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linux 内网网关nat 上网

内网机器需要更新下载软件时,用内网可上网机器作nat连接外网

网关 外网网卡ip:61.88.54.23 网关:61.88.54.1 内网网卡ip:192.168.0.39 网关:无

客户机 内网网卡ip:192.168.0.40

内网网卡接在同一交换机上

1.网关机 #打开内核的包转发功能 echo 1 > /proc/sys/net/ipv4/ip_forward #建立IP转发和映射

iptables -A FORWARD -d 192.168.0.0/24 -j ACCEPT iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eth0 -j SNAT –to-source 61.88.54.23

2.客户机 先加个corn 15点40自动清除,防止操作失败 crontab -e

40 15 * * * /sbin/route del default gw 192.168.0.39

3.添加路由 route add default gw 192.168.0.39

4.测试外网连接 ping 8.8.8.8

5.开机运行 vi /etc/rc.local

route add default gw 192.168.0.39

6.清除crontab

参考: http://panpan.blog.51cto.com/489034/189072

Posted in LINUX.

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By C1G – 2013/04/28

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