Hi all. I have a problem that I have not seen before that I need some input on. I have a company that has about 50 cisco switches, on multiple floors. They occasionally will call me and say that one floor in particular has goin down, meaning that in their view that their monitoring services lets them know that the switches cant be ping'ed. All of these switches on each floor go back to a core switch, which is vlan'ed off for each floor. When this happens, usually it only affects one floor, but it has affected more than one floor before (by the switches not being able to be reached, and about 5 to 7 switches on each floor). Usually, if Im not there, it will resolve itself in time. But what I do remember is that the very first time this happened, we found a laptop on the network with "internet connetion sharing" enabled and when we turned that off, the problem went away. However, I dont know for sure if the problem resolution was a coincedence or not. Has anyone seen anything like this before? And if so, can you give me some background as to what might be really going on (at least in your situation)? I appreciate any help.