bridge and netfilter

bridge and netfilter

[Rodrigo Ventura]

        Hi everyone. What's the current status of the kernel bridging
code with respect to netfilter stack? We want to put a transparent
firewall working. So we need to apply netfilter rules to the packets
between two interfaces in the same bridge group.

        We've looked into the bridge-utils web pages, they mention a
kernel patch to make bridged packets to through the netfilter stack,
but the last patch update is for kernel 2.2.x.

        Does the current 2.4.x kernels include netfiltering bridged
packets? I just saw some references to netfilter in the bridge code, I
was wondering what they actually do...

        Cheers,

        PS: I did some experimentation with openbsd, and the fact is
they do support packet filtering over bridged packets, seamlessly
integrated into the whole operating system. Very neat indeed...

        PPS: Our dilemma is this: we have openbsd that filters bridged
packets but does not provide (AFAIK) sophisticated queuing policies,
and we have linux that does it (iproute2) but does not filter bridged
packets... :-\

-- 

*** Rodrigo Martins de Matos Ventura <yoda@isr.ist.utl.pt>
***  Web page: http://www.isr.ist.utl.pt/~yoda
***   Teaching Assistant and PhD Student at ISR:
***    Instituto de Sistemas e Robotica, Polo de Lisboa
***     Instituto Superior Tecnico, Lisboa, PORTUGAL
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Re: bridge and netfilter

[Patrick Cole]

Sat, Jul 14, 2001 at 07:59:32PM +0100, Rodrigo Ventura wrote:

>         Hi everyone. What's the current status of the kernel bridging
> code with respect to netfilter stack? We want to put a transparent
> firewall working. So we need to apply netfilter rules to the packets
> between two interfaces in the same bridge group.

>From what I've read the code is still experimental and there are a few
issues with it killing the machine. The 2.4 mainstream kernel has the 
hooks but an extra patch is required to get it going.

Pat

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