On Tue, Oct 22, 2002 at 10:55:26AM -0500, Scott Pilz typed:
> 
>       The answer to this is more than likely 'no'.
> 
>       But I'll try anyways.
> 
> Setup: NATD/IPFW
> 
> Say you have an IPFW rule to allow 10.0.0.2 through NATD - thus into the
> internet - and everything else to be blocked.
> 
> Your machine (10.0.0.2) that is being firewalled by NATD/IPFW works fine.
> Then someone else sets their machine up to 10.0.0.2, and now they can also
> get out into the network (there will of course be an ip conflict).

You can use arp(8) to make a permanent entry in the arp table on your 
NAT/Firewall box to prevent anyone else to use this IP address:

arp -S 10.0.0.2 Your_machines_MAC

> 
> My question is, for security, is there any way to use this type of block
> based on MAC ID. Almost to bond the MAC ID to the IP Address so the only
> computer that can use the IP address 10.0.0.2 is with MAC ID <whatever>?
> 
> 
> Thanks,
> 
> Scott
> 
> 
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