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Caution
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Dynamic mode can be quite useful, for example, if you need to immediately initiate a change to IPSec processing. Although some IPSec commands require you to stop and start the IPSec service, others do not. However, Dynamic mode can also be a mixed blessing. Should you make a mistake in Dynamic mode, you will have no opportunity to discover it before imple menting the change. You could end up creating an incorrect configuration without warning.
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Using Netsh to Monitor IPSec You can use Netsh to monitor the current IPSec ses sion. Monitoring consists of either displaying policy information, getting diagnostics and logging IPSec information, or both. Any information you can find by running the IP Security Monitor snap-in, you can find by running Netsh. Displaying IPSec Policy Information First, of course, you might want to know what the current IPSec Policy is. To find out, you can use the Show command. If you choose to use the Show All command, a lot of information will be returned.
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Netsh ipsec static show all
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Sometimes it is useful to look at only a portion of the IPSec configuration information. A wide range of Show commands is available. Some are defined in Table 11-6. You can enter all commands from the Netsh IPSec Dynamic or the Netsh IPSec Static context, or, with modification, from the command line.
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Lesson 2
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Monitoring Network Protocol Security 11-33
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Table 11-6
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Netsh IPSec (Dynamic|Static) Show Commands
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Command Show Filterlist Name=filterlistname Show Gpoassignedpolicy Name=name Show Policy Name=policyname Show Rule Name=rulename
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Operation Displays a specific filter list Displays the policy assigned to the specified GPO Displays a specific policy Displays a specific rule
Obtaining Diagnostic IPSec Information One of the steps in diagnosing IPSec problems or just establishing that the policy is working like you think it should is to obtain information about the current policy. The Show commands described later in Table 11-7 provide that information. The information that each command reveals iden tifies the settings in the policy. For example, the Show Filterlist command lists the infor mation in the policies filter list. Filter list options were listed in Table 11-6. Some examples of the Show command syntax are illustrated next. In the commands, the equal sign is part of the command and the italicized words are replaced by some value as indicated below the command.
Show All Resolvedns=value Resolves the DNS or NetBIOS computer name associated with an IP address. This command might assist you in determining whether the policy is affecting the right computer. Show Mmsas Displays information on the IPSec Main Mode SA. You can see the source and destination addresses. When used with the Resolvedns=yes switch, the names of the computers are also displayed. Show Qmsas Displays information about the IPSec Quick Mode SAs. Show Stats Displays the IKE Main Mode statistics, IPSec Quick Mode statistics, or both. The statistics are the same ones described in Table 11-8, in the section Understanding Main Mode and Quick Mode Statistics in IP Security Monitor later in this chapter.
In addition to Show commands, you can use several Dynamic mode Netsh IPSec diag nostic commands to obtain diagnostic information, such as the following:
Set Config Property=Ipsecdiagnostics value=value Can be set with a value of 0 through 7, indicating the level of IPSec diagnostic logging. The default is 0, which means logging is disabled. The level 7 causes all logging to be performed. The computer must be restarted for logging to begin. Set Config Property=Ipsecloginterval value=value Indicates how frequently in seconds the IPSec events are sent to the system event log. The range is 60 to 86,400 with a default of 3600.
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11
Managing Network Security
Set Config Property=Ikelogging value=value Can be set with a value of 0 or 1, determining whether IKE (Oakley) logging will occur. This command produces a log with a copious amount of information. You must be familiar with the RFCs at the expert level to completely understand the Oakley logs. Set Config Property=Strongcrlcheck value=value Determines whether cer tificate revocation list (CRL) checking is used. If 0, CRL checking is disabled. If 1 is the value, certificate validation fails only if the certificate is revoked. Level 2 fails if any CRL check error occurs. A CRL check fails if the CRL cannot be located on the network.
You can make other diagnostic efforts by modifying the current policy to reduce secu rity. For example, if you change authentication to Shared Secret on both computers instead of Kerberos or Certificates, you eliminate the possibility that the problem is related to authentication. Netdiag.exe is a command-line tool that you can use to dis play IPSec information as well as to test and view network configuration. Netdiag is available for Windows Server 2003, Windows 2000, and Windows XP. However, it must be installed in a different way for each operating system. For Windows Server 2003, Netdiag is installed with the Windows Server 2003 Support Tools. For Windows 2000, Netdiag is included with the Windows 2000 Resource Kit tools that you can also download from the Internet. It is also available on the Windows XP Installation CD-ROM, and is installed by running Setup.exe from the Support\Tools folder. You can obtain general network diagnostic information (not IPSec-specific) by using the Netdiag command. For example, the Netdiag /v /l command provides the IP configura tion and routing configuration for a computer, tests WINS and DSN name resolution, reports the build version of the computer and the hotfixes that are installed, tests the validity of domain membership, verifies contacts by member computers with their domain controllers, and checks trust relationships. All of this information can be useful in eliminating general networking problems before attempting to diagnose IPSec issues. However, although the Netdiag.exe tool is available for Windows Server 2003, the Net diag /test:ipsec option is removed. Use the Netsh command instead. Because Netsh IPSec context commands will not work with downlevel Windows computers, use Net diag for them. You might want to remotely examine the IPSec policy of a computer running Windows XP or Windows 2000 that is communicating, or attempting to com municate, with Windows Server 2003. In this case, use a remote desktop session and the Netdiag tool.
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