#环境准备
[root@internet ~]#hostname -I
192.168.0.6
[root@internet ~]#route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 eth0
0.0.0.0 192.168.0.8 0.0.0.0 UG 0 0 0 eth0
[root@firewall ~]#hostname -I
10.0.0.8 192.168.0.8
[root@firewall ~]#vim /etc/sysctl.conf
net.ipv4.ip_forward=1
[root@firewall ~]#sysctl -p
[root@lanserver1 ~]#hostname -I
10.0.0.7
[root@lanserver1 ~]#route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.0.0.8 0.0.0.0 UG 100 0 0 eth0
10.0.0.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0
[root@lanserver2 ~]#hostname -I
10.0.0.17
[root@lanserver2 ~]#route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.0.0.8 0.0.0.0 UG 100 0 0 eth0
10.0.0.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0
原文地址：http://www.cnblogs.com/z613171/p/16881808.html
