最近自己公司网站老出现掉包问题之前以为是网络问题或机房问题，经过N久的排查发现是linux网卡掉包了，下面我来分享我的解决办法。

 

之前公司的系统由于网卡问题，经常出现掉包（掉包排除攻击的 因素）或者突然挂掉，

严重影响服务的正常提供，因此想在出现此问题时自动解决。

思路：对网卡检测掉包情况，或者用ping检测，出现了，就重启哈网卡 。瞧是很简单吧！

代码如下：

代码如下

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#安装帮助： mkdir  /cyc #/cyc/renetwork.log为日志文件   #!/bin/bash # 2013-2-17 @凹凸曼 # ping timeout  restart network # lastmodtime 2013-3-19 pingNetwork(){         local c=$1         local pcount=$2         local dst=192.168.0.143    #修改为你的交互机或者ip         if [[ ! $pcount =~ ^[0-9]+$ ]];then                 pcount=5         fi         loss=`ping -c $pcount  $dst|grep loss|awk '{print $6}'|cut -d% -f 1 `         if [[ ! $loss =~ ^[0-9]+$ ]];then                 loss=100         fi           if [ $loss -gt 0 ]; then                 ifdown $c                 sleep 3                 ifup $c                 echo `date "+%Y%m%d %T"`": $pcount ping $loss% loss">>/cyc/renetwork.log                 sleep 30         fi   }   #start dst eth stopEth(){         local c=$1         local et=`service network status |tail -1|grep "$c"`           if [ x"" == x"$et" ]; then                 ifup $c                 echo `date "+%Y%m%d %T"`":$c stop">>/cyc/renetwork.log                 sleep 30         fi } #drop found NetDrop(){         local c=$1         #$6 RX-DRP         local redp=`netstat -i|grep "$c"|awk 'END{print $6}'`         #$10 TX-DRP         local txdp=`netstat -i|grep "$c"|awk 'END{print $10}'`           if [ $redp -gt 0 ];then                 ifdown $c                 sleep 3                 ifup $c                 echo `date "+%Y%m%d %T"`":$c RX-DRP drop">>/cyc/renetwork.log                 sleep 30         fi           sleep 2     if [ $txdp -gt 0 ];then                 ifdown $c                 sleep 3                 ifup $c                 echo `date "+%Y%m%d %T"`":$c TX-DRP drop">>/cyc/renetwork.log                 sleep 30         fi   }   wtime=$2 eth=$1 if [[ ! $wtime =~ ^[0-9]+$ ]];then   wtime=3 fi if [ x"" == x"$eth" ];then         echo "please enter the NIC name!"         exit fi while [ 1 ]         do           stopEth $eth         sleep $wtime         NetDrop $eth         sleep $wtime         pingNetwork $eth 1   done

程序运行至目前的日志结果如下：

代码如下

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20130319 12:23:01: eth0 1 ping 100% loss 20130319 13:43:50: eth0 1 ping 100% loss 20130319 18:11:18: eth0 1 ping 100% loss 20130323 08:04:59: eth0 1 ping 100% loss 20130323 14:41:04: eth0 1 ping 100% loss 20130324 12:49:04: eth0 1 ping 100% loss 20130327 13:15:47: eth0 1 ping 100% loss 20130401 11:17:42: eth0 1 ping 100% loss 20130402 09:02:14: eth0 1 ping 100% loss 20130403 08:49:30: eth0 1 ping 100% loss 20130404 20:21:46: eth0 1 ping 100% loss 20130407 18:44:57: eth0 1 ping 100% loss 20130408 10:46:53: eth0 1 ping 100% loss 20130408 14:41:06: eth0 1 ping 100% loss 20130408 14:47:24: eth0 1 ping 100% loss 20130408 15:23:02:eth0 RX-DRP drop 20130415 08:30:09: eth0 1 ping 100% loss 20130415 11:16:16: eth0 1 ping 100% loss 20130417 08:05:41: eth0 1 ping 100% loss 20130419 08:04:19: eth0 1 ping 100% loss 20130419 10:40:51: eth0 1 ping 100% loss 20130419 11:33:14: eth0 1 ping 100% loss 20130419 19:03:03: eth0 1 ping 100% loss 20130421 16:10:55: eth0 1 ping 100% loss 20130422 07:47:34: eth0 1 ping 100% loss 20130423 07:15:07: eth0 1 ping 100% loss

呵呵，自动解决了网卡掉包或挂掉的烦恼！您是不是很爽！

忘记了说鸟，此程序运行环境Red Hat Enterprise Linux Server release 5.4或者Centos6.3

其他环境估计问题不大，这里就不测试鸟！