转载地址：http://soft.chinabyte.com/122/11072122.shtml
Linux下如何实现不同网段之间的访问
本实例要说明的是:实现10.0.0.0/24网段与192.168.2.0/24网段相互访问.
步骤1:查看本机IP地址
[root@localhost root]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0C:29:A7:6E:77
inet addr:10.0.0.120 Bcast:10.0.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2418 errors:0 dropped:0 overruns:0 frame.:0
TX packets:1293 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:1000347 (976.9 Kb) TX bytes:192592 (188.0 Kb)
Interrupt:10 Base address:0x2024
步骤2:添加路由规则
[root@localhost root]# route add -net 192.168.2.0/24 eth0
步骤3:查看路由规则
[root@localhost root]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.0.0.0 * 255.255.255.0 U 0 0 0 eth0
192.168.2.0 * 255.255.255.0 U 0 0 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
注：route规则中，必须同时存在两个网段，否则,一个网段的IP地址将无法访问到另一网段的IP地址。
步骤4:检测本地机(IP:10.0.0.120)与远程机(IP:192.168.2.80)是否可互访.
[root@localhost root]# ping 192.168.2.80
PING 192.168.2.80 (192.168.2.80) 56(84) bytes of data.
64 bytes from 192.168.2.80: icmp_seq=1 ttl=127 time=5.51 ms
64 bytes from 192.168.2.80: icmp_seq=2 ttl=127 time=3.17 ms
步骤5:删除路由规则
[root@localhost root]# route del -net 192.168.2.0/24 eth0
<!--StartFragment -->