Device causing Router Conflicts

Hello Experts :

Our router went down in our small business... and I came to the conclusion that it was caused by a device in our other building. I came to this conclusion because two different routers crashed as soon as I insert our fiber link to our other building into our switch.

So what I did was unplug everything at the other buildings switch... and slowly plugged everything back in until I hit an Ethernet wire that would cause the crash... This never occurred.

This morning when I came in everyone's internet was working in the main building but at the other building causing this issue... everything was down.. I unplugged and replugged everything from the switch and everything worked fine. Currently everything is working fine, I just feel its a matter of time before everything crashes again.Ive had an issue like this once and it was caused by someone resetting a wireless access point being reset to the same IP address as our router causing a conflict but this is not the case. Can anyone think what else could be causing this?

We have :

Motorola Surfboard 885100 Modem
Zyxel Zywall USB 100 Router
ZyXEL Switch PoE ES-2024
Netgear Prosafe 24 Port Gigabit Switch

Other Building causing the issue also has a ZyXEL Swith PoE ES-2024

These two switches have a fiber connection between the two... I figure it has something to do with these two switches. Any Ideas?

Thanks in Advance!

Matt
meshoxfordAsked:
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toc-tomConnect With a Mentor Commented:
Download Nmap http://nmap.org/ and scan all the devices on your network.  This will give you a list of the addresses so you can find the conflicts.
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meshoxfordAuthor Commented:
Trend Micro has marked that page as dangerous, are you sure its cool... Is this similar to WSPing?
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toc-tomCommented:
I've never had a problem downloading from that page.  Here's a wiki article on Nmap if you want more info.  http://en.wikipedia.org/wiki/Nmap
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