[Ns-bugs] [Bug 952] WifiMacQueue sender queue drops every 120 seconds of simulation, apparently for no particular reason

[code@nsnam.ece.gatech.edu]

http://www.nsnam.org/bugzilla/show_bug.cgi?id=952


Nicola Baldo <nbaldo at cttc.es> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID




--- Comment #3 from Nicola Baldo <nbaldo at cttc.es>  2010-08-04 05:54:34 EDT ---
Kirill, thank you for investigating the problem. I confirm it is an ARP issue,
in fact enabling logging for ArpCache we can see the following:

121.002s ArpCache:MarkWaitReply()
121.661s ArpCache:MarkAlive()

ARP packets might be lost, either due to a collision (as said by Kirill) or
more simply due to the overflow of the MAC queue. Still, I think the behavior
seen is explained by the fact that when the ARP cache entry is in the WaitReply
state, all packets from the upper layers are queued in the ARP queue, and will
be forwarded to the device only when the ARP cache entry is refreshed. In the
meanwhile, the MAC queue will gradually be emptied.

To summarize, this is not a bug.

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