Just wanted to report some problems with the visitor wireless network
in the Counting House A, which is building 60.
So far the problem has been observed on 2 systems, mine, which is
running windows, and an Apple laptop. The problem is that sometimes
the connection gets extremely slow (SLAC homepage takes ~5 mins to download).
Interestingly, the problem was not observed on both systems at the
same time, but one had a good connection while another one could not
transfer data. Signal strength stays high and wireless reports at
least 12 MBit/s connection speed.
That looks like switching problems to me, though i am no expert.
Trying to ping to different sites on my machine gives:
www.slac.stanford.edu - 2 ms
www.google.com - 54 ms
www.ucl.ac.uk - timed out
We then heard from the user that it was taking hime 10 minutes to download the SLAC home page. Typically this shoud take a few seconds, so something was dramatically wrong.
We requested more information from the user: what O/S, when did it occur, what is the host name and address (we needed this among other things to see whether the switch he was attached to was working properly). We suggested trying the NDT server at Stanford (http://netspeed.stanford.edu/) since the visitor subnet cannot access the SLAC NDT server at http://nettest5.slac.stanford.edu/ due to security concerns WE also suggested that when gthe problem occurs to alos run pings from his host to the server with which he is having slow response.
The user reported that on Sunday July 1st 2007 around 14:30 he again had extremely slow connections on two systems in building 60 (End Station A). The systems were:
To avoid becoming a supernode, and having your network impacted, you may find the following suggestions from FNAL helpful (as always, your mileage will vary, and FNAL is responsible for the information). https://netweb.fnal.gov/skype/skype.htm.