qr code generator vb net Lesson 1: Securing Network Traffic in .NET framework

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Lesson 1: Securing Network Traffic
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You can also use the IP Filter Wizard to create a mirrored filter. A mirrored filter matches the source and destination with the exact opposite addresses, so that, for example, you can easily configure a filter that captures POP3 traffic sent to and from the local address. To configure your filter as a mirrored filter, leave the Mirrored check box selected on the first page of the IP Filter Wizard, as shown in Figure 10-10.
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Figure 10-10 Creating a mirrored IP filter
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Exam Tip Most network applications depend on two-way communications and therefore require a mirrored f ilter for their traff ic to be adequately secured. If you have conf igured a f ilter with the proper source and destination but your IPSec rule still isn t working as expected, the problem could be that you have not conf igured the f ilter as a mirrored f ilter. 4. Filter Action page After you have attached the desired IP filter list to the rule, you can specify a filter action for the rule in the Security Rule Wizard. In Group Policy the following three IP filters are predefined for IPSec policy rules:
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Permit This filter action permits the IP packets to pass through unsecured. Request Security (Optional) This filter action permits the IP packets to pass through unsecured but requests that clients negotiate security (preferably encryption). Require Security This filter action triggers the local computer to request secure communications from the client source of the IP packets. If security methods (including encryption) cannot be established, the local computer will stop communicating with that client.
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To create a new filter action, click the Add button on the Filter Action page, as shown in Figure 10-11. This procedure launches the Filter Action Wizard.
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Managing Network Security
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Figure 10-11 Creating a new filter action
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5. Authentication Method page Security can be negotiated only after the IPSec clients are authenticated. By default, IPSec rules rely on Active Directory directory service and the Kerberos protocol to authenticate clients. However, you can also specify a certificate infrastructure or a preshared key as a means to authenticate IPSec clients. To select the authentication method for IPSec, you can use the Authentication Method page of the Security Rule Wizard, as shown in Figure 10-12.
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Figure 10-12 Specifying an authentication method for a new IPSec policy rule
Lesson 1: Securing Network Traffic
Exam Tip For the 70-622 exam, you need to know how to create an IPSec policy. This means that you need to be familiar with the IP Security Policy Wizard, the Security Rule Wizard, the IP Filter Wizard, and the Filter Action Wizard. For more information on how to use these wizards, see the practice session at the end of this lesson.
Managing IP Filter Lists and Filter Actions
The IP filters, IP filter lists, and filter actions you create for an IPSec rule can be shared with other IPSec rules. You can also create and configure these features outside of the Security Rule Wizard. To do so, right-click the IP Security Policies node in Local Security Policy or a GPO, and then click Manage IP Filter Lists And Filter Actions, as shown in Figure 10-13.
Figure 10-13 Managing IP filter lists and filter actions
Creating and Configuring a Connection Security Rule
To create a Connection Security Rule in the WFAS console tree, right-click the Connection Security Rules node, and then click New Rule from the shortcut menu. (Be sure to select the Connection Security Rules node directly beneath the root node in the console tree and not the Connection Security Rules node beneath the Monitoring node.) This procedure, which launches the New Connection Security Rule Wizard, is shown in Figure 10-14.
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Managing Network Security
Figure 10-14 Creating a new Connection Security Rule
Using the New Connection Security Rule Wizard
The specific pages you see when you use the New Connection Security Rule Wizard depend on the type of rule you choose to create on the first page. The following section describes the six pages you would find when creating a custom rule.
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