Network security is an important factor in the organization which relies on information technology. This reason makes network security mechanism must be implemented with good consideration and efficiency, to make sure there are not data that can be stolen by the attacker. IPSec is security protocol in layer three of the OSI model. The purpose of IPSec is to encrypt each data packet either in or out in the network. This study aims for providing design analysis and implementation of IPSec as a security protocol for PT. XYZ’s client network. The result of this research is IPSec’s configuration who author suggests based on attached journal is properly implemented, and can be referenced for next implementation.