针对RHEL中双网卡IP不能同时被访问的解决方法

环境简述：

服务器A具备双网卡，安装操作系统RHEL6.3

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网卡显示名称 IP地址 网关

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eth0 192.168.153.4 192.168.153.1

eth1 192.168.152.4 192.168.152.1

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网卡配置文件：

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[root@clovem ~] # cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 ONBOOT= yes BOOTPROTO=static TYPE=Ethernet IPADDR=192.168.153.4 NETMASK=255.255.255.0 GATEWAY=192.168.153.1 [root@clovem ~] # cat /etc/sysconfig/network-scripts/ifcfg-eth1 DEVICE=eth1 ONBOOT= yes BOOTPROTO=static TYPE=Ethernet IPADDR=192.168.152.4 NETMASK=255.255.255.0 GATEWAY=192.168.152.1

重启网络服务

[root@clovem ~]# service network restart

查看其路由信息：

[root@clovem ~]# route

Kernel IP routing table

Destination Gateway Genmask Flags Metric Ref Use Iface

192.168.153.0 * 255.255.255.0 U 0 0 0 eth0

192.168.152.0 * 255.255.255.0 U 0 0 0 eth1

link-local * 255.255.0.0 U 1015 0 0 eth0

link-local * 255.255.0.0 U 1016 0 0 eth1

default 192.168.152.1 255.255.255.0 UG 1017 0 0 eth1

可以发现双网卡的默认网关为192.168.152.1

从其他网段192.168.151.0/24的某台测试机:192.168.150.252

访问192.168.153.4以及192.168.152.4 ,只能通过192.168.152.4进行网络连接，而192.168.153.4却不可以，从上面的路由表中可以看出两个网卡配置文件中的网关参数只有192.168.152.1生效，并被设置为默认网关。

解决方法：

1.将两个网卡配置文件中的GATEWAY参数全部删除，即

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[root@clovem ~] # cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 ONBOOT= yes BOOTPROTO=static TYPE=Ethernet IPADDR=192.168.153.4 NETMASK=255.255.255.0 [root@clovem ~] # cat /etc/sysconfig/network-scripts/ifcfg-eth1 DEVICE=eth1 ONBOOT= yes BOOTPROTO=static TYPE=Ethernet IPADDR=192.168.152.4 NETMASK=255.255.255.0

2. 重启网络

[root@clovem ~]# service network restart

3.查看路由表

[root@clovem ~]# route

Kernel IP routing table

Destination Gateway Genmask Flags Metric Ref Use Iface

192.168.153.0 * 255.255.255.0 U 0 0 0 eth0

192.168.152.0 * 255.255.255.0 U 0 0 0 eth1

link-local * 255.255.0.0 U 1015 0 0 eth0

link-local * 255.255.0.0 U 1016 0 0 eth1

发现默认网关没有被设置

4. 添加静态路由表

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[root@clovem ~] # echo "153 net_153" >>  /etc/iproute2/rt_tables [root@clovem ~] # echo "152 net_152" >>  /etc/iproute2/rt_tables [root@clovem ~] # ip  route flush table net_153 [root@clovem ~] # ip  route add default via 192.168.153.1 dev  eth0 src 192.168.153.4   table net_153 [root@clovem ~] # ip  rule  add from 192.168.153.4 table net_153 [root@clovem ~] # ip  route flush table net_152 [root@clovem ~] # ip  route add default via 192.168.152.1 dev  eth0 src 192.168.153.4   table net_152 [root@clovem ~] # ip  rule  add from 192.168.152.4 table net_152

5. 此时再次通过外部测试机访问均可

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[root@storage252 ~] # ifconfig  eth0 eth0      Link encap:Ethernet  HWaddr 00:50:56:82:56:55            inet addr:192.168.150.252  Bcast:192.168.150.255  Mask:255.255.255.0            inet6 addr: fe80::250:56ff:fe82:5655 /64  Scope:Link            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1            RX packets:25910143 errors:0 dropped:0 overruns:0 frame:0            TX packets:19888495 errors:0 dropped:0 overruns:0 carrier:0            collisions:0 txqueuelen:1000            RX bytes:26258149440 (24.4 GiB)  TX bytes:16323278977 (15.2 GiB)

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[root@storage252 ~] # ping -W1 -c2 192.168.152.4 PING 192.168.152.4 (192.168.152.4) 56(84) bytes of data. 64 bytes from 192.168.152.4: icmp_seq=1 ttl=63  time =0.324 ms 64 bytes from 192.168.152.4: icmp_seq=2 ttl=63  time =0.349 ms --- 192.168.152.4  ping  statistics --- 2 packets transmitted, 2 received, 0% packet loss,  time  1000ms rtt min /avg/max/mdev  = 0.324 /0 .336 /0 .349 /0 .022 ms [root@storage252 ~] # ping -W1 -c2 192.168.153.4 PING 192.168.153.4 (192.168.153.4) 56(84) bytes of data. 64 bytes from 192.168.153.4: icmp_seq=1 ttl=63  time =0.342 ms 64 bytes from 192.168.153.4: icmp_seq=2 ttl=63  time =0.271 ms --- 192.168.153.4  ping  statistics --- 2 packets transmitted, 2 received, 0% packet loss,  time  999ms rtt min /avg/max/mdev  = 0.271 /0 .306 /0 .342 /0 .039 ms

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最后还需要添加一条默认网关，才能让该系统访问其他网段主机

1	[root@clovem ~] # route add default gw 192.168.153.1

可以根据需要将静态路由命令添加至相关配置文件，重启之后仍然生效。

本文转自 暗黑魔君 51CTO博客，原文链接：http://blog.51cto.com/clovemfong/1272075，如需转载请自行联系原作者