RE: [LARTC] blocking traffic on the FORWARD chain using physdev

[Oscar Mechanic <oscar@ufomechanic.net>]

Are you sure you want to block ICMP how about PMTU 

 ebtables -I FORWARD 1 -i eth0 -p ip --ip-protocol icmp

On Thu, 2006-12-14 at 21:34 +0900, William Bohannan wrote:
> Thanks for that.  Would you be able to give a simple example on how to
> block outgoing traffic using ebtables and icmp? as I get an error when
> using icmp?
>  
> ebtables -A FORWARD -i eth1 -p icmp -j DROP
> 
> Error message - "Problem with the specified protocol."
> 
> 
> Kind Regards
> William 
> 
> 
> -----Original Message-----
> From: Oscar Mechanic [mailto:oscar@ufomechanic.net] 
> Sent: 14 December 2006 12:27
> To: William Bohannan
> Cc: lartc@mailman.ds9a.nl
> Subject: Re: [LARTC] blocking traffic on the FORWARD chain using physdev
> 
> Hi
> 
>    Physdev may no longer be supported soon something to do with hooks
> and how this is difficult to support. I have stopped using it cause I
> found some odd behavior in physdev-in, out seemed fine I remember. I use
> ebtables and marks for this now.
> 
> 
> On Thu, 2006-12-14 at 20:55 +0900, William Bohannan wrote:
> > Currently using physdev on a bridge to try and isolate certain paths
> > across and to the bridge.  It all works except when trying to stop the
> > flow in one direction on the FORWARD chain?? Can someone please help??
> > 
> > Below is the testing done so far.
> > 
> > eth1 <---> BRIDGE <---> eth0
> > 
> > # Block (eth0 ---> eth1) - blocks both directions and not just one?? 
> > iptables -A FORWARD -m physdev --physdev-out eth1 -p icmp -j DROP
> > 
> > # Block (eth0 <--- eth1) - blocks both directions and not just one??
> > iptables -A FORWARD -m physdev --physdev-out eth1 -p icmp -j DROP
> > 
> > # Block (eth0 ---> BRIDGE) - working
> > iptables -A INPUT -m physdev --physdev-in eth0 -p icmp -j DROP
> > 
> > # Block (eth0 <--- BRIDGE) - working
> > iptables -A OUTPUT -m physdev --physdev-out eth0 -p icmp -j DROP
> > 	
> > # Block (eth1 ---> BRIDGE) - working
> > iptables -A INPUT -m physdev --physdev-in eth1 -p icmp -j DROP
> > 
> > # Block (eth1 <--- BRIDGE) - working
> > iptables -A OUTPUT -m physdev --physdev-out eth1 -p icmp -j DROP
> > 
> > 
> > Kind Regards
> > William 
> > 
> > _______________________________________________
> > LARTC mailing list
> >
> LARTC@mailman.ds9a.nlhttp://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lar
> tc
> 

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