Re: [manet] NHDP: Link quality based on seq-num

["Teco Boot" <teco at inf-net.nl>]

>-----Oorspronkelijk bericht-----
>Van: Ulrich Herberg [mailto:ulrich at herberg.name]
>Verzonden: maandag 9 november 2009 23:54
>Aan: Dearlove, Christopher (UK)
>CC: Henning Rogge; manet at ietf.org; Teco Boot
>Onderwerp: Re: [manet] NHDP: Link quality based on seq-num
>
>On Mon, Nov 9, 2009 at 11:51 PM, Dearlove, Christopher (UK)
><Chris.Dearlove at baesystems.com> wrote:
>>> I think what Teco means is that
>>> if NHDP runs on a reliable transport, a very bad link (that needs
>many
>>> retransmissions of HELLOs) still would appear as perfect link to
>NDHP,
>>> because no packetbb packet is lost. So, of course the transport
>>> protocol is transparent to NHDP, but using packet seq. no. as measure
>>> of number of lost packets would not make sense any more.
>>
>> If you have such a reliable transport layer (except I don't
>> believe in it because it's not unicast, but ignore that for
>> now)
>
>I think this was more a theoretical assumption...
>
>> then I would want the retransmission rates from that
>> transport layer as a supplement or replacement to packet
>> sequence number. It's not alone in that - I'd like all the
>> information I can get.
>
>Yes, true. But this would require some cross-layer information. I
>agree that in that case, it would be necessary to get some information
>from the transport protocol.

NACK based reliable multicast does not provide the info that is needed.
But yes, the info that becomes available could be used for MPR selection.

The idea is more serious than theoretical assumption. When the performance
of MANETs degrades due to TC load, we could take a look at this.


Teco.

>
>Ulrich