AppendixA.Well-Known Protocol and Port Numbers

Appendix A. Well-Known Protocol and Port Numbers

This appendix presents tables of well-known TCP/IP information that can be used in firewall configuration. Only the protocol and port numbers that have corresponding Cisco firewall configuration keywords are shown. These tables should provide a quick reference when you need a keyword or when you need to decipher other information from a keyword given by the firewall.

TIP

All well-known or assigned TCP/IP information is registered with the Internet Assigned Numbers Authority (IANA). For the most current number assignment information, go to http://www.iana.org/numbers.htm.

Another very handy source of networking information is the RFC Sourcebook, maintained by Network Sorcery, Inc. This website is a one-stop quick reference directory for RFCs, IP protocols, UDP and TCP ports, and more. You can find it at http://www.networksorcery.com/enp/default.htm.