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Prerequisites :

Netfilter :

• CONNMARK
• nth (or statistic module)
• condition (for failover)
• Iproute2

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Introduction

CONNMARK is a cool feature of Netfilter. It provides a way to have a mark which is linked to the a connection tracking entry. Once a connmark is set, it also apply for RELATED connection entry. So, if you add a connmark to an FTP connection, the same connmark will be put of connections from ftp-data.

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