strongswan from home:Pharaoh_Atem:CS9EPELDev project
Select Your Operating System
Add repository and install manually
For CentOS 9 run the following as root:
cd /etc/yum.repos.d/ wget https://download.opensuse.org/repositories/home:Pharaoh_Atem:CS9EPELDev/CentOS_9/home:Pharaoh_Atem:CS9EPELDev.repo yum install strongswan