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VPN (:radioactive_sign:隧道协议 (:one:PPTP (:explode:点对点隧道协议., :bread…

- - - - :one:可以在不止IP网络内使用
      - :two:2端点间可以使用多隧道
    - - :bread:L2TP本身不能提供加密和保密
  - - - :link:OpenVPN
- - - - :one:个人拨号选择OpenVPN
      - :two:如果不想安装客户端,用PPTP(不建议)
      - :three:多个机房互联用IPsec VPN(Openswan)或Open VPN