ifconfig eth0:2 netmask up

up: activate the interface
down: deactivate the interface

[-]arp: enable / disable the use of arp
[-]allmulti: enable / disable reception of hardware multicast packets
[-]broadcast addr: enable / disable accepting datagram destined for broadcast address

mtu N: set mtu
netmask mask: set network mask
irq irq: set IRQ
hw type addr: set hardware address for certain device such as X.25
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