David Vielmetter

Month: October 2008

  • Restrict client DHCP requests using DHCP snoop

    What do you get when a multi-site network with several different domains was setup using a single class C IP subnet and an 8 bit mask? Broadcast storm mayhem! While ideally the solution for this organization would be to logically re-segment their network into smaller domain specific subnets such that inter-domain communications are not broadcast…

  • Allow or deny DHCP by MAC address

    I recently found this little gem on petri.co.il and subsequently discovered its origin at the DHCP technet blog. MAC Filter Callout DLL is a free dll file which allows a windows 2003 DHCP server to check a requesting client’s MAC address against a list of allowed or denied hosts before issuing an IP address.