname to IPadddres or IPaddress to hostname
- host <host or IP> <nameserver>
- Resolve using the specified nameserver
- dig <hostname> @<nameserver>
- Resolve hostname with extra info from the optinoal <nameserver>
- /etc/resolv.conf
nameserver <dns-server1 IP>
nameserver <dns-server2 IP>
options <interface>
search <default search domain>
- If the systemd-resolved is active
/etc/resolv.conf has 127.0.0.53 as nameserver
- resolvectl status
- Show which nameservers are used by the systemd-resolved