On Jul 30 21:16, Edward Henigin wrote: } Subject: disabling forwarding of directed broadcasts % this does work as you'd expect (it prevents the cisco % from framing an IP broadcast packet into an ethernet broadcast % frame) BUT unfortunately it can break Windows networking, as well % as BOOTP/DHCP, depending on how you're set up. BOOTP/DHCP does NOT need directed broadcast forwarding enabled to work properly. The "helper-address" function and the DHCP RELAY code take care of BOOTP/DHCP traffic. Implementations of BOOTP/DHCP don't require enabling forwarding of directed broadcast packets. I've verified this experimentally in a previous life. I also have (past) experience with a network running MS/NetBIOS cruft through routers with forwarding of directed broadcasts DISABLED. It worked fine. If there is some corner case I've missed that requires forwarding of directed broadcast packets, it would be useful for that specific case to be enumerated _in detail, in public_. Ran rja@home.net