根据中办、国家保密局等单位对信息系统安全的要求 ,将中国水利信息网 (NFCnet)进行了重新设计和相应调整 ,严格划分出计算机涉密网 (NFCnet S)和计算机普通网 (NFCnet C)。信息也分为涉密信息和非涉密信息。建立加密的安全隧道和 VPN技术介绍 According to the information security requirements of the Office of the State Council and the State Secrets Bureau, the China National Water Information Network (NFCnet) was redesigned and adjusted accordingly. A strict classification of the NFCnet S and the NFCnet C ). Information is also divided into confidential information and non-confidential information. Establish an encrypted security tunnel and VPN technology introduction