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  Asked: Mar 20 2008   6:44 PM GMT
  Asked by: JoNetGuy

Cabling Anomoly


Cabling, Networking

Consider the following scenario: Each office has two Cat5e ports (A & B)and there is an 'A' Patch panel and a 'B' patch panel. When PersonA is plugged into port 1A and PersonB is plugged into port 28A they can see each others computer screen. If PersonA is online working and PersonB comes in to log on -- when it gets to her login security screen, it pops up on PersonA's computer screen and PersonA can see what PersonB is doing and vice versa. I had PersonB plug into port 28B and the problem stopped.

Can you explain this phenominum? It this is crosstalk issue or how could this happen with the installation of new Cat5e wiring?

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Last Answered: Mar 20 2008  7:41 PM GMT  by Labnuke99




This sounds like maybe one port is spanned to the other. This also sounds totally bizarre. The only time I have seen something like this is when using a remote access trojan type of application or remote desktop or VNC. Otherwise this type of activity would be like like a man-in-the-middle type of attack. This would take place due to ARP manipulation and not typically a cabling issue unless the switch MAC address table is flakey.
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Snapper70  |   Mar 21 2008  5:40PM GMT

We’re missing what is being plugged in (device) and what’s in the back end. A Windows workstation would just fail miserably, and not get the signin credentials from another session altogether. This wouldn’t happen to be a coax/twinax type application with baluns? THAT could explain the behavior you’re seeing…

 

JoNetGuy  |   Mar 25 2008  1:23PM GMT

Two Windows XP notebooks were plugged into the those ports and then plugged into an HP 4000N switch. Only Cat5e wiring involved in this scenario. I am almost sure that it is a wiring issue of some sort, but I am not on site to check.