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 A newer version of the protocol, not yet in widespread deployment, is version 6 (IPv6), sometimes referred to as“ next-generation IP”(IPng).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 ...
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