Re: ingress and flowid

Linux Advanced Routing and Traffic Control

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Andrés Ghigliazza wrote:
Hi there,

I am trying to understand our router / firewall, that was configured
by another person. It is a Debian GNU/Linux with several
configurations with tc and iptables.

I have a question about flowid in ingress qdisc. As fas as I know,
this qdisc is a dummy one, and flowid is just used with :1 because the
traffic have to be redirected to something.

However, in our router, there are some filters of ingress qdisc, that
have differents flowids (:1, :2 and :5). Does that have any sense?

If they are before the mirred egress redirect dev dummyX then they will not affect the shaping/classification on the dummy setup, but will be restored when the packets leave dummy - so you can shape again if say you were doing it on egress (you can't filter redirected packets twice to avoid loops). I don't know whether they carry over to egress when it's done on ingress.

Andy.
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