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IPv4 uses a Variable length header which allows 40 bytes of optional
information after the basic part of the header, but that way
of supporting options has not been successful for various reasons like
performance penalty incurred and the 40 byte limit.
In IPv6 the same is supported as extension headers which can be
present or not depending on what type of packet you are sending. Hop by Hop
options header is one of extension header's which is present immediately after
the IPv6 Header which supports carrying large packets up to 4GB. The basic part
of the header limits the size to 16bits. This option header carries 32bit
payload length field for such large packets. Also it supports Router Alert
Option which is used to indicate to the router that the contents of the packet
require additional processing.
Refer RFC2460 for further details.
>>> "Venkat Bandaaru" <[EMAIL PROTECTED]> 08/30/01
06:50AM >>>
Hi , I am new to networking, and my work is related to ipv6 development. I have a basic question, why do we need the hop-by-hop extension header. If you feel this is a silly question to ask in the forum , please provide me some source from where I can understand all the things. Thanks and Regs -Venkat ============================================================================ This email and any files transmitted with it are confidential and are intended solely for the use of the individual or entity to which they are addressed. Access to this e-mail by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited. -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] -------------------------------------------------------------------- |
- Need some inputs Venkat Bandaaru
- Bhuvaneshwar hn
