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multiple simultaneous connections to the Internet, look at Table 4.1 and consider the following: Hosts A and B are communicating with an Internet Web server with IP address 131.107.178.205.
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Table 4-1. NAT Port-Mapping Table Local Socket
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Host C is communicating with an FTP server with IP address 131.107.37.221 over TCP ports 21 and 20.
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192.168.1.1:1025
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131.107.1.1:1025
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131.107.178.205:80
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192.168.1.2:1027
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131.107.1.1:1026
131.107.178.205:80
192.168.1.3:1025
131.107.1.1:1027
131.107.37.221:20
192.168.1.3:1026
131.107.1.1:1028
131.107.37.221:21
The NAT device keeps track of each connection by mapping a unique port to each connection. Notice that all IP address and port combinations (IP sockets) are unique in the table. The NAT device uses the official IP address 131.107.1.1 repeatedly, assigning a unique TCP port each time.
NAT obscures and protects the internal network (also known as the stub network). The NAT server could still be a target for attack from the external network. If the NAT server is compromised, the organization's Internet access could be lost. Further, hosts inside the private network might also be compromised. The NAT server needs protection, such as a virus scanner, firewall, and intrusion-detection software (discussed in the next lesson). If the NAT server allows remote administration, disable this feature or configure the most secure methods for authentication and encryption available. Using VLANs Intranet switches can be used to create VLANs on the intranet. VLANs are essentially virtual subnets that are created by switches and supported by routers that are VLAN enabled. Switches create VLANs by tagging the data frames that they receive from hosts. Each port on the switch can be associated with a VLAN, which behaves like an IP subnet and might require routing to communicate with hosts on other VLANs. Although the physical connections on the network might not change, VLANs can change the network infrastructure. For example, you can use VLANs to segment all of the servers on your network
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into one subnet. Frame tagging is not the only method for creating a VLAN, but it is the generally accepted method standardized by IEEE 802.1q. You can locate this specification on the Institute of Electrical and Electronics Engineers, Inc. Web site at http://ieee.org. VLANs control broadcast traffic and each VLAN is considered a broadcast domain because all hosts on a VLAN are able to send broadcast traffic to all hosts on a VLAN. Broadcast traffic is not allowed to pass beyond the logical confines of the VLAN. Routers are typically used to connect VLANs, so that hosts on separate VLANs are able to communicate.
As a security benefit, VLANs can hide the true physical configuration of your network. They can also be used to isolate certain hosts without costly reconfiguration of your physical network infrastructure.
Because switches create VLANs, compromising a switch could compromise the VLAN. If an attacker takes control of (or sabotages) a switch hosting one or more VLANs, VLAN hosts might also be vulnerable to compromise. At a minimum, communications traversing the switch might be exploited or disrupted in such an attack.
To protect your VLANs, you must ensure that your switches, VLAN-enabled devices, and the segments between them are secure. Keep up with security bulletins concerning your VLAN-enabled devices and apply all software patches as soon as they are available.
Exercise: Selecting Infrastructure Security Measures Each of the statements in the left column describes a technology discussed in this chapter. Match the terms in the right column with the descriptions in the left column.
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1. 1. Used to secure and encrypt network data transmitted between partner networks 1. 2. 2. The area between the internal and external network typically used to provide semisecure services to the external network 2. 3. 3. A device that can be used to create screened subnets and separate the internal network from the external network 3. 4. 4. Can mask your internal IP address range and allow multiple hosts to share a single IP address 4.
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