Secure Tunneling Technology 安全隧道技术
HTTP Tunneling Technology HTTP隧道技术
VPN tunneling technology 虚拟专用网隧道技术
shield tunneling technology 盾构施工
The key technology of VPDN is tunneling technology, which usually refers to Layer2Tunneling Protocol (L2TP).
实现VPDN主要使用的是隧道技术，目前常用的是第二层隧道协议（L2TP）。
MVPN is built upon a new IP tunneling technology that USES multicast group addresses as tunnel destination addresses.
MVPN是以新的IP隧道技术为基础构建起来的，该技术将组播组地址用作隧道目的地址。
At present, shallow shield tunneling technology has been very mature, but very few specific study was conducted on deep tunnel shield tunneling technology.
目前浅埋盾构隧道技术己相当成熟，深埋隧洞盾构技术的专项研究很少。
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