Iptables Tutorial 1.2.2

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Conntrack helpers may either be statically compiled into the kernel, or as modules. If they are compiled as modules, you can load them with the following command

modprobe ip_conntrack_ftp

modprobe ip_conntrack_irc

modprobe ip_conntrack_tftp

modprobe ip_conntrack_amanda

Do note that connection tracking has nothing to do with NAT, and hence you may require more modules if you are NAT'ing connections as well. For example, if you were to want to NAT and track FTP connections, you would need the NAT module as well. All NAT helpers starts with ip_nat_ and follow that naming convention; so for example the FTP NAT helper would be named ip_nat_ftp and the IRC module would be named ip_nat_irc. The conntrack helpers follow the same naming convention, and hence the IRC conntrack helper would be named ip_conntrack_irc, while the FTP conntrack helper would be named ip_conntrack_ftp.


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