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+IP-aliases are an obsolete way to manage multiple IP-addresses/masks
+per interface. Newer tools such as iproute2 support multiple
+address/prefixes per interface, but aliases are still supported
+for 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.
+o Alias creation.
+ Alias creation is done by 'magic' interface naming: eg. to create a
+ 220.127.116.11 alias for eth0 ...
+ # ifconfig eth0:0 18.104.22.168 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.
+o Alias deletion.
+ The alias is removed by shutting the alias down:
+ # ifconfig eth0:0 down
+ ~~~~~~~~~~ -> will delete alias
+o Alias (re-)configuring
+ Aliases are not real devices, but programs should be able to configure and
+ refer to them as usual (ifconfig, route, etc).
+o Relationship with main device
+ If the base device is shut down the added aliases will be deleted