iptables端口转发

1.端口转发

[root@m01 ~]# iptables -t nat -A PREROUTING -d 10.0.0.61 -p tcp --dport 5555 -j DNAT --to-destination 172.16.1.7:22

[root@m01 ~]# iptables -t nat -A POSTROUTING -s 172.16.1.0/24 -j SNAT --to-source 10.0.0.61

2.IP转发

[root@m01 ~]#iptables -t nat -A PREROUTING -d 10.0.1.61 -j DNAT --to-destination 172.16.1.7
iptables -A FORWARD -i eth1 -s 172.16.1.0/24 -j ACCEPT
iptables -A FORWARD -o eth0 -s 172.16.1.0/24 -j ACCEPT
iptables -A FORWARD -i eth0 -d 172.16.1.0/24 -j ACCEPT
iptables -A FORWARD -o eth1 -d 172.16.1.0/24 -j ACCEPT
iptables -t nat -A POSTROUTING -s 172.16.1.0/24 -j SNAT --to-source 10.0.0.61

3.内部共享上网

[root@m01 ~]#echo 'net.ipv4.ip_forward = 1' >> /etc/sysctl.conf
sysctl -p

iptables -A FORWARD -i eth1 -s 172.16.1.0/24 -j ACCEPT
iptables -A FORWARD -o eth0 -s 172.16.1.0/24 -j ACCEPT
iptables -A FORWARD -i eth0 -d 172.16.1.0/24 -j ACCEPT
iptables -A FORWARD -o eth1 -d 172.16.1.0/24 -j ACCEPT
iptables -t nat -A POSTROUTING -s 172.16.1.0/24 -j SNAT --to-source 10.0.0.61