B-1. IP Protocol Numbers
A higher-layer protocol is identified with an 8-bit field within an IPv4 packet called Protocol. The IPv4 header format is shown in Figure B-1 with the Protocol field shaded. Figure B-2 shows the IPv6 header format where the protocol number is stored in the shaded Next Header field.
Figure B-1. IPv4 Header Format Showing the Protocol Field
Figure B-2. IPv6 Base Header Format Showing the Next Header Field
Well-known or assigned IP protocols are registered with the Internet Assigned Numbers Authority (IANA). The information ...
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