Ubuntu 将两张网卡的ubuntu配置成路由器
eth0 Link encap:Ethernet HWaddr 40:16:9f:f0:fc:10
inet addr:192.168.1.18 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::4216:9fff:fef0:fc10/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:637 errors:0 dropped:0 overruns:0 frame:0
TX packets:591 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:632116 (632.1 KB) TX bytes:60416 (60.4 KB)
eth1 Link encap:Ethernet HWaddr 50:e5:49:14:0d:95
inet addr:172.17.64.228 Bcast:172.17.65.255 Mask:255.255.254.0
inet6 addr: fe80::52e5:49ff:fe14:d95/64 Scope:Link
inet6 addr: 2001:db8::6ccd:b1a3:c799:25e/64 Scope:Global
inet6 addr: 2001:db8::52e5:49ff:fe14:d95/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:29201 errors:0 dropped:3488 overruns:0 frame:0
TX packets:3022 errors:0 dropped:0 overruns:0 carrier:1
collisions:0 txqueuelen:1000
RX bytes:4318829 (4.3 MB) TX bytes:364085 (364.0 KB)
172.16.100.7, 172.16.100.9, 172.16.100.8, 172.17.198.32
1.sudo apt-get remove network-manager
sudo vim /etc/network/interfaces
auto lo
iface lo inet loopback
auto eth1
iface eth1 inet static
address 192.168.168.137
gateway 192.168.168.1
netmask 255.255.255.0
dns-nameservers 114.114.114.114
auto eth1:1
iface eth1:1 inet static
address 172.16.184.210
netmask 255.255.255.0
auto eth0
iface eth0 inet static
address 192.168.1.12
netmask 255.255.255.0
auto eth0:1
iface eth0:1 inet static
address 192.168.0.1
netmask 255.255.255.0
重启，使相关配置生效 sudo /etc/init.d/networing restart
2. 配置使系统具备路由功能
sudo vim /etc/sysctl.conf
net.ipv4.ip_forward=1
重启配置， 使生效sudo sysctl -p。
3. 添加NAT条目
sudo iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eth1 -j MASQUERADE
-s source network
-o dest netwok card
注， 第三步添加NAT条目的配置在重启后就会消失，应重新添加或写脚本在启动时就添加。
若要求永久生效， 则按下列步骤。
sudo vim /etc/init.d/nat
添加 sudo iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eth1 -j MASQUERADE
sudo chmod 777 /etc/init.d/nat
sudo ln -s /etc/init.d/nat /etc/rcS.d/S42nat
