Iptables Port Forwarding Command

The requirement is simple to map the local 81 port to port 8080

1. All 81 requests were forwarded to 8080.

 

1	# iptables-t nat-a prerouting-p tcp--dport 81-j REDIRECT--to-ports 8080

If you need this machine to be accessible, you need to configure the output chain:

 

1	Iptables -t nat -a Output -p tcp --dport 81 - J redirect --to-ports 8080

Reason: Extranet access needs to go through the prerouting chain, but localhost does not pass through the chain, so it needs to use output, or postrouting. Postrouting, No.

Iptables Port Forwarding Command