mac address

[Malik Bülent]

hello 

i use freebsd5.1 and i want to reject some computers  whose according to "Mac Addresses" 
and i recompiled kernel with 
options         IPFIREWALL 

then i made ipfw.sh with touch and wrote in ;
ipfw add deny MAC 00:60:67:28:0c:1e any     
                                            
ipfw add deny MAC any 00:60:67:28:0c:1e

but I couldn't reject above machine

What shall i do ?

Thanks