FreeBSD ifconfig

FreeBSD uses ifconfig to manage network interfaces.

Documentation

man ifconfig	https://www.freebsd.org/cgi/man.cgi?query=ifconfig&apropos=0&sektion=0&manpath=FreeBSD+13.0-RELEASE+and+Ports&arch=default&format=html
freebsd handbook: network communication	https://docs.freebsd.org/en/books/handbook/partiv/

Basics

Dynamic

manipulate interfaces within shell.

# create/destroy a network interface of type 'tun'
ifconfig tun  create up
ifconfig tun0 destroy

Persistent

define interfaces to setup at boot.

# /etc/rc.conf

cloned_interfaces="bridge0 brige1"  # space separated virtual interfaces to create
ifconfig_bridge0="inet 10.0.1.1/8"  # assign ip address to bridge0
defaultrouter="192.168.1.1"         # your local nameserver

ipv4

# /etc/rc.conf

hostname="domain.com"
defaultrouter="192.168.1.1"         # gateway
ifconfig_em0="inet 192.168.1.0/24"  # define netwk for iface 'em0'

ipv6

NOTE:

untested

# /etc/rc.conf

ifconfig_em0_ipv6="inet6 ..."
ifconfig_em0_alias0="inet6 ..."
ipv6_default_router="..."
ipv6_gateway="..."