Iptables same network segment port forwarding

Iptables and network segment port forwarding Environment Description: You need to submit all packets accessing port 80 of the 192.168.1.20 host to 192.168.1.31 host for processing. Therefore, you need to perform the following operations on the host 192.168.1.20: 1. enable the routing forwarding function 1 echo "1">/proc/sys/net/ipv4/ip_forward2. add iptables Rule 1 iptables-t nat-I PREROUTING-p tcp -- dport 80-j DNAT -- to-destination 192.168.1.31: 802 iptables-t nat-I POSTROUTING-p tcp-d 192.168.1.31-j SNAT -- to-source 192.168.1.203. other commands 1 iptables-L-n2iptables-F # clear rules of all rule chains in the filter of the preset Table 3 iptables-X # clear rules 4 iptables-Z5 in the User-Defined chain in the filter of the preset table /etc/init. d/iptables save/restart/status6/etc/sysconfig/iptables