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对于大多数使用IBM主机的公司来说,问题已不再是是否允许通过TCP/IP进行系统访问,而是何时及怎样访问。但是IP堆栈是直接在IBM MVS操作系统上运行,还是使用一个外部网关在已建立的SNA网络和基于IP的内部网之间进行翻译?仅在数年前,大多数公司将选择网关。但是,由于IBM公司极大地改进了MVS IP服务并将它们免费捆绑于操作系统内,情况发生了变化。网关仍然具有一席之地,但是大多数MVS主机目前已能够运行本地IP服务,且不会对性能产生较大影响,并可提供最新的IP技术。据IBM公司称,至少30％的主机客户已加载了IP。随着越来越多的客户升级到更新的MVS版本,这一数字将在未来两年内增长到90％。运行IP的需要并不意味着IBM主机赖以运行多年的SNA网络已经完结。事实上,由于建立安全交易和服务质量保证的需要,对银行交易和其它服务来说SNA变得日益重要,SNA一直在增长。
For most companies using IBM mainframes, the issue is no longer whether to allow system access over TCP / IP, but when and how to access it. But does the IP stack run directly on the IBM MVS operating system or use an external gateway to translate between established SNA and IP-based intranets? Only a few years ago, most companies would choose gateways. However, the situation has changed as IBM has greatly improved MVS IP services and bundled them freely in the operating system. Gateways still have a place, but most MVS hosts are now able to run native IP services without any performance impact and provide the latest in IP technology. According to IBM, at least 30% of host customers have IP loaded. As more and more customers upgrade to newer MVS releases, that number will grow to 90% over the next two years. The need to run IP does not mean that the SNA network on which the IBM host has been operating for many years has come to an end. In fact, due to the need to establish secure transactions and service quality assurance, SNA has become increasingly important for banking transactions and other services, and SNA has been growing.