reroute-check

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Hi

In which cases does the reroute-check in this picture take place?
http://jengelh.hopto.org/images/nf-packet-flow.png 

I see the packets in raw.OUTPUT and mangle.OUTPUT.
I do set a mark in mangle.OUTPUT (and I log it to be sure).
Then I see the packet in filter.OUTPUT and mangle.POSTROUTING.

Note: I don't see it in nat.OUTPUT or nat.POSTROUTING, but I think that's
okay.

But an "ip rule fwmark" does not work. (out-interface stays the same, even
though the routing table refered by the ip rule only contains a default
gateway on another interface.)
So I think the reroute-check is not done.

So: Does the kernel always reroute? Or does it have to be triggered?

Regards,
  Steffen

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