Design specification for Path MTU Discovery

Hello all,

Can any body provide me any design specification for Path MTU
Discovery, or how others are implementing.

It will be gr8 help for me. Thanx in advance.

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Rajat wrote:
> Hello all,
>
> Can any body provide me any design specification for Path MTU
> Discovery, or how others are implementing.
>
> It will be gr8 help for me. Thanx in advance.

Send ICMP echo request packets out to your target destination, and read
the ICMP reply back. Each ICMP echo request packet should have
- - the "Dont Fragment" bit set, and
- - a fixed-length payload

Each time you get an ICMP error of "Must fragment but DF set", you
reduce the payload size and send another echo request. Once you get an
ICMP echo reply back, you've established your MTU

- --

Lew Pitcher, IT Consultant, Enterprise Application Architecture
Enterprise Technology Solutions, TD Bank Financial Group

(Opinions expressed here are my own, not my employer's)
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