Hands-On Penetration Testing with Kali NetHunter

ACK scans

Another interesting method of scanning is enabling the ACK flag within a packet. This technique is used to determine any form of filtering that may be performed by a network security device, such as a firewall.

While we haven't talked about firewalls yet, we are going to a little later. However, for right now, we will say that firewalls perform filtering of traffic from one network to another (for example, the internet to your local intranet

During a penetration test, we may be on the external network of the organization, such as the internet. Most organizations deploy a firewall at their perimeter, between the internet and their local area network (LAN) to help prevent any threats from entering or leaving their network. We can ...