I have a strange problem interconnecting a Cisco851 with an ISP router.
The ISP router has the 192.168.1.1 255.255.255.0 address and the C851 has the 192.168.1.100 255.255.255.0 on the FastEthernet4 connected to the ISP device through a switch (but i've tried also the direct connection).
given this, no communication passes by between the c857 and the ISP device.
Sniffing the packets, i can see that the ISP Provider sends an ARP Request to know wich one is the 192.168.1.100 and the C857 filters it with the following reason:
The source mac address is that of the service provider router (which is actually open in that I can configure it but there are very few options.. for instance I can't set a static arp)
The Service Provider says everything's fine and it suggests to connect the machines directly to its Router (in this scenario, everything works properly and the computers have no problem answering that request).
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