Testing routers with Firewalk

Firewalk is a network security reconnaissance tool that helps us figure out whether our routers are actually doing the job they are supposed to do. Firewalk attempts to find which protocols a router or firewall will allow and which it will block.

This tool is incredibly useful during pentesting, and can help you verify and validate firewall policies in a corporate environment. In this recipe, we will learn about using Firewalk.

How to do it...

1. If firewalk is not installed, we can install it by typing the following:

apt install firewalk

The following screenshot shows the output of the preceding command:

2. We can use the following command to run firewalk:

firewalk -S 1-23 -i eth0 192.168.1.1...