(usagi-users 01185) Re: [mipl] 1312 Bytes

[Antti Tuominen <ajtuomin@xxxxxxxxxx>]

Jonas Willen previously wrote:
> Hi!

Hello,

> Have done some comparison on throughput performers between IPv4 IPv6 and
> Mobile IPv6.
> During these test we found that the size of date that was sent over a
> Ethernet link using IPv6 always where 1312 Bytes in size. Using IPv6 or
> Mobile IPv6 the only thing that changes where how many heads that that
> packet was loaded with.
> 
> Looking to draft and RFC I have not found any reference to that why the
> size is set to 1312 Bytes. Is it implantation specific and if so why?

Our Mobile IPv6 implementation reserves a fixed size block (128 bytes)
of the packet, so it can always fit any combination of MIPv6 signaling
in the packet.  This is of course wasteful and stupid, but it was the
easiest way to do it and we didn't get any better suggestions from
Linux netdev at the time.  We are trying to change it so MIPv6
destination options are only piggy-backed when there is room.  We
still need to reserve space for Home Address Option or Routing Header,
though.

Regards,

Antti

-- 
Antti J. Tuominen, JMT 3A 133, FIN-02150 Espoo, Finland.
Research assistant, TSE Institute at Helsinki University of Technology
work: ajtuomin@xxxxxxxxxx; home: tuominen@xxxxxx