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Diffstat (limited to 'Documentation/networking/alias.txt')
| -rw-r--r-- | Documentation/networking/alias.txt | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/Documentation/networking/alias.txt b/Documentation/networking/alias.txt new file mode 100644 index 00000000..85046f53 --- /dev/null +++ b/Documentation/networking/alias.txt @@ -0,0 +1,40 @@ + +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. + +o 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. + + +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. |