Re: Ingress shaping via connection marking

Linux Advanced Routing and Traffic Control

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On Thu, 2013-06-13 at 00:05 +0100, Andrew Beverley wrote:
> On Wed, 2013-06-12 at 18:04 -0400, David Shaw wrote:
> [...]
> > Unfortunately, this doesn't work.  While the restore-mark/save-mark
> > stuff works great, and the incoming packets do have the correct mark as
> > set by the process originating the connection, and the ifb stuff works
> > great in that it forwards the incoming data to the ifb device, I can't
> > connect the two.  It seems the mirred egress grabs the incoming packets
> > before they go through iptables and so their marks are never restored,
> > and thus the only data I see on the ifb device is not marked.
> 
> That's your problem I'm afraid. IFB grabs the packets before they hit
> the netfilter stack, so they won't have any marks applied. Your only
> options are:
> 
> 1. Do the shaping on the opposite outbound interface (so if you're
> forwarding packets from ppp0 to eth0 and are trying to do the ingress
> shaping on ppp0, then do it on the egress of eth0 instead). This only
> works if you are actually forwarding packets.
> 
> 2. Use IMQ, which unfortunately is not part of the vanilla kernel.
> 
<snip>
We faced the same issue and found that we could do it with the IFB
interface but needed to do the classification with tc filters.  Although
it took quite a bit of getting use to, we were able to produce some very
sophisticated results similar to what we would normally do with iptables
including chaining filters.

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