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

["Dearlove, Christopher (UK)" <Chris.Dearlove at baesystems.com>]

> What if someone defines a reliable transport and suppress 
> repeating messages?

There are many ways in which this is not relevant
- NHDP messages are local broadcast. If you have a reliable
  local broadcast mechanism to unknown recipients, I think
  we'd like to know.
- The transport mechanism sees packets, not messages. These
  are much less likely to be repeats. but even messages may
  not be repeated, due to e.g. message sequence numbers and
  security mechanisms.
- It's no business of the transport mechanism to do this.
  There are reasons to repeat messages due to mobility, trying
  to find unknown nodes etc.

> Are we sure we want to use missing sequence numbers as 
> indication of missed packets?

It's an option. Nothing in that area is something that must
be done. It's not my first choice of options, I think there
are better ones. But that doesn't make it unusable.

> What if other reasons caused the loss, e.g. tail drop during 
> congestion caused by the MANET protocol itself?

If your congestion gets to the point where sufficient dropping
is occurring to make this happen, then there is a real problem in
any case, especially if (as one should) give routing signalling
a better than average priority.

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