DDoS mitigation with BGP communities
Matthew Crocker
matthew at crocker.com
Tue Jun 15 03:28:24 UTC 2004
Hello,
I just experienced my first official DDoS attack against my network.
I never realized how helpless I was :(. I had roughly 70 mbps of
traffic aimed at one IP. The IP wasn't even in use, I'm assuming
someone typed the wrong IP and meant to send it somewhere else. I shut
it down by removing the /24 announcement. This was fine except for
the customers on that /24. I know my upstreams have special
communities I can set via BGP announcements that effectively say 'route
packets to this network to null0'. My question is, what do I need to
put on my router (i.e. code examples) to inject the /32 into the BGP
announcements. I try to be a good net citizen and announce aggregate
blocks. I had to break my /21 up so I could announce everything but
the /24 in the middle. Any help would be greatly appreciated.
Routers are a couple 7500 series running 12.0.xx
-Matt
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