conntrack-tools from systemsmanagement:Ardana:8:CentOS:7.3 project
Select Your Operating System
Add repository and install manually
For CentOS 7.3 run the following as root:
cd /etc/yum.repos.d/ wget https://download.opensuse.org/repositories/systemsmanagement:Ardana:8:CentOS:7.3/CentOS_7.3/systemsmanagement:Ardana:8:CentOS:7.3.repo yum install conntrack-tools