I have a 7206 Router with 2 Fast Ethernet Interface. From my ISP's modem a cat5e is connected to FA1/0 (WAN) and my switch is connected to FA2/0(LAN). My question is, the increasing CRC errors and Input Errors in WAN Interface (FA1/0) I know that CRC errors is on the physical layer. I tried replacing the cables and FA interface module but still no avail. I already escalate the problem with my ISP but the weird thing is they did not found any CRC errors on their side. I think the DTE modem on our side is the cause of the problem. Any suggestions?