Browse Prior Art Database

Method to discover Realm Specific IP server in multicast and broadcast networks using ICMP

IP.com Disclosure Number: IPCOM000028927D
Original Publication Date: 2004-Jun-08
Included in the Prior Art Database: 2004-Jun-08
Document File: 5 page(s) / 35K

Publishing Venue

IBM

Abstract

Realm Specific IP (RSIP) is a new architecture that is positioned to replace Network Address Translation (NAT) used for partitioning the network address space for reasons like shortage of IP V4 addresses and hiding the internal network details etc.,

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Method to discover Realm Specific IP server in multicast and broadcast networks using ICMP

Message Formats

The existing format specification of ICMP Router advertisement and Solicitation messages are as follows. The suggested changes to code field and semantics for other fields are indicated in blue .

ICMP Router Advertisement Message/ICMP RSIP Server Advertisement Message

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Type | Code | Checksum |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Num Addrs |Addr Entry Size| Lifetime |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Router Address[1] |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Preference Level[1] |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Router Address[2] |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Preference Level[2] |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| . |

| . |

| . |

IP Fields:

Source Address An IP address belonging to the interface

from which this message is sent.

Destination Address The configured AdvertisementAddress or the

IP address of a neighboring host.

This will be multicast all host address

(224.0.0.1) when it is used for RSIP Server

advertisement

OR

This will be the multicase group address for which

this RSIP server is the group leader

OR

This will be the unicast address of the client

from which server received server solicit message

Time-to-Live 1 if the Destination Address is an IP

multicast address; at least 1 otherwise.

ICMP Fields:

Type 9

Code 0

1 RSIP Server Advertisement

1

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Checksum The 16-bit one's complement of the one's

complement sum of the ICMP message, start-

ing with the ICMP Type. For computing the

checksum, the Checksum field is set to 0.

Num Addrs The number of router addresses advertised

in this message.

Number of RSIP Server addresses advertised in this

message.

Addr Entry Size The number of 32-bit words of information

per each router address (2, in the version

of the protocol described here).

The number of 32-bit words of information per each

RSIP Server address. It will always be 1 in the

case of messages with code=1 (RSIP Server

advertisement)

Lifetime The maximum number of seconds that the

router addresses may be considered valid.

The maximum number of seconds that the

RSIP Server address may be considered valid.

Router Address[i], The sending router's IP address(es) on the

i = 1..Num Addrs interface from which this message is sent.

The sending RSIP Server's IP address(es) on the

interface from which this message is sent.

Preference Level[i], The preferability of each Router Address[i]

i = 1..Num Addrs as a default router address, relative to

other router addresses on the same subnet.

A signed, twos-complement value; higher

values mean more preferable.

Currently Not used in the case...