Hello, Philip Prindeville a écrit :
iptables -t nat -A PREROUTING -i $EXTIF -p tcp --dport 8080 -j DNAT --to-destination :80 but later in the INPUT chain, I'd like to be able to distinguish between a packet that came in directly to port 80 (which I'd reject) versus a packet that came in to a different port (like 8080 above) and was remapped... which I'd like to accept.
May I ask why ?
Is there a test to available in INPUT (and FORWARD) see if the packet had been rewritten in the PREROUTING chain?
You might try the '-m conntrack' match and its '--ctstate DNAT' option. Not sure it works when only remapping the port, though. Otherwise you can MARK packets in mangle/PREROUTING before they are remapped and accept or drop them after.
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