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TABLE 11-6
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80 20 21 25 53 53 3389
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Widely Used Network Services and Their Associated Ports and Protocols
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of the popular port values and associated protocols for popular network services are listed in Table 11-6
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Direction of Transfer When creating a rewall rule you not only need to supply the layer-3 and layer-4 address information, you also need to specify the direction of the traf c Most times you will focus on inbound traf c for each of the rewall rules, but you may also control outbound traf c Source or Destination Address On the rewall, we can lter packets based on the source or destination IP address contained in the IP header of the packet This is a critical tool along with the port number (layer-4 header) because if you want to allow traf c into your network only from one of your other locations, you can specify the source address of your other location in the rewall rule A nice feature of layer-3 ltering is that if you detect an intruder accessing the company network from the Internet, you can block any data coming into the network from the IP address of the intruder to help secure your data
EXERCISE 11-4 Enabling a Windows XP/Windows Server 2003 Firewall
In this exercise you will enable the rewall feature on Windows XP or Windows 2003 to block all traf c with the exception of allowing clients to reach the web server that you are hosting and to allow clients to terminal into your server
11:
Network Security
Determining Ports to Open
In this part of the exercise you will determine which ports are used by services such as web servers and terminal servers so that you can open those ports on your rewall once it is enabled 1 First plan which ports will need to be opened on the rewall by lling in the following table Service
HTTP SMTP RDP (Terminal Services)
Port Number
Protocol (TCP or UDP)
2 Once you have determined the three ports that will be enabled, on your Windows Server 2003 system select Start | Control Panel | Network Connections, and right-click your Local Area Connection, and choose Properties (as shown in the following illustration)
Firewalls and Proxy Servers
3 Click the Advanced page tab 4 On the Advanced page tab, enable the Protect my computer and network checkbox to enable the Windows 2003 or Windows XP rewall (as shown in the following illustration)
5 Click the Settings button at the bottom of the dialog box 6 In the Advance Settings dialog box you can specify which traf c you want to allow to pass through the rewall by selecting the appropriate protocols Select the checkbox beside Web Server (HTTP)
11:
Network Security
7 Once you click the Web Server checkbox, the Service Settings dialog box appears (as shown in the following illustration) Notice that port 80 is chosen at the bottom left of the dialog box and that TCP is selected bottom right
8 Click OK 9 Select the checkbox beside the Remote Desktop service The protocol information is displayed Notice that Remote Desktop (RDP) uses TCP 3389, and then click OK 10 Select the checkbox beside Internet Mail Server (SMTP), and then click OK 11 You should now have three services selected to allow traf c to pass through the rewall checkbox
Securing Communication
12 Click OK twice
CERTIFICATION OBJECTIVE 1103
Securing Communication
As more companies go online with the Internet, the need to protect data becomes more prevalent The information technology industry has striven to provide a more secure data transfer mechanism because TCP/IP was not designed as a secure network protocol You can keep up to date with worldwide vulnerabilities affecting all vendors by visiting http://wwwcertorg (Computer Emergency Response Team)
11:
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