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