Well...
This seems to work:
iptables -t raw -A PREROUTING -d 172.27.0.111 -j DROP
iptables -t raw -A PREROUTING -s 172.27.0.111 -j DROP
So far...
ET 


kitepilot@kitepilot.com writes: 

> I did not however know about '-m physdev --physdev-in'
> That may be the ticket!   8-)
> Will report...
> ET  
> 
> 
> Michael Butash writes:  
> 
>> I was curious too as usually not ever doing bridging within linux, and 
>> not to be an arse, but googling "iptables bridge filter" for you seemed 
>> to turn up interesting results first:  
>> 
>> http://serverfault.com/questions/607224/iptables-matching-packets-for-bri 
>> d ged-interface  
>> 
>> I never knew about ebtables myself, so great question none the less.  
>> 
>> -mb  
>> 
>>   
>> 
>> On 12/23/2015 01:20 AM, kitepilot@kitepilot.com wrote:
>>> Hello there...
>>> I have a 2-nics Linux box configured as a bridge 'br0'.
>>> World comes in via either nic (eth0 or eth1) and network is fed via the 
>>> other nic (eth1 or eth0 depending on above, should be irrelevant).
>>> I have a non trivial question and PLEASE avoid the 'use iptables' answer 
>>> unless you know what rule to apply to which chain and on which interface 
>>> (eth0/eth1/br0).
>>> Non trivial question is:
>>> How do I block specific IP addresses/networks from traversing the 
>>> bridge?
>>> Or in other words:
>>> I want all connections from a particular address/subnet to be DROP(ed) 
>>> in that bridge.
>>> Neither FORWARD nor INPUT will catch the packet in br0 because it is 
>>> neither addressed to the box not NAT(ed), and apparently neither eth0 
>>> nor eth1 will hand packets to netfilter.
>>> Thanks.
>>> ET
>>> PS: Merry Xmas to all...   :)
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