Strange network issue

[ozmusafir]

Hello,

 

Our school is having a new build therefore a temporary class is setup and provided with networking. I have connected the temporary class to the access the internet/network resources by stretching a cat5 cable from the main building. One end of the network cable is directly connected to a port on the wall and the other end is connected to a switch at the temporary build point. Today all the members of staff had issues with accessing the internet, however could access network resources. Anyways I finally got around the problem by unplugging the cat5 to the temporary build and everybody can access the internet. I plugged the cable back into the port and bam we had no internet access.

 

Anybody can point me into the right direction so that i can pinpoint the issue, because I have no idea whats causing the issue?

[LeMarchand]

Have you got a different switch you could try in the class? Could be a simple as a duff (or incorrectly configured) switch. Edited February 23, 2015 by LeMarchand
Typo

[ozmusafir]

Hi,

 

I don't have a spare switch but what I'll do is connect the cable directly to the computer rather than the switch. The switch has a wireless AP connected to it so that the teacher can surf the internet wirelessly on her laptop and use the internet on the desktop. i'll report back.

 

- - - Updated - - -

 

Connected the one end of the cable directly to the pc and now everything is working smoothly.

[LeMarchand]

Might be worth playing around with various combinations if you're in when it's quieter (switch only, AP only - assuming the latter has a few "wired" ports) to work out which bit of kit is causing the problem. One of my schools uses some (soon to be replaced) "domestic" APs for wireless, and it causes intermittent problems.

[Sephiroth]

Without seeing it, sounds like the switch is configured as a router or gateway. Is it a managed switch? Assuming that you still need the switch there, try resetting to factory defaults (if possible), and see what happens.

[DavetheITguy]

Has the switch been VLANd off, it might be worth doing a factory reset on the switch.

[cpjitservices]

Plugging a Cat 5 into the wall - How do you mean ? Into a wall socket module ? Where does that terminate ?