iptables rule active only for certain port

Question

I have the following rule:

iptables -t nat -A PREROUTING -d 93.xxx.61.56 -j DNAT --to-destination 10.8.0.10

Problem is that this rule affects some programs and I want this rule to be active only for a specific port like 443.

Is it possible to do that? I mean, everything else that tries to connect to 93.xxx.61.56 on a different port than 443 should not be affected by this rule.

many thanks.

Answer 1

Try

iptables -t nat -A PREROUTING -d 93.xxx.61.56 --sport 443 -j DNAT --to-destination 10.8.0.10d

Answer 2

Add -p tcp --dport 443 to your command, and then it will only match TCP packets with destination port = 443.