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环境简述： 服务器A具备双网卡，安装操作系统RHEL6.3 ---------------------------------------------------------- 网卡显示名称 IP地址 网关 ---------------------------------------------------------- eth0 192.168.153.4 192.168.153.1 eth1 192.168.152.4 192.168.152.1 ----------------------------------------------------------- 网卡配置文件： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 [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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 [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 1 2 3 4 5 6 7 8 [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 1 2 3 4 5 6 7 8 9 [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) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 [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 -------------------------------------------------------------------------------- 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 [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。 (责任编辑：IT) |