Re: IPv6 minimum Link MTU

Hi Joe,

  Got it and thanks for addressing the answer referring to the RFC for
IPv4.What about IPv6,is it on similiar lines.( I think,the basic header of
ipv6 is 40 octets and it has options for extension headers,so adding both
may come to close around 1280 octets ?)

  Thank You

Regards
Anantha Subramanian Natarajan

On Thu, Aug 27, 2009 at 1:29 AM, Joe Astorino <jastorino_at_ipexpert.com>wrote:

> To answer your question about IPv4, from RFC791 (IP)
>
> "Every internet module must be able to forward a datagram of 68
> octets without further fragmentation. This is because an internet
>
> header may be up to 60 octets, and the minimum fragment is 8 octets.
>
> Every internet destination must be able to receive a datagram of 576
> octets either in one piece or in fragments to be reassembled."
>
>
> On Thu, Aug 27, 2009 at 2:04 AM, Anantha Subramanian Natarajan <
> anantha.natarajan_at_gravitant.com> wrote:
>
>> Hi All,
>>
>> When I was going through the Doc CD for IPv6,I read about the "Minimum
>> Link MTU is 1280 octets in IPv6".Even when referred the RFC 2460 (IPv6
>> specification),it highlights the same.I am just curious about the
>> significance of that number "1280 octets".How that is derived ?.Even I
>> didn't know,what is the significance of the number 68 octets,which is
>> minimum MTU size for Ipv4 .
>>
>> Any clarification is really appreciated.
>>
>> Thanks for the help
>>
>> Regards
>> Anantha Subramanian Natarajan
>>
>>
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> --
> Regards,
>
> Joe Astorino - CCIE #24347 R&S
> Technical Instructor - IPexpert, Inc.
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Received on Thu Aug 27 2009 - 01:42:05 ART