At 12:29 PM 12/1/98 -0700, Pete Kruckenberg wrote:
On Tue, 1 Dec 1998, Alex P. Rudnev wrote:
UUnet uses ascend TNT's which they claim you cant filter directed-broadcast on. Ive ranted at them since October 20 to get this serious security hole closed. If they can't turn this off on ascend access server, they anyway can filter out broadcast addresses in their border routers (CISCO's) forwarding traffic to this access servers. The result is (almost) the same.
Filtering broadcast addresses is pretty ugly. Consider that a single Class C broken down into /30's can have 64 broadcast addresses. Maybe if it was just filtering your own assigned subnets, it would be possible, but this also applies to customer-subnetted broadcast addresses, so you'd have to coordinate your filter with every one of your customers, every time they change subnets. Not impossible, but pretty close.
IFF they *only* sub-net into /30's and not have irreguilar sub-nets below that. The best I can think of is to just cover your own subnets and let your down-stream worry about theirs. Otherwise, it's no do-able, like you said. ___________________________________________________ Roeland M.J. Meyer, ISOC (InterNIC RM993) e-mail: <mailto:rmeyer@mhsc.com>rmeyer@mhsc.com Internet phone: hawk.mhsc.com Personal web pages: staff<http://www.mhsc.com/~rmeyer>.mhsc.com/~rmeyer Company web-site: <http://www.mhsc.com/>www.mhsc.com ___________________________________________________ Who is John Galt? "Atlas Shrugged" - Ayn Rand