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

[Ulrich Herberg <ulrich at herberg.name>]

On Mon, Nov 9, 2009 at 11:37 PM, Henning Rogge
<henning.rogge at fkie.fraunhofer.de> wrote:
> On Mon November 9 2009 15:31:16 Teco Boot wrote:
>> What if someone defines a reliable transport and suppress
>> repeating messages?
>> Are we sure we want to use missing sequence numbers as
>> indication of missed packets?
>> What if other reasons caused the loss, e.g. tail drop during
>> congestion caused by the MANET protocol itself?

> Packet Sequence numbers have the same "range" as a linklocal IP, so I don't
> see any problem with reliable transports. Such a transport would be built
> "below" packetbb, so the mechanism should be transparent to packetbb.

I don't see the relation to LL here. 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.

Ulrich