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other calling routers The VPN router can be configured to obtain IP addresses from DHCP or from a manually configured set of address ranges. Using DHCP to obtain IP addresses simplifies the configuration; however, you must ensure that the DHCP scope for the subnet to which the site connection of the calling router is attached has enough addresses for all the computers physically connected to the subnet and the maximum number of PPTP and L2TP ports. For example, if the subnet to which the site connection of the VPN router is attached contains 50 DHCP clients, the scope for the default configuration of the VPN router should contain at least 307 addresses (50 computers + 128 PPTP clients + 128 L2TP clients + 1 address for the VPN router). Also, note that the Routing And Remote Access service is designed to grab 10 addresses from the DHCP scope at a time. Once the set of 10 is used up, the server will request another 10 addresses. If there are not enough IP addresses in the scope, remote access VPN clients and calling routers that connect after all the addresses in the scope are allocated will be assigned an address in the Automatic Private IP Addressing (APIPA) range of 169.254.0.0/16. If you configure a static pool of addresses, ensure that the pool has enough addresses for all your PPTP and L2TP ports, plus an additional address for the VPN router. If there are not enough addresses in your static pool, remote access VPN clients and Windows NT 4.0 RRAS calling routers will not be able to connect. Windows Server 2003 calling routers, however, will still be able to connect. Windows Server 2003 calling and answering routers will still

12-16

performed carefully, part of the care being clear documentation. As usual, if documenting becomes too onerous, rewrite the code to reduce the use of global data.

12

In 3, Monitoring and Troubleshooting TCP/IP Connections, you installed the lite version of Network Monitor. This version comes with Windows Server 2003 and is pretty powerful for a free tool. However, remember that Microsoft has a more powerful full version of the Network Monitor tool. The full version of the tool, which is available only by purchasing Microsoft Systems Management Server, handles two tasks that the lite version cannot:

Document the source of algorithms that are used If you have used an algorithm from a book or magazine, document the volume and page number you took it from. If you developed the algorithm yourself, indicate where the reader can find the notes you ve made about it. Use comments to mark parts of your program Some programmers use comments to mark parts of their program so that they can find them easily. One such technique in C++ and Java is to mark the top of each routine with a comment such as

VPNs provide a solution that allows a department s LAN to be physically connected to the organization s internetwork but technically shielded and protected by a VPN

It can run in promiscuous mode; in other words, it is able to capture 100 percent of the network traffic. It enables you to see where else Network Monitor is running. This information is useful when you are setting up multiple monitoring stations across your network and then using a central monitoring point to collect the data. You can also use it to monitor and prevent inside hack attempts by tracking down offenders, as shown in Figure 12-14.

Figure 12-14

This allows you to jump from routine to routine by doing a string search for /**. A similar technique is to mark different kinds of comments differently, depending on what they describe. For example, in C++ you could use @keyword, where keyword is a code you use to indicate the kind of comment. The comment @param could indicate that the comment describes a parameter to a routine, @version could indicate file-version information, @throws could document the exceptions thrown by a routine, and so on. This technique allows you to use tools to extract different kinds of information from your source files. For example, you could search for @throws to retrieve documentation about all of the exceptions thrown by all of the routines in a program. This C++ convention is based on the JavaDoc convention, which is a wellestablished interface documentation convention for Java programs (java.sun.com/j2se/javadoc/). You can define your own conventions in other languages.