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49 lines
1.2 KiB
49 lines
1.2 KiB
.. SPDX-License-Identifier: GPL-2.0 |
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=========== |
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IP-Aliasing |
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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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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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Alias creation |
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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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# 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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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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Alias deletion |
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============== |
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The alias is removed by shutting the alias down:: |
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# ifconfig eth0:0 down |
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~~~~~~~~~~ -> will delete alias |
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Alias (re-)configuring |
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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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Relationship with main device |
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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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