Hello All, While I have used iptables for a while, I have found that I needed to gain more knowledge to push what I am doing with it to another level. I have read through a few things on-line and in the readme stuff, but have some confusion that I want to clear up. I am thinking that a chain is a group of rules, and I can create multiple chains to define rules for different things. Lets say FTP-RULES, SPAM-RULES etc. If I do this I can hopefully flush just one group or chain without effecting the other rules is what I am thinking. When I execute a rule I do this: iptables -A INPUT -p tcp -s 118.242.0.0/16 -j LOG --log-prefix SPAM-BLOCK- CIDR-ASIAN iptables -A INPUT -p tcp -s 118.242.0.0/16 --dport 25 -j DROP I wanted to change it to add it to a chain like so: iptables CIDR-ASIAN -A INPUT -p tcp -s 118.242.0.0/16 -j LOG --log-prefix SPAM-BLOCK-CIDR-ASIAN iptables CIDR-ASIAN -A INPUT -p tcp -s 118.242.0.0/16 --dport 25 -j DROP iptables -N CIDR-ASIAN -A INPUT -p tcp -s 118.242.0.0/16 -j LOG --log-prefix SPAM-BLOCK-CIDR-ASIAN iptables -N CIDR-ASIAN -A INPUT -p tcp -s 118.242.0.0/16 --dport 25 -j DROP This didn't work for me and I have tried several varients with no luck. So my first question is do I understand correcty how to utilize chains? Will I be able to load and unload chains rather than flush everything end reload everything? ( I have a lot of rules ) Sample syntax would be great because I have found a million sites without seeing what I really want. Finally when I go to save these chains like the docs say iptables-save -t fail2ban-VSFTPD I get the following error: iptables-save v1.2.11: Can't initialize: Table does not exist (do you need to insmod?) This happens on different versions of Centos & on a RH as well. Thanks! ( sorry for the long description ). -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
