Field Name

Size (bytes)

Description

Next Header

1

Next Header: Contains the protocol number of the next header after the Routing header. Used to link headers together as described above.

Hdr Ext Len

1

Header Extension Length: The length of the Routing header in 8-byte units, not including the first 8 bytes of the header. For a Routing Type of 0, this value is thus two times the number addresses embedded in the header.

Routing Type

1

Routing Type: This field allows multiple routing types to be defined; at present, the only value used is 0.

Segments Left

1

Segments Left: Specifies the number of explicitly-named nodes remaining in the route until the destination.

Reserved

4

Reserved: Not used; set to zeroes.

Address1 … AddressN

Variable (multiple of 16)

Addresses: A set of IPv6 addresses that specify the route to be used.