1 .. SPDX-License-Identifier: GPL-2.0 2 3 =========== 4 IP-Aliasing 5 =========== 6 7 IP-aliases are an obsolete way to manage multiple IP-addresses/masks 8 per interface. Newer tools such as iproute2 support multiple 9 address/prefixes per interface, but aliases are still supported 10 for backwards compatibility. 11 12 An alias is formed by adding a colon and a string when running ifconfig. 13 This string is usually numeric, but this is not a must. 14 15 16 Alias creation 17 ============== 18 19 Alias creation is done by 'magic' interface naming: eg. to create a 20 200.1.1.1 alias for eth0 ... 21 :: 22 23 # ifconfig eth0:0 200.1.1.1 etc,etc.... 24 ~~ -> request alias #0 creation (if not yet exists) for eth0 25 26 The corresponding route is also set up by this command. Please note: 27 The route always points to the base interface. 28 29 30 Alias deletion 31 ============== 32 33 The alias is removed by shutting the alias down:: 34 35 # ifconfig eth0:0 down 36 ~~~~~~~~~~ -> will delete alias 37 38 39 Alias (re-)configuring 40 ====================== 41 42 Aliases are not real devices, but programs should be able to configure 43 and refer to them as usual (ifconfig, route, etc). 44 45 46 Relationship with main device 47 ============================= 48 49 If the base device is shut down the added aliases will be deleted too.
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