Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Next Header (8 bits)

The Next Header field identifies the next header’s type. If an Extension header is used, this field contains the type of Extension header (as shown in the following table). If the next header is a transmission control protocol (TCP) or user datagram protocol (UDP) header, the value in this field is the same as for IPv4. The Extension header is located between the IP header and the TCP or UDP header.

The following lists the Next Header field values.

Value	Description
0	Hop-by-Hop option header
4	IPv4
6	TCP
8	Exterior Gateway Protocol (EGP)
41	IPv6
43	Routing header
44	Fragmentation header
50	Encrypted Security
51	Authentication header
59	No Next Header
60	Destinations option header

NOTE: This table is not a comprehensive list of Next Header field values. For a complete and current listing, refer to the Internet Assigned Numbers Authority (IANA) web page.