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Date:      Tue, 25 Jun 2002 05:54:57 -0700
From:      Luigi Rizzo <luigi@iet.unipi.it>
To:        Suresh Ramasamy <sureshdr@time.net.my>
Cc:        ipfw@freebsd.org
Subject:   Re: Question on Filtered Bridging and ARP takeovers
Message-ID:  <20020625055457.B24694@iguana.icir.org>
In-Reply-To: <5.1.0.14.2.20020625130437.02cf03f0@pop.time.net.my>; from sureshdr@time.net.my on Tue, Jun 25, 2002 at 01:24:51PM +0800
References:  <5.1.0.14.2.20020625120053.02bf64e8@pop.time.net.my> <5.1.0.14.2.20020625120053.02bf64e8@pop.time.net.my> <20020624215809.A21492@iguana.icir.org> <5.1.0.14.2.20020625130437.02cf03f0@pop.time.net.my>

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sounds like it is the "new firewall" that is broken, not FreeBSD!

	cheers
	luigi

On Tue, Jun 25, 2002 at 01:24:51PM +0800, Suresh Ramasamy wrote:
> Thanks Luigi,
> 
> I've installed a filtered bridging running on FreeBSD 4.5 Stable
> with these config
> 
> WAN ---------- FB (10.10.68.181) ---- Client (10.10.68.222)
>              |
>            +---------- the rest of 10.10.68.x
> 
> Recently, a new firewall was introduced and this firewall was using an 
> active ARP
> scanning that "overtakes" IP that does not respond to ping.
> 
> The client 68.222 is ICMP disabled with only a few TCP ports open.
> What i noticed is that when I ping from WAN segment to the client,
> in the FB, it shows that ARP is taken over by the rogue firewall.
> 
> Temporary Workaround
> 
> I added a static ARP entry onto FB (arp -S 10.10.68.222 mac_address pub) to
> publish the ARP into the network segment switch.
> 
> Or is there a documented workaround?
> 
> 
> Q: Should the bridge function on FreeBSD address the ARP poisoning issue?
> If so, I would like to recommend an addition of this into the bridge function
> to identify network at the other end and establish an arp broadcasting 
> function for
> the segment behind the filtered bridging.
> 
> At 12:58 PM 6/25/2002, you wrote:
> >On Tue, Jun 25, 2002 at 12:01:46PM +0800, Suresh Ramasamy wrote:
> > > I have a question on FreeBSD filtered bridging and ARP
> > > takeovers. Could i direct the question to you, or specifically to
> > > a mailing list?
> >
> >just ask both me and ipfw@freebsd.org
> >
> >luigi
> 

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