I am replacing a cisco 1751 router with the new 1841 router.
The WAN side is UP/UP. The fastethrenet side is UP/DOWN. The speed is auto and duplex full. It is configured the same as it was in Cisco 1751.
The Fas 0/0 connects to 3COM switch. The LED on 3com switch is off when 1841 is connected.But on 1841 the LED for fas 0/0 is green.
Any ideas what is happening here?