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linux - multiple IP addresses bound - which one is used for outgoing packets?

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Using IP aliasing a linux box has
bound multiple ip addresses from the same subnet on the same NIC. So ifconfig shows up
device eth0 with , eth0:1 with and eth0:2 with
.



How does Linux determine the IP source address
used for outgoing ip traffic? Is there a way to define what source IP address certain
outgoing traffic should use?


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class="normal">Answer



I'm not
sure why he posted his answer as a comment, but David Schwartz is correct, you should
set a netmask of 255.255.255.255 on the 'secondary' addresses, and you should not set
gateway addresses on them. You put the correct netmask on the main address, and give it
the correct gateway address.


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