I just setup my Cisco router 1921/K9 router via lease line. I managed to reach both end using ping command via local network. After an hour, my local LAN with different subnet starting to act weird, IP conflict error message pop up on the screen. It gradually spread over the network, PC by PC.
By issuing #sh int s0/0/0 and #sh int giga0/0 , I can see an input error, and CRC error. "Reliability" was perfect 255/255. Duplex and Speed all set to 100Mbps full duplex.
I have been looking into this matter for a few days, but still no idea what is actually going on. When I unplug LAN cable from giga interface to my local LAN cisco switch, IP conflict has disappeared.
Has anyone encounter this issue before? Kindly assist.
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