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Routing with Windows Server 2003
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Figure 9-38 Configuring packet filters
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4. On the General tab, click either Inbound Filters or Outbound Filters. 5. In the Inbound Filters dialog box or the Outbound Filters dialog box, click New. 6. In the Add IP Filter dialog box, type the settings for the filter, and then click OK. 7. In Filter Action, select the appropriate filter action, and then click OK.
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You can also define packet filters in a remote access policy profile. Remote access policies, which are discussed in 10, allow you to apply rules and restrictions to spe cific remote access connections. By defining packet filters and the remote access policy level, you can apply different levels of access restrictions to different users.
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Basic Packet Filtering Scenario
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In a basic packet filtering scenario implemented on Windows Server 2003, two packet filters are configured on an external interface. These packet filters allow unsolicited connections to a Web server hosted on an internal network. Such a scenario, in which a Web server is hosted at the address 207.46.22.1, is illustrated in Figure 9-39. Packet filter #1 is configured as an input filter and specifies a destination IP address of 207.46.22.1 with a mask of 255.255.255.255. This filter then specifies the protocol TCP and associated Web service port of 80. Once the filter is configured, the filter action in the Inbound Filters dialog box is set to Drop All Packets Except Those That Meet The Criteria Below.
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Configuring Packet Filters
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Packet filter #2 is configured as an output filter and specifies a source IP address of 207.46.22.1 with a mask of 255.255.255.255. This filter then specifies the protocol TCP and associated Web service port of 80. Once the filter is configured, the filter action in the Outbound Filters dialog box is set to Drop All Packets Except Those That Meet The Criteria Below.
1 Input filter Internal Interface Internal Network External Interface Internet
Web Server 207.46.22.1
Windows Server 2003 (Firewall) Output filter 2
F09NI39
Figure 9-39
Basic packet filtering
Locked-Down Packet Filtering Scenario
In a packet filtering implementation designed for locked-down security, four filters are created for access to each service. As shown in Figure 9-40, one packet filter in this scenario is designed to match each of the four steps required for communication.
2 Output filter Internal Interface Internal Network 1 Input filter External Interface Internet
Web Server 207.46.22.1
Windows Server 2003 (Firewall) Input filter 3 Output filter 4
F09NI40
Figure 9-40
Locked-down packet filtering
9-72
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Routing with Windows Server 2003
In the case of an internal Web server, each packet filter indicates a protocol of TCP, an associated port of 80, and the IP address of the Web server (207.46.22.10) as either a source or destination, as appropriate: 1. External interface, input filter: Destination address 207.46.22.10/32, ProtocolTCP port 80 2. Internal interface, output filter: Destination address 207.46.22.10/32, ProtocolTCP port 80 3. Internal interface, input filter: Source address 207.46.22.10/32, Protocol-TCP port 80 4. External interface, output filter: Source address 207.46.22.10/32, Protocol-TCP port 80 The set of packet filters is then configured to deny all other traffic.
Off the Record On the topic of packet filtering, exam reality definitely differs from real-world reality. In real-world reality, most administrators use a dedicated firewall product and simply define a single, bidirectional filter on the external interface of that firewall to provide access to a given internal service.
But that scenario would just be too simple for the MCSE exam. On the exam, you re likely to see a question on packet filtering in which each answer choice lists a confusing array of four packet filters for each protocol session. Typically, at least two of the answer choices specify the correct port numbers, so it s up to you to determine which answer choice has correctly defined the filter directions on each interface. Such questions aren t easy, but if you can visu alize the four steps in communication required through the external and internal interfaces, you should be in good shape.
Advanced Packet Filtering Scenarios
Unlike Web servers, many other services communicate over more than one channel. Point-to-Point Tunneling Protocol (PPTP) traffic, for example, uses TCP port 1723 to create and maintain a VPN connection and IP protocol 47 to send data over that con nection. To support remote users connecting through PPTP to an internal VPN server, then, you must create one set of packet filters for TCP port 1723 and another set for protocol number 47. Each set of packet filters follows the input and output pattern shown in either Figure 9-39 or Figure 9-40.
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