linux双网卡的配置

原创

summerfeng 2012-04-11 20:03:02 博主文章分类：linux ©著作权

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服务器：IBM X3650
系统    ：Red Hat Enterprise Linux Server release 5.4
eth0     : IP=10.30.10.19
                 NETMASK=255.255.255.0
                 GATEWAY=10.30.10.254
                 DNS1=10.30.10.1
eth1     : IP=192.168.0.11
                  NETMASK=255.255.255.0
                  GATEWAY=192.168.0.1
                  DNS1=192.168.0.1
以上分别为两张网卡设置的IP地址
    开启ip forward功能，并让其永久生效
# vim /etc/sysctl.conf
         net.ipv4.ip_forward = 0            #将此行的0参数修改为1，表示开启
    执行sysctl -p 让其生效
上述配置完成后需增加路由，具体操作如下：
route add -net 0.0.0.0 netmask 0.0.0.0 gw 10.30.10.254 dev eth0
route add -net 192.168.0.0 netmask 255.255.255.0 gw 192.168.0.1 dev eth1
   再使用route -n查看路由信息
# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.30.10.0      0.0.0.0         255.255.255.0   U     1      0        0 eth0
169.254.95.0    0.0.0.0         255.255.255.0   U     1      0        0 usb0
192.168.0.0    192.168.0.1    255.255.255.0   UG    0      0        0 eth1
0.0.0.0         10.30.10.254    0.0.0.0         UG    0      0        0 eth0
路由信息己设置OK了，接下来就是进行测试了
可以通过ping 这两个网卡的IP地址，测试是否能正常通讯（其它因素不在本文范围考虑）
C:\Users\fzh>ping 192.168.0.11

Pinging 192.168.0.11 with 32 bytes of data:
Reply from 192.168.0.11: bytes=32 time<1ms TTL=62
Reply from 192.168.0.11: bytes=32 time<1ms TTL=62
Reply from 192.168.0.11: bytes=32 time<1ms TTL=62
Reply from 192.168.0.11: bytes=32 time<1ms TTL=62

Ping statistics for 192.168.0.11:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:\Users\fzh>ping 10.30.10.19

Pinging 10.30.10.19 with 32 bytes of data:
Reply from 10.30.10.19: bytes=32 time=1ms TTL=63
Reply from 10.30.10.19: bytes=32 time<1ms TTL=63
Reply from 10.30.10.19: bytes=32 time<1ms TTL=63
Reply from 10.30.10.19: bytes=32 time<1ms TTL=63

Ping statistics for 10.30.10.19:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 1ms, Average = 0ms

两张网卡地址都能正常ping通，再将路由设置到开启启动脚本里边:
# vim /etc/rc.local
route add -net 0.0.0.0 netmask 0.0.0.0 gw 10.30.10.254 dev eth0
route add -net 192.168.0.0 netmask 255.255.255.0 gw 192.168.0.1 dev eth1

重启下，再测试，OK！！