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@@ -0,0 +1,49 @@
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+.. SPDX-License-Identifier: GPL-2.0
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+
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+===========
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+IP-Aliasing
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+===========
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+
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+IP-aliases are an obsolete way to manage multiple IP-addresses/masks
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+per interface. Newer tools such as iproute2 support multiple
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+address/prefixes per interface, but aliases are still supported
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+for backwards compatibility.
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+
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+An alias is formed by adding a colon and a string when running ifconfig.
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+This string is usually numeric, but this is not a must.
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+
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+
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+Alias creation
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+==============
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+
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+Alias creation is done by 'magic' interface naming: eg. to create a
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+200.1.1.1 alias for eth0 ...
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+::
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+
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+ # ifconfig eth0:0 200.1.1.1 etc,etc....
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+ ~~ -> request alias #0 creation (if not yet exists) for eth0
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+
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+The corresponding route is also set up by this command. Please note:
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+The route always points to the base interface.
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+
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+
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+Alias deletion
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+==============
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+
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+The alias is removed by shutting the alias down::
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+
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+ # ifconfig eth0:0 down
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+ ~~~~~~~~~~ -> will delete alias
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+
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+
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+Alias (re-)configuring
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+======================
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+
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+Aliases are not real devices, but programs should be able to configure
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+and refer to them as usual (ifconfig, route, etc).
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+
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+
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+Relationship with main device
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+=============================
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+
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+If the base device is shut down the added aliases will be deleted too.
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