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4. Open the Administrative Tools, Services console. 5. From the Action menu, select Connect To Another Computer. 6. On Computer1, scroll to the telnet service. Is the telnet service running

for i = 1 to maxElmts 1 -- fixed error #A423 10/1/92 (scm)

7. Start the service. 8. Open the IP Security Management console and examine the IP Security Policies On Local Computer node and the IP Security Policies On \\Computer1 node. Is a new policy, one you have never seen before, assigned at both nodes

Dial-in properties behavior of user accounts Security (authentication protocols and encryption) Remote access policies usage Windows or Remote Authentication Dial-In User Service (RADIUS) usage (for authentication, authorization, and accounting)

11-84

Adding such a comment can be gratifying after a late-night debugging session on software that s in production, but such comments really have no place in production code. Such comments are handled better by version-control software. Comments should explain why the code works now, not why the code didn t work at some point in the past.

11

9. Unassign the policies on both Computer1 and Computer2. 10. From the command prompt on Computer2, attempt to telnet to Computer1. Are you successful

Use of endline comments to mark 8 ends of blocks is described 9 further in Commenting 0 Control Structures, later in this section.

Internet Protocol (IP) address assignment and configuration PPP features usage, such as Microsoft Point-to-Point Compression (MPPC),

11. One or both of the policies must be the problem. Move on to the next exercise to troubleshoot the policies.

Use endline comments to mark ends of blocks An endline comment is useful for marking the end of a long block of code the end of a while loop or an if statement, for example. This is described in more detail later in this chapter.

Troubleshooting IPSec is no different than troubleshooting anything else. You use your knowledge of which parameters are necessary and the available troubleshooting tools to resolve the issue. 1. Think about the order in which actions occur in a policy. What are the steps

2. In the IP Security Management console, select IP Security Policies On The Local Computer, and double-click the assigned policy. 3. Click Edit to edit the IP filter list. 4. In the IP Filter List box, double-click the filter with its option selected, and then double-click the IP filter. Is the source address My IP Address

Aside from a couple of special cases, endline comments have conceptual problems and tend to be used for code that s too complicated. They are also difficult to format and maintain. Overall, they re best avoided.

Multilink PPP, and Bandwidth Allocation Protocol (BAP)

11

Managing Network Security 11-85

Most comments in a well-documented program are one-or two-sentence comments that describe paragraphs of code. Here s an example:

5. Change the IP address to Computer1 s address. The subnet mask should be dimmed. 6. Click OK four times to close the policy. 7. Select the IP Security Policies On Computer1 node and double-click the Active policy. There are two rules to examine here. 8. Select the first rule and check its filter action by clicking the Filter Action tab and double-clicking the selected filter action. What is the filter action

9. Click OK, and then select the IP Filter List tab. 10. Double-click the selected filter action, and then double-click the filter. Is the source address a specific IP address, and is it correct (Is it the address of Computer2 )

authentication and accounting logging, and tracing While the concept of demand-dial routing is fairly simple, configuration of demanddial routing is relatively complex. This complexity is due to the following factors:

// swap the roots oldRoot = root[0]; root[0] = root[1]; root[1] = oldRoot;

11. Change the source address to the address of Computer2. Then click OK four times to close the policy. Now that the IP addresses are correct, the best way to see whether any other prob lems are present and if so, where they are occurring, is to trigger the rule and examine the information produced in the IP Security Monitor snap-in. 12. Return to the IP Security Management console on Computer2. Assign each policy. 13. From the command prompt on Computer2, attempt to telnet to Computer1. 14. Return to the IP Security Management console, IP Security Monitor for Computer1 and select the Main Mode Statistics node. Are any authentication failures present