DNS: Difference between revisions
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| Line 19: | Line 19: | ||
;/etc/resolv.conf | ;/etc/resolv.conf | ||
<syntaxhighlight lang=text> | <syntaxhighlight lang=text> | ||
options timeout:1 attempts:1 rotate | |||
nameserver <dns-server1 IP> | nameserver <dns-server1 IP> | ||
nameserver <dns-server2 IP> | nameserver <dns-server2 IP> | ||
| Line 24: | Line 25: | ||
search <default search domain> | search <default search domain> | ||
</syntaxhighlight> | </syntaxhighlight> | ||
;If the systemd-resolved is active | ;If the systemd-resolved is active | ||
Revision as of 15:11, 18 May 2026
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
options timeout:1 attempts:1 rotate
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