Recently, Many projects have been implementing IPsec(IP Security) on the various Operating Systems for security of IPv6 network. But there is no existing tool that checks the IPsec-based systems, which provide IPsec services, work properly and provide their network security services well in the IPv6 network. In this paper, we propose a rule-based approach to security test automation on IPv6 network. So, we design STRDL(Security Test Rule Description Language) to define security test rule and rule execution engine for executing the rules defined by STRDL for testing security of the IPv6 network, and we provide implementation details. The system is divided into following part: User Interface part, Rule Execution Module Part, DBMS part and Agent that gathering information needed for security test.