Re: [Karlnet] RE: Ping Jitter

[Ryan Walker <rwalker@oacys.com>]

At 01:24 PM 9/12/2003, you wrote:
> > The problem that I am seeing is not only dropped
> > pings on links with perfect
> > SNR (25?) but complete outages for the CPE for a few
> > minutes, sometimes.
>
> Yes, I'm seeing this too but only on a few clients. At
> least only a few clients have reported the problem.
> The outages are always brief and the signal strengths
> are good. I assume this is the same problem - can you
> confirm Kevin? If so, you can save me (and others)
> some time troubleshooting the issue and I will just
> wait for the next update.
>
> Cheers,
>
> Paul

Paul - I believe that I had the same problem here.  We would have clients 
call us saying that their connection was down, we looked in the station 
list on the base and they were listed, yet we were unable to ping their 
radio or computer.  In tracking this down I found that our network was 
occasionally being flooded by incoming pings that were generating a large 
number of broadcast ARP packets from the router (this was DoS traffic from 
the blaster.d worm coming in over the Internet).  I realized that most all 
of our radios (base and client) had the storm threshold settings filled in 
- we never really thought it would block traffic unless there was a major 
problem since the threshold was 60pkts/sec.  I used a firewall rate limiter 
to block those DoS packets and our problem was solved.  The problem started 
about a month ago  (about the time blaster.d was in the wild).  You might 
want to look into this, we decided to only leave the threshold setting for 
the client Ethernet side.  Good luck!

-Ryan