What is firewalking in the context of network security?

What is firewalking in the context of network security?

• A. Banner Guiding
• B. Technique for testing the vulnerability of a firewall and mapping the routers
• C. IP Address Spoofing
• D. Anonymous Website Surfing Sites

Answer: (B)

Firewalking is a network security testing technique used to determine what traffic can pass through a firewall and to map what lies beyond it. By sending probe packets with carefully chosen Time-To-Live values, a tester can trigger responses from routers or devices past the firewall boundary. Those responses reveal which destinations behind the firewall are reachable and which protocols or ports are allowed, effectively helping to chart the firewall rules and the layout of the network beyond the firewall. This is different from banner grabbing, which collects information from services, or IP address spoofing, which is about falsifying a source address, or anonymous browsing, which aims to hide the user’s identity while browsing.

Firewalking is a network security testing technique used to determine what traffic can pass through a firewall and to map what lies beyond it. By sending probe packets with carefully chosen Time-To-Live values, a tester can trigger responses from routers or devices past the firewall boundary. Those responses reveal which destinations behind the firewall are reachable and which protocols or ports are allowed, effectively helping to chart the firewall rules and the layout of the network beyond the firewall. This is different from banner grabbing, which collects information from services, or IP address spoofing, which is about falsifying a source address, or anonymous browsing, which aims to hide the user’s identity while browsing.