I noticed on our network monitoring server that it's detecting an Ethernet0/0 interface on various routers on our network. The problem is these routers don't have an ethernet interface, they only have fast ethernet. I have seen it so far on a 1760 and a 1721, running different IOS. To eliminate the monitoring software, I used a MIB browser to walk the interfaces on the router, and sure enough, it comes up with this ethernet 0/0. But if I look at the config on the router, there is no ethernet interface. Also, the monitoring station also shows the interface in an up, up status. How can this be? Is there a known issue with this happening that I have not heard about?