projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | |
| 2 | IP-Aliasing: | |
| 3 | ============ | |
| 4 | ||
| 58092d1e SH |
5 | IP-aliases are an obsolete way to manage multiple IP-addresses/masks |
| 6 | per interface. Newer tools such as iproute2 support multiple | |
| 7 | address/prefixes per interface, but aliases are still supported | |
| 8 | for backwards compatibility. | |
| 1da177e4 | 9 | |
| 58092d1e SH |
10 | An alias is formed by adding a colon and a string when running ifconfig. |
| 11 | This string is usually numeric, but this is not a must. | |
| 1da177e4 LT |
12 | |
| 13 | o Alias creation. | |
| 14 | Alias creation is done by 'magic' interface naming: eg. to create a | |
| 15 | 200.1.1.1 alias for eth0 ... | |
| 16 | ||
| 17 | # ifconfig eth0:0 200.1.1.1 etc,etc.... | |
| 18 | ~~ -> request alias #0 creation (if not yet exists) for eth0 | |
| 19 | ||
| 20 | The corresponding route is also set up by this command. | |
| 21 | Please note: The route always points to the base interface. | |
| 22 | ||
| 23 | ||
| 24 | o Alias deletion. | |
| 25 | The alias is removed by shutting the alias down: | |
| 26 | ||
| 27 | # ifconfig eth0:0 down | |
| 28 | ~~~~~~~~~~ -> will delete alias | |
| 29 | ||
| 30 | ||
| 31 | o Alias (re-)configuring | |
| 32 | ||
| 33 | Aliases are not real devices, but programs should be able to configure and | |
| 34 | refer to them as usual (ifconfig, route, etc). | |
| 35 | ||
| 36 | ||
| 37 | o Relationship with main device | |
| 38 | ||
| 39 | If the base device is shut down the added aliases will be deleted | |
| 40 | too. |