C-1Appendix CUnderstanding IP AddressingThis appendix is a brief general introduction to IP addressing. Abasic understanding of IP will help you in configuring the NetopiaISDN Router and using some of its powerful features, such as staticroutes and packet filtering.In packets, a header is part of the envelope information thatsurrounds the actual data being transmitted. In e-mail, a header isusually the address and routing information found at the top ofmessages.What is IP?All networks use protocols to establish common standards forcommunication. One widely used network protocol is the InternetProtocol, also known as IP. Like many other protocols, IP usespackets, or formatted chunks of data, to communicate.Note: This guide uses the term “IP” in a very general and inclusiveway, to identify all of the following:n Networks that use the Internet Protocol, along withaccompanying protocols such as TCP, UDP, and ICMPn Packets that include an IP header within their structuren Devices that send IP packets
