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Date:      Sat, 1 Apr 2000 11:20:47 -0800
From:      Alfred Perlstein <bright@wintelcom.net>
To:        Sergei Vyshenski <svysh@pn.sinp.msu.ru>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: source address from multihomed host
Message-ID:  <20000401112047.U21029@fw.wintelcom.net>
In-Reply-To: <3.0.5.32.20000401125236.007bbd60@vivaldi>; from svysh@pn.sinp.msu.ru on Sat, Apr 01, 2000 at 12:52:36PM %2B0400
References:  <3.0.5.32.20000401125236.007bbd60@vivaldi>

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* Sergei Vyshenski <svysh@pn.sinp.msu.ru> [000401 01:18] wrote:
> BIND-8 has a nice configuration feature. Source address 
> for outgoing UDP queries from a multihomed host can be 
> fixed to a single IP number, irrespective of query destination.
> This makes things like firewalls more clear and error-free.
> 
> Can FreeBSD solve this at a system level,
> that is extend this feature to TCP packets, and 
> to other daemons (say sendmail)?

The source number is always fixed on outgoing connections, but
it's up to the application to specify if it wants to use an 
IP address other than the primary.

You may want to look at the manpage for 'jail' as it allows
you to create virtual machines where the primary IP of the
virtual machine is different from the primary of the whole
box.

-- 
-Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]
"I have the heart of a child; I keep it in a jar on my desk."


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