Ignore DISCOVERs from a certain MAC?

[King, Michael]

Just in case Simon's and Glenn's ways don't work out (Which are a much
better ways to fix this)

FYI, I've cobbled this together from memory.  Please check for syntax /
logic errors, before trying this on production environment.  Also, the
FastEthernet is a deliberate syntax error.

On your cisco switch port, block all DHCP traffic...

access-list 140 remark Deny all Bootps traffic
access-list 140 deny udp any any eq bootps
access-list 140 remark permit all other traffic
access-list 140 permit ip any any


interface FastEthernet0/0    
ip access-group 140 in