On Thu, 2 May 2002, Christopher L. Morrow wrote:
Congrats on re-inventing the wheel :( This is what mazuu/arbor/wanwall(riverhead now?) all do... this is also the way CenterTrack(tm robert stone) was kind of supposed to work.
Thanks for the kind works. Just to be clear: I'm not working on a _product_, just on a paper explaining how to do this using standard components and protocols.
As near as I can tell this doesn't scale too well in a large network.
If you have a router that can forward 10 Gbps into the right direction, you can also have a router forward 10 Gbps in the wrong direction. That's pretty much all it takes.
This is a shame, but its a reality. Additionally 20k sources max? that's not nearly enough, how many addresses are in 0/0 ? you should atleast plan for this contingency...
The idea is to use unicast RPF. So you're only limited by the number of routes a Cisco can hold. 20k per customer under attack should be doable without too much effort, more should be possible, but filtering 0/0 defeats the purpose. Also, it can be done using a single line, so no problem there.