但是人们的注意力只集中在外部攻击的防范，内部网络安全却被忽视了。
However, people's attention is only focused on preventing external attacks, internal security is neglected.
针对网络安全的隐患，提出了内部网络安全体系结构，并对其中的关键技术作了探讨。
In this paper, architecture of inner-network security is presented, and then some key technologies of inner-network security is discussed.
结合实际工作中出现的问题，在保证内部网络安全和满足医院医疗服务的前提下，作者提出了利用A CL与NAT技术，实现医院内部信息网与外部医保网络对接的解决方案，并给出了具体的实现方法。
With the appearance of the problem from practical work, the authors put forward a solution and detailed methods to connect the hospital internal LAN to external medical insure net using ACL and NAT.
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