[Ns-bugs] [Bug 253] ARP does not retry upon loss

[bugzilla-daemon@nsnam-www.ece.gatech.edu]

http://www.nsnam.org/bugzilla/show_bug.cgi?id=253





------- Comment #8 from mathieu.lacage at sophia.inria.fr  2008-07-21 13:29 -------
(In reply to comment #7)
> > > 3) use a per-cache timer 
> [ ... ]
> 
> > > I really prefer 3 above.
> 
> > I would be fine with this, thanks.
> 
> When I initially thought about the problem I came to the conclusion that a
> per-cache timer would be best; but when I looked at Linux I found per-entry
> timers.

ok. that's a good data point.

> I believe the primary reason you would swallow this overhead is to avoid a
> "thundering herd" of retries which you could get if you scanned the entire
> cache on a single timer expiration; especially if we were to someday start
> aging the entries in the cache.

It should not be too hard to just fire an update for the first one and defer
the next update to some later time.


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