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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 Control Message Protocol (ICMP/ICMPv4 and ICMPv6)
                9  ICMP Message Types and Formats
                     9  ICMP Version 6 (ICMPv6) Informational Message Types and Formats

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ICMPv6 Redirect Messages
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ICMPv6 Informational Message Options
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ICMPv6 Router Renumbering Messages
(Page 2 of 2)

ICMPv6 Router Renumbering Message Format

The format of Router Renumbering messages is in Table 114 and Figure 163.


Table 114: ICMPv6 Router Renumbering Message Format

Field Name

Size (bytes)

Description

Type

1

Type: Identifies the ICMPv6 message type; for Router Renumbering messages the value is 138.

Code

1

 

Checksum

2

Checksum: 16-bit checksum field for the ICMP header, as described in the topic on the ICMP common message format.

Sequence Number

4

Sequence Number: A 32-bit sequence number used to guard against “replay” attacks by allowing a recipient to detect stale, duplicate or “out of order” commands.

Segment Number

1

Segment Number: Differentiates between valid Router Renumbering messages within the same Sequence Number.

Flags

1

 

Max Delay

2

Maximum Delay: Tells a router receiving a message the maximum amount of time (in milliseconds) it is allowed to delay before sending a reply.

Reserved

4

Reserved: 4 reserved bytes.

Message Body

Variable

Message Body: For a Router Renumbering Command, the message body contains two sets of information. The first is a Match-Prefix Part for the prefix being renumbered. The second is one or more Use-Prefix Parts that describe the new prefix for each match. A router receiving a Command checks its own interface addresses and if they match the Match-Prefix-Part, they use Use-Prefix Parts data to accomplish the renumbering.

For a Router Renumbering Result, the message body contains zero or more Match Results entries that describe each prefix that a router matched from a Router Renumbering Command. Each entry provides information regarding whether renumbering was successful or not for a prefix.



Figure 163: ICMPv6 Router Renumbering Message Format

 


Addressing of Router Renumbering Messages

Since these messages are intended for all routers on a site, they are normally sent to the “all routers” multicast address, using either link-local or site-local scope. They may also be sent to local unicast addresses.


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