how to block 10000's of addresses?

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I would like to know how best to block 10000's of addresses using
netfilter.  Clearly I do not want to be placing 10000's of individual
filter table entries in.  Is there some kind of means to set up the
equivalent of a routing table like lookup structure (which can be
added to and removed from separately) which a single netfilter rule
would reference to apply matches?

I want to block _incoming_ packets.  Null routing these addresses is
not sufficient, as the lame SYNs will continue to eat up resources.

-- 
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| Phil Howard - KA9WGN |   Dallas   | http://linuxhomepage.com/ |
| phil-nospam@ipal.net | Texas, USA | http://ka9wgn.ham.org/    |
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