由安装两块网卡的linux系统中引起网络不通想到的
一天，小王突然急匆匆的来找我，他说：“我在机子上刚装的redhat怎么老也ping不通服务器，我网卡的驱动都安装了，ping 自己的两块网卡的IP都能通，可就时访问不了服务器。我输入[url]http://172.31.0.101[/url]就提示‘当试图与172.31.0.101联系时，连接被拒绝’”
我来到小王的机器前查看了一下网络配置。
[root@rhas root]# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00
inet addr:172.31.0.200 Bcast:172.31.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:68 errors:0 dropped:0 overruns:0 frame:0
TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5560 (5.4 Kb) TX bytes:504 (504.0 b)
Interrupt:10 Base address:0xe800 Memory:d9100000-d9100038
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2041 errors:0 dropped:0 overruns:0 frame:0
TX packets:2041 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:209184 (204.2 Kb) TX bytes:209184 (204.2 Kb)
[root@rhas root]# ping 172.31.0.101
PING 172.31.0.101 (172.31.0.101) 56(84) bytes of data.
64 bytes from 172.31.0.101: icmp_seq=0 ttl=64 time=0.542 ms
64 bytes from 172.31.0.101: icmp_seq=1 ttl=64 time=0.270 ms
--- 172.31.0.101 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1004ms
rtt min/avg/max/mdev = 0.270/0.406/0.542/0.136 ms, pipe 2
[root@rhas root]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
172.31.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 172.31.0.254 0.0.0.0 UG 0 0 0 eth0
[root@rhas root]#
此时访问网络没有问题，故障排除。
未完待续。。。。
本文出自 “李晨光原创技术博客” 博客，请务必保留此出处http://chenguang.blog.51cto.com/350944/69543