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Loosing network connection

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by kashmeir63

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Hi,
I hope explain this correctly.
I have a building(bldg B) which is in a different location from the main building(bldg A). Bldg B is connected using a fiber optic(which is using a fiber to rj45 connection)to connect in bldg B to bldg A. In bldg B there are a few hubs and switches. With no change to the network, users in bldg b have been dropping loosing their connection to the network. There have been no power interrupts everything appears to be fine. There is a ups hooked up to the hubsand switches. If I power all the hubs, switches off and back on, the users are fine for that day.Until the next day and I have to do the same thing again.Is there there any reason that would cause me to have to power cycle off and on again. Any helpwould be appreciated.

5 replies

by sgt_shultz

here are some questions that occur to me:
they are losing the LAN, not just internet, right?
when the bldg b users get dropped, are *all* of them or *several* of them dropped simultaneously? if *they* reboot, do they get back on? or do you recoverthem by rebooting the hubs/switches...
when they get dropped, can you ping *anything* from them? like fiber router? like anything in bldg a? like internet?
if everything used to work fine and truly nothing has been disturbed or changed and you fixthe problem with resets, it sure does sound like something wacky with hub or switch. or wiring to same. if subgroup of bldg B goes down, look for hub they all plug into. tell us more about the network topology. if the whole building is going down, instead of resetting everything, try just resetting devices one at a time starting with the 'top' device (fiber optic transceiver thingy?).
if you can narrow down to one device, put blankets on it, shine light bulbs next to it, deprive it of ventilation etc see if problem can be reproduced that way. if not, look for wiring...
my 2 cents, hope it helps. this one will be an easy fix i think, hang in...

by d.walker5

Try reducing the lease time on your DCHP server. The default is 7 days, reduce it to 2 days. I petty sure this will resolve you problem.

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