Static IPs, IPv6 and DNS

1Static IPv4

sysrc ifconfig_em0="inet 192.0.2.10/24"
sysrc defaultrouter="192.0.2.1"

# an extra address (alias):
sysrc ifconfig_em0_alias0="inet 192.0.2.11/32"

Or for DHCP: sysrc ifconfig_em0="DHCP".

2Static IPv6

sysrc ifconfig_em0_ipv6="inet6 2001:db8::10 prefixlen 64"
sysrc ipv6_defaultrouter="2001:db8::1"

For automatic configuration from router advertisements (SLAAC) instead:

sysrc ifconfig_em0_ipv6="inet6 accept_rtadv"
sysrc rtsold_enable=YES

3Apply the changes

Applying network changes over SSH can cut you off, so do this from the console or be ready to recover.

service netif restart && service routing restart

4DNS with resolv.conf

Name servers are listed in /etc/resolv.conf. On DHCP systems this file is managed by resolvconf; to set servers permanently, configure /etc/resolvconf.conf and regenerate.

# /etc/resolv.conf
search example.org
nameserver 192.0.2.53
nameserver 2001:db8::53

# or via resolvconf:
echo 'name_servers="192.0.2.53 2001:db8::53"' >> /etc/resolvconf.conf
resolvconf -u

5A local caching resolver with local_unbound

The base system includes Unbound for local caching and DNSSEC validation. Enabling it rewrites resolv.conf to point at 127.0.0.1 and forwards to your previous servers.

sysrc local_unbound_enable=YES
service local_unbound start
cat /etc/resolv.conf

6Hostname

sysrc hostname="host.example.org"
hostname host.example.org