Why port redirection using iptables NAT sometimes does not work ?
Issue
- Port redirection can be done using iptables rules as following
iptables -t nat -A PREROUTING -i bond0 --dst x.x.x.x -p tcp --dport 1234 -j REDIRECT --to-port 4321
iptables -t nat -A PREROUTING -i bond1 --dst y.y.y.y -p tcp --dport 1234 -j REDIRECT --to-port 4321
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But after some time these rule does not seem to work.
-
When we use following command to see whether the ports we are using in iptables rules are open or not, the NAT rules start working again.
nmap -sX x.x.x.x
Environment
- Red Hat Enterprise Linux Server release 5, 6
- iptables
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