Interface address sourced packets go thru default gateway on another interface

David DeSimone fox at verio.net
Thu Nov 15 22:37:37 PST 2007


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Brian Hawk <brian at tnetus.com> wrote:
>
> I believe binding an IP's source address to an interface address
> (instead of INADDR_ANY) is to make packets go out from *that*
> interface, not the default gw.

I'm afraid that's not how it works.  In the absence of policy-routing
options, packets are always routed ONLY by destination address.

Binding to a particular interface only set's the source IP that will be
attached to the packet, and will influence routing on the *return* trip
of any replies.

- -- 
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