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Capture PCAP file in LInux

 For Capture network interface pcap manually 

you need to install tcpdump using below mention command.

Centos 7

yum install tcpdump -y 
tcpdump -w filename.pcap -i adapter_name
 
Example for eth1 interface pcap capture 
tcpdump -w trace.pcap -i eth1 
 

You can use sngrep as well 

sngrep install centos 7 linux

First of all, add the irontec repository to centos Repos. Create file named sngrep.repo  in /etc/yum.repos.d  folder and add the following repository to install sngrep.

nano  /etc/yum.repos.d/sngrep.repo 

Now add the following repository.

Then Import the Irontec repositories public key using the following command.

rpm --import http://packages.irontec.com/public.key

Now update the yum cache and install the sngrep using the following command.

yum update

yum install sngrep

 

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