How to block an IP range on w W2K server?

From: Louis schreyer (spam1_at_aquarix.de)
Date: 02/25/05 

Date: Fri, 25 Feb 2005 10:25:50 +0100

Hello,

just another question: On our W2K server is a mailserver installed, some
nice people from china try to break in to this mailserver since a lot of
weeks. (HLTT communications owns the network the access is coming from, a
well known spam hoster)

I would like to block all access from the IP range of HLTT to my webserver,
is that possible? I tried to make a rule to ipsec, but it still lets them
access the webserver. I made rules from the IP adress from HLTT to my IP
adress, any port with filter action BLOCK.

How can I block them ?

Louis