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- .. SPDX-License-Identifier: GPL-2.0
- ===========
- IP-Aliasing
- ===========
- 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.
- Alias creation
- ==============
- Alias creation is done by 'magic' interface naming: eg. to create a
- 200.1.1.1 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 configure
- and 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.
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