Configuring Citrix MetaFrame for Windows 2000 Terminal Services

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Remote Access Protocols


Remote access today just seems to get more and more complicated. There are hundreds of different modems, at least five flavors of the major operating system (Win95, Win98, NT 4.0, Windows 2000, and now Windows


Millennium, also known as WindowsME), and a multitude of different ways to connect to a remote network. With all of these choices, sorting out what your needs are can be a difficult task. Once you have identified the type(s) of service you would like to provide, you have to figure out how you’re going to do that. We’ve already discussed the hardware considerations and placement. Now you need to look at the various software choices you are going to have to make. The first and most important is the protocol type you will be using.

Dial-up Clients


Dial-up clients are remote users who access the network through a traditional RAS solution. Typically, this means they dial in directly to the local network through a RAS server. Dial-up clients are limited to the 56Kbps connection speeds we discussed before, and require no special hardware or software beyond the dialer and modem. There are two protocols that dialup supports, Point-to-Point Protocol (PPP) and Serial Line Internet Protocol (SLIP).

PPP and SLIP


PPP and SLIP are the two main dial-up protocols in use today. SLIP is the older of the two protocols. SLIP allows a remote user to make a serial link and transmit IP packets over it. SLIP was once very prevalent as a protocol, but has since been replaced in most networks with PPP because it cannot provide the same security levels that PPP can. SLIP is seen today mostly in older, unsecured network environments where user security is not a consideration.

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