清除/proc/net/ip_conntrack的方法

/proc/net/ip_conntrack一直显示已经被封掉的连接，如果不reboot，要5天后才会清除，给监控造成很大影响，后来在Mailing Lists找到解决办法:

 

iptstate -s -t  #显示IP连接状态

下载hping:


./configure
make
make install

安装后写一个script:

#!/bin/bash

echo
echo "############################"
echo "# Edit by Youngh 2003.06.24 v1.1 "
echo "# Usage : clr_conns IpAddress"
echo "# This will clear all connections from this IP_Address"
echo "# Example:/root/clr_conns 10.0.3.3 "
echo "############################"
echo

if [ -z $1 ] ; then
exit
fi

grep -E "^tcp .{10,25}ESTABLISHED src=$1 " /proc/net/ip_conntrack | while read line ; do
S_IP=`echo $line | awk '{print substr($5,5)}'`
S_SOCK=`echo $line | awk '{print substr($7,7)}'`
D_IP=`echo $line | awk '{print substr($6,5)}'`
D_SOCK=`echo $line | awk '{print substr($8,7)}'`
echo "$S_IP:$S_SOCK $D_IP:$D_SOCK"

hping2 $D_IP -R -s $S_SOCK -p $D_SOCK -a $S_IP -k -c 1 >/dev/null 2>/dev/null &

done

保存为clr_conns.sh

用:

sh clr_conns.sh x.x.x.x

就可以清除显示的连接.