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A proxy server sits in between clients and external servers, essentially pocketing the requests from the clients for server resources and making those requests itself The client computers never touch the outside servers and thus stay protected from any unwanted activity A proxy server usually does something to those requests as well Let s see how proxy servers work using HTTP one of the oldest uses of proxy servers Since proxy serving works by redirecting client requests to a proxy server, you first must tell the Web client not to use the usual DNS resolution to determine the Web server and instead to use a proxy Every Web client comes with a program that enables you to set the IP address of the proxy server, as shown in the example in Figure 12-30 Once the proxy server is configured, HTTP requests move from the client directly to the proxy server Built into every HTTP request is the URL of the target Web server, so the Web proxy knows where to get the requested data once it gets the request In the simplest format, the proxy server simply forwards the requests using its own IP address and then forwards the returning packets to the client (Figure 12-31) This simple version of proxy prevents the Web server from knowing where the client is located This is a pretty handy trick for those who wish to keep people from knowing

DirectManage is aimed squarely at enterprise networks and is priced at $19 per managed account This means a 5000-user network would require a $95,000 license fee (however, Entevo has said it will give a discount for volume sales) The only competition DirectManage has today is a few tools that overlap Direct- Manage in functionality (RoboMon and Enterprise Administrator, for example) and the administration tools within Windows 2000 If you can't wait for Windows 2000 to get cracking on Active Directory, or you want to ease the migration to Windows 2000, give DirectManage a look Otherwise, it might be prudent to see if the built-in tools in Windows 2000 are adequate to do the job

where they are coming from, assuming you can find a public proxy server that accepts your HTTP requests (There are plenty!) There are many other good reasons to use a proxy server One big benefit is caching A proxy server keeps a copy of the served resource, giving clients a much faster response A proxy server might inspect the contents of the resource, looking for inappropriate content, viruses/malware, or just about anything else the creators of the proxy might desire it to identify

The contour used comes in from the negative real axis, goes counterclockwise about the origin and out along the negative real axis, avoiding the branch point at the origin The Stirling approximation for the gamma function is given by ( z + 1) 2 e z z z +1/ 2 (1115)

Certainly one of the most advanced sets of tools available today to help migrate to Windows 2000 is FastLane's Domain Management Suite (DM/Suite) The suite includes three separate

HTTP proxy servers are the most common type of proxy server, but any TCP application can take advantage of proxy servers Numerous proxy serving programs are available, such as Squid, shown in Figure 12-32 Proxy serving takes some substantial processing, so many vendors sell proxy servers in a box, such as the Blue Coat ProxySG 510

applications: DM/Administrator, DM/Reporter, and DM/Manager These applications assist in preparing for the move to Windows 2000, but also may be quite useful as stand-alone applications with only Windows NT

The beta function is de ned by the following integral, where Re(m) > 0 and Re(n) > 0 : B(m, n) = t m 1 (1 t )n 1 dt

Figure 12-32

One of the first things you can do before migrating your PDCs is to flatten your domain converting multiple domains into a single larger domain DM/Suite not only helps with your flattening tasks but lets you adopt some of AD's functions now DM/Administrator will help you set up virtual domains and OUs in your existing Windows NT 40 environment, to better prepare for Windows 2000 Before you move a single user, DM/Reporter tool will indicate if it expects any problems with the process, based on your domain and user rights When you're ready, you can consolidate users, global groups, and local groups During the process, you have the option of changing user rights as well as group rights Subsequently, computer accounts are also transferred to the target domain DM/Manager walks you through the flattening process in a careful, always reversible, manner

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