( ) � � Spamhaus, �zombie� netblocks netblocks spammers. SBL . iptable .

. IP � � - �spammers �. IP spam spammers 100%. � � ARIN, , APNIC, LACNIC, spammers, � zombie� IP ( ) spammers netblock spammers.

ISP � �, , , dDoS netblocks.

iptables netblocks:
#! /bin/sh
- s http://www.spamhaus.org/drop/drop.lasso |grep ^ [1-9]| - 1 - �� | xargs - - 1 /sbin/iptables - - s - j

cron . . crontab :
0 0 * * * /etc/spamdrop

: /etc/spamdrop .

:
/sbin/iptables - nvL

:

0 0 0 - * * 206.197.176.0 /24 0.0.0.0 /0
0 0 0 - * * 206.197.177.0 /24 0.0.0.0 /0
0 0 0 - * * 206.197.28.0 /24 0.0.0.0 /0