nc

one time connect

method1:

server：echo test_message | nc -l -p 1234 -w 1
client：echo "hha" | nc 193.168.141.33 1234

method2:

server：echo test_message | nc -l -p 1234 -w 1
curl -i 193.168.141.33:1234

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#!/bin/bash

mark=1
clientip=10.8.0.6
backendip=192.168.14.31

for i in `egrep -v "^#|^$" /etc/services | awk '{print $2}'| awk -F"/" '{print $1}'`
do
    echo "-----------------" + $mark + "start---------------------"
    echo "connectclient" | nc -l $i &
    echo $i
    ssh root@$clientip -C "echo connectbackend |nc $backendip $i >> /root/temp"
    mark=$(($mark+1))
    if [ $(($mark%1000)) -eq 0 ]
    then
        read -p "please input"
    fi
    echo "-----------------" + $mark + "end---------------------"
done

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