when I do a sh arp on my 2811 series Router I am getting mostly all the LAN IP addresses displaying identical MAC address and also that MAC address is showing conflict on with the Router fastethernet interface. The problem is that most of the PC in the LAN are unable to use Internet. All other services are working fine. Pls help to resolute.
The router's mac (without HSRP) will show up as many destinations, since it will answer for PCs that require proxy-arp. (proxy arp happens if the PC has an incorrectly configured mask, or for any reason sends out an arp request for something on its directly connected LAN, instead of sending the packet to its default gateway).
The router therefore can wind up representing many destinations if you're looking in the ARp table. But... no other address should share the router's macaddress if you're looking in any arp table.
Can you do a show arp from a PC or show mac-address-table from the router to show us what is being seen? also the IP address of the router in question would be helpful.
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