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From: Brad Hards <bhards@bigpond.net.au>
To: root@chaos.analogic.com, Tomas Szepe <szepe@pinerecords.com>
Subject: Re: [OT] ipv4: how to choose src ip?
Date: Fri, 6 Dec 2002 07:56:31 +1100
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On Fri, 6 Dec 2002 07:37, Richard B. Johnson wrote:
> > I'm not interested in rewriting the source address with netfilter based
> > on destination and/or service;  What I'm looking for is rather a way to
> > initiate two connections to the same destination host using the two
> > different source IP addresses.
>
> The simple answer is that if you need a specific IP address
> associated with a "multi-honed" host, that has only one interface,
> then something is broken. And you get to keep the pieces.

There are some reasons why you might like to use a specific address on a 
machine that is multi-homed, although normally the logic in the kernel works 
fine. I won't try to explain it in detail at this stage, but link-local is a 
personal favourite.

Probably all you want is to use the SO_BINDTODEVICE socket option.

Brad
- -- 
http://linux.conf.au. 22-25Jan2003. Perth, Aust. I'm registered. Are you?
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