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Date:      Wed, 12 Mar 2003 14:37:54 +0000
From:      David Malone <dwmalone@maths.tcd.ie>
To:        Sean Hamilton <sh@bel.bc.ca>
Cc:        hackers@freebsd.org
Subject:   Re: IP addresses of bridge interfaces
Message-ID:  <20030312143754.GA54896@walton.maths.tcd.ie>
In-Reply-To: <000601c2e813$9d849650$d1d7e8d8@slugabed.org>
References:  <000601c2e813$9d849650$d1d7e8d8@slugabed.org>

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On Tue, Mar 11, 2003 at 01:17:25PM -0800, Sean Hamilton wrote:
> I recently upgraded a FreeBSD 4.6.2 bridge to 5.0, and am having troubles
> with how it handles IP addresses.

This problem is due to a rather contraversial change, where packets
are only accepted to addressed to the interface they are recieved
on if:

	net.inet.ip.check_interface=1

This was left off in -stable, but was turned on by default in
-current 'cos some people felt it was a security hole. There was a
rather long thread about it when it was committed, and it was
discussed on bugtraq at some length. If you need to disable it, you
should be able to do:

	net.inet.ip.check_interface=0

in /etc/sysctl.conf.

	David.

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