preroute raw filter only on some packets possible, why?

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Hi,

I read that the notrack target could be used to save performance. Is
it really possible to exclude for example packets to a specific port
from being tracked? How could the target know where the packet would
go, if the target has to be used in "preroute", before the routing
decision? I am referring to this text:
http://security.maruhn.com/iptables-tutorial/x4772.html
Thanks!

Regards,
Sladjan
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