This talks about "Reputation Filtering" of IP addresses http://isc.sans.org/diary.html?storyid=8287 -- Robert Ladyman File-Away Limited, 32 Church Street, Newtyle Perthshire, PH12 8TZ SCOTLAND Registered in Scotland, Company Number SC222086 Tel: +44 (0) 1828 898 158 Mobile: +44 (0) 7732 771 649 http://www.file-away.co.uk