Mastering the sendip Command: How to Setup, Execute, and Analyze Network Packets

Step 1: Install sendip tool

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sudo apt-get updatesudo apt-get install sendip

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man sendip   //You can view the usage of sendip

Step 2: Usage

Set up two virtual machines, execute the sendip command on one, and use the other to capture and analyze packets.

sendip command format: sendip network layer transport layer data domain sendip -v -p *** -is *** -id *** -p *** -f/-d ***** domain

Common command parameters: -v Print out the entire data packet being sent. -p Specify the network protocol to use. -is Source address -id Destination address domain The first hop route -d Data to be carried. Use parameter rN to generate N random bytes. -f Read the data to carry from a file.

“Use the sendip command to send a packet from the command line”

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sendip -v  -p ipv4 -is 192.168.163.128 -id 192.168.163.130 -p tcp -f message 192.168.163.130

You can also write a script:

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vim send.sh

Edit content:

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#!/bin/bashcd /home/lxm/Desktop/send_1(){while truedo        sendip -v  -p ipv4 -is 192.168.163.128 -id 192.168.163.130 -p tcp -f message 192.168.163.130        sleep 0.001done}send_2(){while truedo        sendip -v -p ipv4 -is 192.168.163.128 -id 192.168.163.130  -p udp -f message 192.168.163.130        sleep 0.01done}send_3(){while truedo        sendip -v -p ipv4 -is 192.168.163.128 -id 192.168.163.130 -p icmp -d data01234567 192.168.163.130        sleep 0.1done}send_1 & send_2 & send_3

Create a custom content file

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vim message

Execute the script:

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./send.sh

Use Wireshark on the receiving end virtual machine to intercept the following data packet:

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