Hi!

On 05:00 Tue 27 Nov     , Joerg Pommnitz wrote:

quoted

So, are you still sure you've tested such a case?

Well, the problem that triggered my investigation was
that the OLSR daemon (www.olsr.org) calculates the quality
of a link according to the packet loss for LQ HELLO packets
(UDP broadcast packets). To prevent other traffic from
interfering with the LQ calculation, olsrd sends the HELLO
packets with a TOS value of 0x10 (minimize delay). This
should give them the highest priority.

What I saw was a degrading Link quality with more user traffic
over a link. The LQ fell so far that olsrd judged the other host
unreachable and deleted the routing entry. The user traffic in
question was iperf (TOS value 0x00).
--  
Regards and thanks for taking an interest

 
       Joerg

There is another possible cause of this problem.

In WLANs all packets are acked or retransmitted. This is done to
prevent packet loss due to noise and collisions. But this is not
done with broadcast packets.

I can't tell you if this can be enough to trigger the bevaviour
you experienced. Is the signal barely receivable?

Michi
-- 
programing a layer 3+4 network protocol for mesh networks
see http://michaelblizek.homelinux.net