该文档为铁道部发布的隧道监控量测技术规程，详细介绍了隧道监控量测的各项术语以及各项参数指标，是隧道监控量测领域的参考标准。-The document issued by the Ministry of Railways tunnel monitoring measurement technical regulations, details of the tunnel monitoring and measuring the parameters of the term indicator of

主要介绍IPSec技术。IPSec（IP Security）是IETF制定的为保证在Internet上传送数据的安全保密性能的三层隧道加密协议。-mainly introduce IPSec technology. IP Security Is a IETF development of the security of the security performance of the three layer tunnel protocol to ensure the security of the