It sounds as though the MSFC is set for proxy-ARP. Your client ARPs for the default gateway, and the MSFC sends its MAC address as a response. The interface command "no ip proxy-arp" should stop this behavior if I am correct about the cause.
Was proxy-ARP enabled? I don't see how your results could occur otherwise.
Again, a sniffer will tell the story here. What does a given host do when you give it a gateway that is outside it's subnet? Some UNIX variants won't accept such a command in the first place. But on a host that does let you do this, does it ARP for the gateway when sending a non-local packet or does it just ARP for the destination? Either way, something has to respond to the ARP request and I don't see why the 6500 would do so unless proxy-ARP is enabled.
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