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protocol type

The protocol type field is a data field in the header oftransport protocols. It indicates to which transport or control protocol the payload of the corresponding protocol belongs.

Protocol numbers for the

Protocol numbers for the

protocol type field In the IP header, the protocol type field comprises 8 bits and is used for demultiplexing incoming datagrams. The protocol type defines the subsequent protocol of the next higher layer, i.e. the transport protocol. The most important protocol types are the ICMP protocol(encoding 1), IGMP protocol (2), TCP protocol (6), EGP protocol (8) and the UDP protocol (17).

The encodings for the higher protocols are published in the Assigned Numbers.

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Englisch: protocol type
Updated at: 27.12.2010
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