Checksums are used by the TCP/IP protocol to ensure the data integrity.However sending packets with incorrect checksums can help you to discover information from systems that is not properly configured or when you are trying to avoid a firewall.

You can use the command nmap --badsum IP in order to send packets with bad checksums to your targets.In the image below we didn’t get any results.This means that the system is suitable configured.


nmap --badsum 192.168.8.105