Date: Tue, 17 Aug 1999 23:55:17 -0700 (PDT) From: Julian Elischer <julian@whistle.com> To: Ludo Koren <ludo_koren@tempest.sk> Cc: norman@nttmcl.com, freebsd-ipfw@FreeBSD.ORG Subject: Re: ipfw + bridging: fwd rule enacted but no effect Message-ID: <Pine.BSF.3.95.990817234319.11710B-100000@current1.whistle.com> In-Reply-To: <199908180608.IAA57956@t47.tempest.sk>
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I think it's possible that the question below shows a fundamental
misunderstanding of what the fwd operation does.. When the packet arrives
at B it will be forwarded by the normal code to the original
destination,.. C
I think the picture below has been messed up..
I think it should be (by adding newlines and spaces)
[A]-----[fxp0:D:fxp1]-----[C]
fxp2 ----
|
|
[B]
but I'm not sure..
On Wed, 18 Aug 1999, Ludo Koren wrote:
>
>
> > I'm having problems with ipfw fwd + bridging. Please help!
>
> > My setup is:
>
> > [A]-----[fxp0:D:fxp1]-----[C] fxp2 ---- | | [B]
>
>
>
> > D is the box that runs ipfw + bridging.
>
> > My rule is very simple:
>
> > 100 fwd B log all from A to C
last rule allow from any to any
>
> > Ideally , it should redirect any packets from A to C and emit
> > them out on interface fxp2 (linked to B). And those packets
> > are to be dropped dead on B.
yes, but they might not be dropped, but possibly forwarded back to D
(if net.inet.ip.forward is true) (or whatever it is..)
>
> > What happened is that logging messages indicate that rule 100
> > were envoked but with no effect. One can still ping from A to
> > C.
>
>
> > IPFW with no bridging (ie. machine B acting as a router) works
> > fine.
>
> > Bridging alone works fine.
>
> > But when combining ipfw + bridging, the fwd command doesn't
> > work.
hmmm tricky.
I'm not very sure about bridging.. I haven't looked at it.
>
> > Any one has the same problem before?
>
> > Also, I assume when doing bridging, I don't need to config the
> > routing table in machine B. Is this correct?
>
> Several days ago I sent similar question with no answer. After looking
> into the source code I realized this feature is not implemented. I
> spoke about it with Luigi Rizzo who has implemented the bridging
> stuff. He suggested that it's not appropriate for bridging as such. It
> should be done in `higher level'. But the problem is you need
> configuration as a gateway.
>
> Basically, I was convinced to implement it, but now I am considering if
> the solution is technically correct (e.g. I will not get troubles if
> the load on bridge will be high).
>
> ludo
>
>
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