Limits to size of 2.4/2.6 iptables?

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I need to block a DDoS for a client, and although I'm able to detect the
attacking IPs, and drop them in a table to block, the table is getting
large quickly. Is there a better way to apply rules to 10-20k IP
addresses? Clearly we don't want to block legitimate users.

What I'm doing is working, I just wonder if it will scale, and if I'm
missing some better solution.
-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.
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