vb.net data matrix generator Add rule name= telnetN policy= telnet filterlist= telnet computer2 in .NET framework

Generator Code-128 in .NET framework Add rule name= telnetN policy= telnet filterlist= telnet computer2

Add rule name= telnetN policy= telnet filterlist= telnet computer2
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filteraction= negotiate computer2 telnet
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Kerberos=yes description= this rule negotiates telnet if the source computer is
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Monitoring Network Protocol Security 11-63
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Note that the rule ties the filter list and the filter action and selects the authentica tion method. If no authentication method is specified, Kerberos is used by default. 6. Prepare the filter list and filter action for the second rule. Create a filter list with one filter that triggers on telnet and blocks telnet from all computers:
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Add filter filterlist= blocktelnet
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srcaddr=Any dstaddr=Me description= all telnet to computer1
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protocol=TCP mirrored=yes srcmask=24 dstmask=24 srcport=0 dstport=23
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7. Add a filter action to block all telnet communications:
Add filteraction name= block all telnet inpass=yes action=block
8. Add a rule that will manage this telnet negotiation:
Add rule name= telnetN policy= telnet filterlist= blocktelnet
filteraction= block all telnet
Kerberos=yes description= this rule negotiates telnet if the source computer is
computer2
9. Assign the policy:
set policy name=telnet assign=yes
10. On Computer 2, log on as Administrator and open a command prompt. 11. Open Netsh. On Computer2, a single filter list, filter, and filter action are necessary. You are providing it the means to negotiate the telnet connection with Computer1. First, create the policy. 12. Type the following command:
Add policy name= telnet
description= only allow negotiated telnet to computer1 from computer2
activatedefaultrule=no mmsecmethods= 3DES-MD5-3
13. Next, create the filter list:
Add filter filterlist= telnet computer1
srcaddr=Me dstaddr=192.168.0.2 description= computer2 telnet to computer1
protocol=TCP mirrored=yes srcmask=32 dstmask=32 srcport=0 dstport=23
14. Next, create the filter action:
Add filteraction name= negotiate computer2 telnet qmpfs=no inpass=no soft=no action=negotiate
15. Then add the rule that will manage telnet negotiation:
Add rule name= telnetN policy= telnet filterlist = telnet computer1
filteraction= negotiate computer2 telnet
Kerberos=yes description= this rule negotiates telnet to computer1
11-64
11
Managing Network Security
16. Finally, assign the policy. Remember, only one policy can be active at a time. You must run this command at both computers.
set policy name=telnet assign=yes
17. Close Netsh.
Exercise 4: Use Netsh to Monitor IPSec
After you have created and assigned the IPSec policy using Netsh, use Netsh com mands to monitor the session. 1. From either computer, start Netsh:
Netsh
Netsh>ipsec static
2. Use the Show command and review the active policy to see whether your policy application worked:
show policy name=telnet level=verbose
3. Enter Dynamic mode:
dynamic
4. Set the diagnostic value to log all events (the default is 0 or no logging) using this command:
set config property=ipsecdiagnostics value=7
5. Set the IPsecloginterval value to 60 seconds:
set config property=ipsecloginterval value=60
6. Display information about Main Mode and Quick Mode SAs using the Show Mmsas All (Figure 11-36) and Show Qmsas All (Figure 11-37) commands.
Figure 11-36
Viewing IKE Main Mode statistics
Lesson 2
Monitoring Network Protocol Security 11-65
Figure 11-37 Viewing Quick Mode statistics
7. Type quit to exit Netsh.
Exercise 5: Use IP Security Monitor to Monitor an IPSec Connection
In this exercise, you monitor IPSec activity using the IP Security Monitor snap-in. 1. Open IP Security Monitor on both computers by adding the snap-in to an MMC. 2. Check that the active IPSec policy is the one you assigned. 3. Examine the details about the active policy. Are the details what you expected
4. Select the Main Mode (Figure 11-38) and Quick Mode (Figure 11-39) Security Associations nodes and double-click the SA in the details pane. This step tells you which encryption is being used.
11-66
11
Managing Network Security
Figure 11-38
Main Mode SA showing information about encryption
Figure 11-39
Quick Mode SA verifying connection and encryption
5. Examine the Quick Mode Statistics node. 6. Close the windows.
Lesson 2
Monitoring Network Protocol Security 11-67
Exercise 6: Use Netcap to Capture Network Security Protocol Information
1. On Computer1, create a Test1.txt file by right-clicking the Shared Captures folder in Windows Explorer, selecting New, and clicking Text Document. Then type the name test1.txt and click OK. 2. On Computer2, Click Start, select All Programs, select Windows Support Tools, and click Command Prompt. 3. Run Netcap with a buffer size of 1 MB and save the capture file to C:\Authentica tion.cap (Figure 11-40). To do so, type this command:
netcap /c:c:\authentication.cap /n:0
Figure 11-40 Using Netcap to start and stop a capture without loading Network Monitor
4. While the capture is running, connect to the \\Computer1\My Captures share on the domain controller and double-click the Test1.txt file to open it in Notepad. 5. Make a change in the file and save it. An Access Denied error message appears because the default share permissions are Everyone Read. 6. From another command prompt, telnet to the domain controller using the follow ing command:
telnet computer1
7. Return to the command prompt for Netcap and press the Spacebar to stop the capture. The name of the capture file is listed. 8. Open the capture file in Network Monitor and look for evidence of the file being read. The text in the file should be displayed in clear text. 9. Look for the ISAKMP negotiation and ESP frames. Answer the following question in the space provided. What do the frames tell you
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