Difference between revisions of "DNS"
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(Created page with "Domain Name Service. Bind a name to IP-addresses. Disable resolving IPv6 addresses by editing /etc/default/bind9 to have <code>OPTIONS="-4 -u bind"</code>") |
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Domain Name Service. Bind a name to IP-addresses. | 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 <code>OPTIONS="-4 -u bind"</code> | Disable resolving IPv6 addresses by editing /etc/default/bind9 to have <code>OPTIONS="-4 -u bind"</code> | ||
| + | |||
| + | =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 | ||
| + | <syntaxhighlight lang=text> | ||
| + | nameserver <dns-server1 IP> | ||
| + | nameserver <dns-server2 IP> | ||
| + | options <interface> | ||
| + | search <default search domain> | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | ;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 | ||
Latest revision as of 20:54, 19 November 2022
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