Manually assign (add) fixed (static) IP on FreeBSD

Manually assign/add fixed/static IP on FreeBSD:

ifconfig em0 inet  netmask 

route add default 

/etc/netstart

e.g.

ifconfig em0 inet 192.168.0.10 netmask 255.255.255.0

route add default 192.168.0.1

/etc/netstart

Make changes permanently :
As an example of the above, insert the below parameters into /etc/rc.conf :

ifconfig_em0="inet 192.168.0.10 netmask 255.255.255.0"
defaultrouter="192.168.0.1"
hostname="hostname.domain.com"

Remove assigned IP address from network interface

ifconfig  down delete

e.g.

ifconfig em0 down delete

Static IP or DHCP Configuration on Ubuntu / Debian

How to configure Ubuntu Linux with
static or dynamic (dhcp) IP
by morphus.dk

File: /etc/network/interfaces

Static IP example:

auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 208.88.34.106 netmask 255.255.255.248 broadcast 208.88.34.111 network 208.88.34.104 gateway 208.88.34.110

Dynamic IP (DHCP) example:

auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp auto eth1 iface eth1 inet dhcp auto eth2 iface eth2 inet dhcp auto ath0 iface ath0 inet dhcp auto wlan0 iface wlan0 inet dhcp

Interfaces:

• lo: Loopback interface (network within your system without slowing down for the real ethernet based network)
• eth0: First ethernet interface card
• wlan0: First wireless network interface

Also see "man interfaces"