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...96 --- Comment #3 from Alessandro Vesely <vesely at tana.it> 2013-06-21 15:50:56 CEST --- (In reply to comment #2) > you have to put this REJECT rule before any RELATED/ESTABLISHED > conntrack ctstate match rules (which is suboptimal). No, I can use conntrack -D to have the connection unESTABLISHED. In general, it is polite to send a tcp-reset to both peers. However, people often reset connections because the remote peer is a malicious client, so it is popular to omit sending the tcp-reset as a form of revenge. Still, people like to reset their own side, so as to avoid wasting resources....

After reading this article: http://www.theregister.co.uk/2005/08/31/blocking_chinese_ip_addresses/ I got to thinking that there is really no reason for *any* traffic to hit my servers that comes from anywhere outside North America. So I wrote the perl script at the end of this posting to extract selected IP ranges posted at iana.org and convert them into iptables rules blocking any traffic