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虚拟专用网(Virtual Private Networks,简称VPN)似乎总是给世人带来实惠,但是它们有时候也给那些VPN的管理者带来麻烦,因为他们既要使本公司员工能够正常访问VPN,又要使它足够安全从而免受外部攻出。
Virtual Private Networks (VPNs) always seem to bring benefits to the world, but sometimes they also create problems for VPN administrators who need to have their employees access VPNs as well as Make it safe enough to protect against external attack.