sniffer_basic.py

sudo python3 sniffer_basic.py 

If running in local machine input the ip address which can be got by running ipconfig on Windows and ipconfig getifaddr en0 on macOS

Open another terminal pick a host to ping.

ping google.com 

Then you should see some garbled output

sniffer_ip_header_decode.py

sudo sniffer_ip_header_decode.py 

Open another terminal pick a host to ping.

ping google.com 

We would be able to see only the response and only for the ICMP protocol

sniffer_with_icmp.py

sudo python3 sniffer_with_icmp.py

Open another terminal pick a host to ping.

ping google.com 

The output actually indicates that the ping (ICMP Echo) responses are being correctly received and decoded

scanner.py

This code scans a specified subnet for active hosts by sending UDP datagrams and listening for ICMP "port unreachable" responses to identify which hosts are up. It prints the IP addresses of responsive hosts within the given subnet

sudo python3 scanner.py 192.168.1.0

# subnet to target: 192.168.1.0/24