At 09:08 PM 9/9/96 -0400, Avi Freedman wrote:
This is *exactly* the right thing to do; every provider which does not provide complicated transit (which excludes even certain regionals, alas) should do this at their borders if they don't do it at each customer connect.
And everyone should at least filter on each customer 56k/t1/etc... I know router cycles are tight but it might *really* become imperative...
Am I missing something.... If I am announcing a network via BGP I am more or less agreeing to carry traffic for it. If I am not I am not. Therefore, if I filter based on my outbound BGP announcements and do not allow any packets which have a source address not originating from a network in my BGP announcements then I should not be causing any harm to the networks which I am providing connectivity to. This has the added benefit of stopping people from defaulting into me at exchange points as I will not carry that traffic across my backbone. I'd love to hear the holes in this theory. Justin Newton Internet Architect Erol's Internet Services