At present the network services have become more diversified. As the quatity of service is not a problem，we should be more concerned about the quality of service. If there is something wrong with the network service，rapid repair mechanism in an enterprise network management is very important. How to build enterprise firewall with high reliability using low cost is designed and implemented in this research. The design can not only support IPv6，but also can reach the dual backup mechanism with efficient transmission to ensure the security of corporate information.