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Primary Name Server A primary name server is the DNS server that contains the local zone database file. This file can be updated and is usually replicated to a secondary DNS server, through the zone transfer process, to provide fault tolerance. Secondary Name Server A secondary name server is not required on a network, but is highly recommended. It provides both fault tolerance and load balancing fea tures because it holds a copy of the zone file maintained by the primary DNS server. Caching-Only Server A caching-only server, as its name implies, caches the answers to queries and returns the results. This saves time and reduces network traffic because calls to multiple DNS servers are not required.

In the following exercise, you create and assign an IPSec policy, only to discover that the two computers cannot communicate at all. You can use a number of steps and tools to troubleshoot an IPSec policy, as described in the following list.

It is very important that an understanding of the components be mastered before taking the exam. Before a design of a DNS infrastructure can be considered, you should know the various DNS server types: primary, secondary, and caching-only.

IKE auditing is turned on by default. If auditing of logon events is turned on, IKE posts negotiation results in the Security Event log. Once policies have been assigned and are work ing, you can turn this feature off by adding the DisableIKEAudits value and setting it to 1. You should then stop and start the IPSec service. The value should be created at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\Audit.

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You can also increase the amount of information logged to the Security Event log by asking for per packet drop events. You perform this task by increasing the audit level to 7. You can either use Netsh or set the following Registry key to a value of 7: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPSec\EnableDiagnostics. Regardless of the method you use, you must restart the computer for the changes to take effect.

Determining the current namespace for an organization is quite simple. Since you have already gathered information on the Active Directory namespace design, you are able to answer the following question: Is the company using the same namespace design for both the public and the private network For example, if the company s public name is sales.contoso.com, is the internal Active Directory namespace also contoso.com Examples of the two DNS namespace designs are shown in Figures 6-2 and 6-3. You will have a chance to look at the design ramifications of this later, in Lesson 2. For now, you are only concerned with identifying and analyzing the current DNS namespace.

Is the policy assigned Use IPSec Monitor to tell you the currently active policy. Or use the Netsh Ipsec Static Show Gpoassignedpolicy command.

Troubleshooting Network Protocol Security 11-73

1. 2. 3. 4.

Active Directory: contoso.com (Internal Namespace) DNS Zone: contoso.com (External Namespace)

If the policy is different from the one you were expecting, which GPO is respon sible To find out, you can use the Netsh Ipsec Static Show Gpoassignedpolicy command or the Resultant Set Of Policy snap-in What are the details of the policy Use the Netsh Ipsec Static Show All command You are looking for confirmation that the policy is assigned and that its parameters are correct You can also find this information by using the IP Security Policy Man agement snap-in to view the policies for the local machine Is IKE negotiation succeeding Check the Security Event log If auditing is not turned on, use the Group Policy Object Editor snap-in to enable auditing IKE negotiation uses the Logon Events category to report success or failure If IKE negotiation is not succeeding, check IKE settings.

Are authentication, encryption, and key change the same for both computers If IKE is succeeding, is Quick Mode succeeding Check the Security Event log If Quick Mode is not succeeding, check to see that all Quick Mode encryption, integ rity, key strength, key change, and so on are the same Do filters make sense For example, if you are entering from and to IP addresses, are they mirrors If you are indicating on one computer from and to ports, is the other a mirror of this Are packets reaching the correct computer You can use Network Monitor to capture IPSec packets You will not be able to see any encrypted text; however, you will know whether packets are reaching the computer (You can view the source address) Also, you will know whether IPSec is being applied.

Active Directory: contoso.com (Internal Namespace)

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