This is bash programmable completion for the conntrack-tools from netfilter.org. The package contains completions for conntrack, conntrackd, and nfct.
You can download it from the following link: https://packetstormsecurity.com/files/download/136719/conntrack-tools-bash_completion-1.0.tar.gz
Source: https://packetstormsecurity.com/files/136719/conntrack-tools-Bash-Completion-1.0.html