不需要对广域网的交换或路由结构作修改。
No modification to the WAN's switching or routing fabric is required.
此外，如果您的客户在广域网或因特网上的分布比较分散，这将是一个较好的解决方案。
Furthermore, if your many clients are spread widely across a WAN or the Internet, it's an even better solution.
您可以设置该位于内部(LAN)一方或外部(广域网)方根据其IP地址或端口号的网络不同用户的不同数据包筛选器。
You can set up different packet filters for different users that are located on internal (LAN) side or external (WAN) side based on their IP addresses or their network Port number.
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