TCP重传

TCP重传是什么

如何排查TCP重传

如何监控TCP重传

#!/bin/bash
export PATH='/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin'
SHELLDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
netstat -s -t > /tmp/netstat_s 2>/dev/null
s_r=`cat /tmp/netstat_s | grep 'segments send out' | awk '{print $1}'`
s_re=`cat /tmp/netstat_s  | grep 'segments retransmited' | awk '{print $1}'`
[ -e ${SHELLDIR}/s_r ] || touch ${SHELLDIR}/s_r
[ -e ${SHELLDIR}/s_re ] || touch ${SHELLDIR}/s_re
l_s_r=`cat ${SHELLDIR}/s_r`
l_s_re=`cat ${SHELLDIR}/s_re`
echo $s_r > ${SHELLDIR}/s_r
echo $s_re > ${SHELLDIR}/s_re
tcp_re_rate=`echo "$s_r $s_re $l_s_r $l_s_re" | awk '{printf("%.2f",($2-$4)/($1-$3)*100)}'`
echo $tcp_re_rate