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IPV6 and IPV4 anycast

1- Does IPV4 have anycast ?

http://www.ietf.org/rfc/rfc1546.txt

http://book.itzero.com/read/cisco/0...15lev1sec3.html

" Anycasting, however, is a completely new concept that is unique to IPv6 "

http://tools.ietf.org/html?rfc=2526

2- "TCP/IP Protocol Suite" Book, third edition by Forouzan says:

"Anycast address defines a group of computers with addresses that have the same prefix.

For example, all computers connected to the same physical network share the same prefix address. A packet sent to an anycast address must be delivered to exactly one of the members of the group- the closet or the easily accessible-.".

In another Book "Data Communications and Networking" 3th Edition he mentioned same thing Chapter 20 page 531 :

"An anycast address defines a group of computers with addresses that have the same prefix. For example, all computers connected to the same physical network share the same prefix address. A packet sent to anycast address must be delivered to exactly one of the members of the group-the closest or the most easily accessible"

I am looking to understand the phrase (same prefix, and same physical network)

1 REPLY
Community Member

Re: IPV6 and IPV4 anycast

Hi,

Anycast is supported on IPv4, basically duplicate loopback addresses are configured on different devices located on different subnets.

As an example of this there is an application note autored by Cisco describing the use of anycast IP addresses on Rendevouz Points.

http://www.cisco.com/en/US/tech/tk828/technologies_white_paper09186a00800d6b60.shtml

Regards.

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