linux MTU过大导致无法远程top,vi等操作

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1.故障现象

使用xshell远程linux的时候,在使用top,vi,sar等命令的时候xshell直接卡死,按ctrl c也无法终止,只能强行关闭窗口重连.

2.故障分析

经过百度搜索发现是可能是网卡的MTU过大导致.查看当前网卡的MTU:

[root@dsg network-scripts]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:50:56:96:29:7C  
          inet addr:192.168.10.15  Bcast:192.168.10.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:fe96:297c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4441 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3370 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:424285 (414.3 KiB)  TX bytes:528979 (516.5 KiB)

MTU的配置文件在:

[root@dsg network-scripts]# cat /sys/class/net/eth0/mtu 
1500

3.故障解决

直接修改配置文件:

[root@dsg network-scripts]# echo 1400 >/sys/class/net/eth0/mt

重新查看mtu:

[root@dsg network-scripts]# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:50:56:96:29:7C  
          inet addr:192.168.10.15  Bcast:192.168.10.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:fe96:297c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1400  Metric:1
          RX packets:36 errors:0 dropped:0 overruns:0 frame:0
          TX packets:23 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:3230 (3.1 KiB)  TX bytes:2694 (2.6 KiB)

修改完成之后故障解决.

4.故障总结

参考MTU的百度百科:

http://baike.baidu.com/link?url=kkt1AZcAnL5UR8-WML_WoE-Nfg1M5dGg-Q4enobBPbhhHoBqj7LlYGqMwCNsPv8FTH7yhj6Kw05Xgdg8pBsQG_

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