I have to agree with Jason though...why not implement port-security on the specified port which in this case f0/1.
switchport mode access
switchport port-security maximum 4
The default action is to shutdown the interface. You can change this if you type "switchport port-security violation (option)" Options being "protect", "restrict" or "shutdown". Restrict is a nice option if you do not want to shut the interface down but still block unknown addresses. I think this is what you were looking for.
What this will do is learn up to 4 (in my example) then shut the interface down if anything is outside of that list (unless you change the option). For this to effectively work, you would have to configure this on your switchport then plug in each machine (or device) to have the switch learn the MAC addresses.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...