iptables/cpu utilization

Linux Advanced Routing and Traffic Control

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What in the WORLD is using so much CPU.. we are getting a denial of
service attack about 100,000 packets per second and the router is 100%
cpu, then when I do iptables -t mangle -I PREROUTING ..etc.. -j DROP to
match the packets and drop them the CPU drops to like 15% ... so my
question is 
#1. What in the world uses all that cpu simple routing packets in one
interface and out the other?
#2. What in the world uses 15% cpu simply blocking packets in the
prerouting chain? I'm using NAPI and e1000 so i don't see how it could
even possibly use 15% 

Any ideas on how to debug or find out what's causing this?

Thanks

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