ipfw broken with bridge under 5.x (5.3 and 5.4)

[Josef Karthauser]

On Wed, May 04, 2005 at 06:13:22PM +0100, Gavin Atkinson wrote:
> 
> I believe I am seeing similar problems to you, though uptime for me is
> generally measurable in days rather than minutes.  I've found that
> adding an explicit "allow all from any to any" and then removing it
> again seems to get it working.  I will test your solution when mine
> fails again.
> 
> The comment about arp is an interesting one, I will see what I can find
> out.  I have however seen situations where (eg) UDP DNS through the
> bridge works but web traffic or terminal services etc may not.
> 
> If you want to share firewall rules and other configuration with me
> off-list to see if there are any similarities I'd be happy to help.
> 

It appears that the solution is obtained by adding the rule:

    allow ip from any to any layer2 mac-type arp

to the beginning of the firewall list.  IPFW2 drops non-IP traffic
whereas IPFW1 passes it though.  This is the reason why my configuration
stopped working after the upgrade.

Joe
-- 
Josef Karthauser (joe at tao.org.uk)	       http://www.josef-k.net/
FreeBSD (cvs meister, admin and hacker)     http://www.uk.FreeBSD.org/
Physics Particle Theory (student)   http://www.pact.cpes.sussex.ac.uk/
================ An eclectic mix of fact and theory. =================
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