How to do TCPDUMP

How to do TCPDUMP

::: RefUrl 
    → https://www.tecmint.com/12-tcpdump-commands-a-network-sniffer-tool/
    → https://linuxtechlab.com/learn-use-tcpdump-command-examples/
    → https://www.thegeekstuff.com/2010/08/tcpdump-command-examples


  
::: Install TCPdump command → yum install tcpdump 

::: To write tcpdump from 'server_A'(eth0) IP to 'server_B' 
    → tcpdump -w fileName.pcap server_A_ip -i eth0 server_B_ip 

::: Example : 
    Suppose , we want to get the Tcp-Dump from eth0 to 192.168.22.22 and store the it to a file.
    For this we have to run the below command :
    
    → tcpdump -w test_v2.pcap -A -i eth0 dst 192.168.22.22
    
    → The 'test_v2.pcap' is a wireshark file.
    → Need to have wireshark installed for opening the file.
    → 'test_v2.pcap' → will be available on centos path → '/root/'

To Check the eth0 IP address, we need to run the below COMMAND
→ cat /etc/sysconfig/network-scripts/ifcfg-eth0