On May 4, 2007, at 1:20 AM, Ryan Langseth wrote:
Over the last few months we have been fighting an intermittent
problem on one of our towers. At seemingly random times, we will
experience packet loss to customer equipment and/or large amounts
of duplicate packets, anywhere from one dupe per 10 pings to 10+
dupes per ping.
The tower has 3 sectors on it, and one horizontal omni. the
sectors are on 1, 6, 11 and the horizontal is on 1. We are
approximately
180 feet up the tower. The wireless cards are 200mW prism cards. I
also know there is a FM radio station broadcasting off the tower,
at 107.1, not sure about the .1. And Nortel Network has equipment
on the tower also. The cat5 cable running up the tower is
unshielded I believe. It was put up before I started with the company.
The Access points are bridges plugged into a switch and then into
a router.
Normally this problem occurs during higher usage periods, an almost
always stops at around 5pm, which made me assume we were
overloading the AP(s), tonight though, I was seeing massive
duplicates to one customer, and some duplicate packets to a bunch
of other customers. The network load at the tower was minimal,
right around 2mb/s.
EDIT: This should have been packet duplicates, not packet loss.
To test the sectors, I deauthorized all of the customers except the
one with massive packet loss and turned off all sectors except
theirs. I still saw alot of packet loss.
That should have said "I still saw alot of packet duplicates" I was a
little tired when I sent this.
Can poor tower grounding cause this? Is it something to do with
the FM or Nortel equipment? I really don't think it is the routing
equipment, since we have other towers that run fine and can push
more through without an issue.
Any suggestions or questions would be greatly appreciated.
Ryan
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