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Posted by DLR on October 12, 2006, 4:07 pm
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port. Or a very sick one. And it spewing out something that's killing
your network. It may only be one. Try putting them back one at a time.
But stuff like this, if blown, are usually ready for the trash bin.
For the future you need to look at your office grounding. Let's talk
when you're awake.
Pradeep wrote:
> Hi DLR,
>
> Thank you for your help. It was a very long night for me.
>
> I finally located the problem to two CISCO VOIP phones. Once I plug
> them in, the system goes down after a few minutes.
>
> Is there any line conditioner that we can purchase? Don't want to throw
> the phones out.
>
> Thanks
> Pradeep
>
> DLR wrote:
>> Pradeep wrote:
>>> Hello Netters,
>>>
>>> I hope someone can help me. It has been a long day (and night) and I
>>> cannot think of anything else I can do to fix our network problem.
>>>
>>> In our small business setup, a DSL modem is connected to a Linksys
>>> router. The linksys router is connected to a 16-port Linksys switch.
>>> Some ports are used direcly by some computers. Other ports are
>>> connected to some other 5-port switches (through a patch panel).
>>>
>>> Although we don't have UPS anywhere, we have surge protectors for all
>>> of our electrical connections.
>>>
>>> It all started this afternoon. Looks like there was some kind of
>>> electrical surge. Some of our computers just rebooted themselves.
>>>
>>> After a couple of hours we started seeing this problem. Our 16-port
>>> switch just stops communicating. We cannot even ping machines on the
>>> neighboring ports.
>>>
>>> If I unplug the power cable on the switch and plug it back again,
>>> things work okay for a couple of minutes. After that, once again the
>>> switch stops communicating.
>>>
>>> Suspecting that the 16-port switch has a problem, we replaced the
>>> switch with a newly purchased 16-port switch. However, the problem
>>> seems to be still there.
>>>
>>> Can someone please suggest us what the problem could be?
>>>
>>> One theory I have is that some device that is connected to the switch
>>> (either the network card on the computers or one of the 5-port switches
>>> have started sending some wrong signals to the main switch, thereby
>>> messing it up. Is this possible? If so, is there a quick way to
>>> identify the culprit?
>> Start segregating your network. Unplug about 1/2 the ports on your
>> "central" switch. If things stay up with this start adding things. If
>> not remove 1/2 of this and try again. As long as things stay up for a
>> while, add a few more things and wait a while. Repeat.
>>
>> Or start buying managed switches so you can "see" who's acting up.
>
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