[e2e] Legal fragment sizes

Jeno Jeno su.jeno at gmail.com
Wed May 17 03:01:29 PDT 2006


The fragment-offset field is just 13-bits. So you cannot
specify a fragment offset of ~64k.

On 5/16/06, Fernando Gont <fernando at gont.com.ar> wrote:
>
> Folks,
>
> I was going through the IP specs, and there was a point on which
> there seems to be some ambiguity (or, well, at least it's not that
> clear to me). I wonder what your interpretation is.
>
> Is the maximum "legal" IP payload defined by "Total_Length -
> IP_Header" (i.e., around 65K), or should it be considered to be the
> maximum payload that can be encapsulated, by using the "trick"
> described bellow? (i.e., which would then result in a maximum payload
> size of around 128K)
>
> (The "trick" would be to send a ~65K fragment with the MF bit set,
> followed by a second 65K fragment with an offset of ~65K)
>
> Thanks!
>
> --
> Fernando Gont
> e-mail: fernando at gont.com.ar || fgont at acm.org
> PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1
>
>
>
>
>
>
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