Randy Bush <randy@psg.com> writes:
bogon block attacks % of attacks 0.0.0.0/7 65 0.01 2.0.0.0/8 3 0.00 5.0.0.0/8 3 0.00 10.0.0.0/8 8794 1.21 23.0.0.0/8 4 0.00 27.0.0.0/8 7 0.00 92.0.0.0/6 101 0.01 100.0.0.0/6 374 0.05 104.0.0.0/5 303 0.04 112.0.0.0/5 775 0.11 120.0.0.0/8 45 0.01 127.0.0.0/8 6 0.00 172.16.0.0/12 3646 0.50 174.0.0.0/7 1 0.00 176.0.0.0/5 1 0.00 192.168.0.0/16 7451 1.02 223.0.0.0/8 10 0.00 224.0.0.0/3 8 0.00
well, we can see why andree wanted to look behind the 1918 stuff. it is the elephant.
thanks, danny!
randy
In other words, our earlier estimate of 60% was way off... you can get 92.1% effectiveness at bogon filtering by just dropping 1918 addresses, a filter that you will never have to change. What's the operational cost trade-off with going after that remaining 7.9%? I'll betcha it's not justifiable. Maybe it's time to change the best current practices we recommend so that they stop biting us in the ass every time a chunk of our ever-dwindling pool of unused address space goes into play. My uncle used to tell this joke: Q: Why did the man hit himself in the head with a hammer? A: Because it felt so good when he stopped? -r