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Scan for open ports by using network scanning and analysis tools such as the following:

 Scan network ports with NetScanTools Pro or Nmap (https://nmap.org). See Chapter 9 for details.

 Monitor network traffic with a network analyzer, such as Omnipeek (www.liveaction.com/products/omnipeek-network-protocol-analyzer/) or Wireshark (www.wireshark.org). I cover this topic in various chapters of this book.

Scanning internally is easy. Simply connect your PC to the network, load the software, and fire away. Just be aware of network segmentation and internal IPSes that may impede your work.

Scanning from outside your network takes a few more steps. The easiest way to connect and get an outside-in perspective is to assign your computer a public IP address and plug that system into a switch on the public side of your firewall or router. Physically, the computer isn’t on the Internet looking in, but this type of connection works the same way as long as it’s outside your network perimeter. You can also do an outside-in scan from home, from a remote office, or even via a laptop connected to your cellphone hotspot.