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Configuring iPsec to secure network traffic
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In this lab you will enable IPsec with a symmetric key between the Windows XP client and Windows Server so that hackers capturing network traffic can t view the data submitted between the XP client and the server 1 Before enabling IPsec, you may want to verify that you can capture data submitted into the web site of the Windows server from the Windows XP client
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2 On the server, start capturing network traffic with Network Monitor 3 Go to the Windows XP client and type the address of the server in a web browser to access the web site In Windows XP, type a credit card number into the site and then click Submit 4 Go to the 2000 Server and stop capturing the network traffic; view the packet capture to determine whether you can see the credit card number submitted (as shown in the following illustration)
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5 The goal of this exercise is that after IPsec has been enabled, you would not be able to view credit card information typed into the site Also note that the preceding screenshot is from a packet capture called BeforeIPSeccap stored in the LabFiles\PacketCaptures folder
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enabling iPsec on the Windows server
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6 To enable IPsec on the Windows server, select Start | Programs | Administrative Tools | Local Security Policy 7 In the Local Security Policy, select IP Security Policies on Local Machine (as shown in the following illustration)
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8 Right-click Secure Server and choose Properties 9 In the properties of the IPsec policy, click the Edit button (as shown in the following illustration) to edit the default policy
10 Choose the Authentication Methods tab to set the encryption key used by IPsec You will notice that the default authentication method used by IPsec is Kerberos (as shown in the following illustration) Click Edit to change the authentication method
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11 Select Use this string to protect the key exchange, and type the string of mySecret (as shown in the following illustration) this string is case sensitive
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12 Select OK twice 13 Click Close 14 Now that you have configured the IPsec policy with the encryption key, you will assign the policy to the system, telling the system to use the policy Right-click the Secure Server policy and choose Assign (as shown in the following illustration)
15 When the policy is being used, it will have a little green diamond on it When you wish to stop using IPsec, you can unassign the policy by rightclicking it and choosing Unassign
Configuring Windows xP for iPsec
16 Now that the Windows server has been configured for IPsec, we will configure a Windows XP client for IPsec as well This way any data sent between the Windows XP client and the Windows server will be encrypted Select Start | All Programs | Administrative Tools | Local Security Policy 17 In the Local Security Policy, select IP Security Policies on Local Machine 18 Right-click Secure Server and choose Properties 19 In the properties of the IPsec policy, click Edit to edit the default policy 20 Choose the Authentication Methods tab to set the encryption key used by IPsec You will notice that the default authentication method used by IPsec is Kerberos Click Edit to change the authentication method 21 Select Use this string to protect the key exchange, and type the string of mySecret again, this string is case sensitive
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22 Select OK twice 23 Click Close 24 Now that you have configured the IPsec policy with the encryption key, you will assign the policy to the system, telling the system to use the policy Right-click the Secure Server policy and choose Assign 25 Windows XP is now using IPsec To verify that data is encrypted, capture the network traffic from the Windows XP client to the Windows server by using Network Monitor, submitting the credit card number into the web site again The following screenshot shows the network traffic captured Notice that you cannot tell which traffic is the HTTP traffic as opposed to other traffic because it is all Encapsulated Security Payload (ESP) traffic, which is the encryption protocol used by IPsec The following illustration is from the capture file called AfterIPSeccap in your LabFiles\PacketCaptures if you want to view the IPsec-enabled traffic
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