Flux Between POST_ROUTING Verdicts and Packet Changes

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Hello all,

Because I can't found many info about some problems, I want to know
what happens betwen the moment I set the verdict in netfilter_queue,
and the moment the packet is changed by the NAT part of netfilter.

Just to explain, I'm jumping all packets from nat::POSTROUTING and
nat::PREROUTING to NFQUEUE, and creating conntrack entries to do
SNAT/DNAT some packets. After creating the conntrack entries, I just
set the verdict to NF_ACCEPT.

It seems to slow down my testing network, and I want to try to found
why it's too slow.

Thank you in the advance.

--Bruno Moreira Guedes
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