[linux] 간단한 NAT 설정 script

#!/bin/sh

insmod ip_tables

insmod iptable_filter

insmod ip_conntrack

insmod ip_conntrack_ftp

insmod ip_nat_ftp

insmod ipt_state

insmod ipt_limit

iptables -t filter -F user_chain

iptables -t filter -X user_chain

iptables -t filter -N user_chain

iptables -t filter -F FORWARD

#iptables -t filter -A FORWARD -p tcp -d 192.168.3.80 -j user_chain

iptables -t filter -A user_chain -j DROP

iptables -t nat -F POSTROUTING

iptables -t nat -A POSTROUTING -s 192.168.1.2 -o eth0 -j SNAT --to 192.168.3.80

iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to 192.168.3.68

iptables -t nat -F PREROUTING

iptables -A PREROUTING -t nat -d 192.168.3.80 -j DNAT --to 192.168.1.2

##/proc/sys/net/ipv4/ip_forward

##파일을 수정 0 --> 1 로 수정