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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)
      9  TCP/IP Internet Layer (OSI Network Layer) Protocols
           9  Internet Protocol (IP/IPv4, IPng/IPv6) and IP-Related Protocols (IP NAT, IPSec, Mobile IP)
                9  Internet Protocol Version 6 (IPv6) / IP Next Generation (IPng)
                     9  IPv6 Datagram Encapsulation and Formatting

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IPv6 Datagram Main Header Format
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4
56
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IPv6 Datagram Options
Next Topic/Section

IPv6 Datagram Extension Headers
(Page 4 of 6)

IPv6 Routing Extension Header

The Routing extension header is used to perform source routing in IPv6. It is described in Table 71, and illustrated in Figure 107.


Table 71: IPv6 Routing Extension Header Format

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.



Figure 107: IPv6 Routing Extension Header Format

 


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