ubuntu - linux服务器双网卡连接到路由器共享网络，应该如何配置NAT？-PHP Chinese Network Q&A

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ubuntu - linux服务器双网卡连接到路由器共享网络，应该如何配置NAT？

高洛峰 2017-04-21 10:55:29

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服务器是ubuntu server 12.04 i386，装有双网卡。其中eth0连接到外网，eth1连接到路由器的WAN端口。想创建一个共享wifi，使其他设备都能通过服务器上网

cat /etc/network/interfaces

auto lo iface lo inet loopback #连接到外网 auto eth0 iface eth0 inet static address 212.114.20.78 netmask 255.255.255.0 gateway 212.114.20.126 dns-nameservers 212.114.0.242 8.8.8.8 #连接到路由器 auto eth1 iface eth1 inet static address 192.168.1.254 netmask 255.255.255.0

route -n

Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 212.114.20.126 0.0.0.0 UG 100 0 0 eth0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 212.114.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

路由器设置如下：

高洛峰

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PHPzhong2017-04-21 10:57:29 2 floor

echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j MASQUERADE

Also, what is the routing table of your server (route -noutput).

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洪涛2017-04-21 10:57:29 1 floor

Confirm that the physical wiring is correct, whether it canpingpassgatewayanddns, and whethereth1is connected to theWANport (non-LAN port)
Modify/etc/network/interfaces(corresponding to the changes to the eth0 part above)
Make the modification effective:sudo /etc/init.d/networking restart
Set the router as shown in the picture above and enable the routerDHCPservice
sudoExecute the following command:

/sbin/iptables -F /sbin/iptables -X /sbin/iptables -Z /sbin/iptables -F -t nat /sbin/iptables -X -t nat /sbin/iptables -Z -t nat /sbin/iptables -P INPUT ACCEPT /sbin/iptables -P OUTPUT ACCEPT /sbin/iptables -P FORWARD ACCEPT /sbin/iptables -t nat -P PREROUTING ACCEPT /sbin/iptables -t nat -P POSTROUTING ACCEPT /sbin/iptables -t nat -P OUTPUT ACCEPT echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -j MASQUERADE

Addiptables -t nat -A POSTROUTING -s 192.168.1.0/24 -j MASQUERADEto/etc/rc.local
If it still doesn’t work, check whether you followed Evian’s answers and comments

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