O'Reilly logo

Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

The IP Packet Header

Figure 2.2 shows the format of the IP packet header, specified in RFC 791. Most fields in this packet have some importance to routing.

Figure 2.2. The IP packet protocol.

Version identifies the I P version to which the packet belongs. This four-bit field is usually set to binary 0100; version 4 (IPv4) is in current, common use. A newer version of the protocol, not yet in widespread deployment, is version 6 (IPv6), sometimes referred to as“ next-generation IP”(IPng). All currently assigned version numbers can be seen in Table 2.1, along with a few of the relevant RFCs. All versions other than 4 and 6 (built on ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required