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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
- alias for eth0 ...
- # ifconfig eth0:0 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
- too.