The following debugging tools are used:
- ICMP ping scan: When checking any device on a network, the first thing that comes to mind is to test ICMP-based scanning. The way it works is that you send an ICMP request packet and expect ICMP echo to reply. The basic idea behind this is to get the live host on the network and then launch a port scanner against those live hosts. Angry IP Scanner is a very popular tool used for network scanning. The problem with ICMP is a network administrator can block ICMP on the network or host layers. You can also easily create a script for an IP scanner which can scan IPs for their defined range.
- TCP ping scan: We have learned that ICMP can be blocked and is therefore not very reliable nowadays. ...
