.. SPDX-License-Identifier: GPL-2.0 ===========IP-Aliasing=========== IP-aliases are an obsolete way to manage multiple IP-addresses/masksper interface. Newer tools such as iproute2 support multipleaddress/prefixes per interface, but aliases are still supportedfor backwards compatibility. An alias is formed by adding a colon and a string when running ifconfig.This string is usually numeric, but this is not a must.  Alias creation============== Alias creation is done by 'magic' interface naming: eg. to create a200.1.1.1 alias for eth0 ...::   # ifconfig eth0:0 200.1.1.1  etc,etc....	~~ -> request alias #0 creation (if not yet exists) for eth0 The corresponding route is also set up by this command.  Please note:The route always points to the base interface.  Alias deletion============== The alias is removed by shutting the alias down::   # ifconfig eth0:0 down	~~~~~~~~~~ -> will delete alias  Alias (re-)configuring====================== Aliases are not real devices, but programs should be able to configureand refer to them as usual (ifconfig, route, etc).  Relationship with main device============================= If the base device is shut down the added aliases will be deleted too.