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When two computers on different networks are communicating, they are often sending packets across multiple routers, allowing traffic to be susceptible to a variety of security holes at each stop along the way. Even with good inspection on a firewall, an attacker can still perpetrate a man-in-the-middle attack, or an attack where someone spoofs a trusted host while sitting between your server and a user accessing your server. A man-in-themiddle attack is designed to intercept all the traffic between two points, either in order to eavesdrop, or to insert malicious traffic. To keep prying eyes off your data, it is important to implement encryption techniques on your communications, rendering the data unreadable to the interceptor. If your data are passing from your home to your office, for example, you would implement a VPN. If you are taking customer data over web sites, then you might consider using SSL. We discuss using VPN and SSL further in 15.
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Understanding Switches and Hubs
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Hubs are dummy devices that connect multiple computers, making them act as a single segment on a network. With hubs, only one device can successfully transmit data at a time. When two computers submit data at the same time, a collision occurs, and a jam signal is sent to all the ports when collisions are detected. This makes one computer able to cause collisions and force an entire network to slow down while packets that were jammed are re-sent by all the computers that attempted to communicate during
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CHAPTER 10: Securing Network Traffic
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the jam. Hubs will also allow any computer to see the packets sent by all other computers on the hub. Switches are more advanced than hubs and provide expandability, allowing more switches, ports, and computers to exist on a network. Switches perform collision detection and isolate traffic between the source of a packet and its destination. Because each computer is not automatically able to see all the traffic from other computers, this is a more secure communications environment. Switches are less likely to become flooded with collisions and offer faster throughput and lower latency. We advise against the use of hubs as a general rule, unless you have a very explicit reason to use them, because they can act as potential collision centers and cause security breaches. However, hubs do still have limited usefulness in networks. Switches respond to loops, hubs do not. When a cable is plugged into a switch twice, it can cause unwanted network traffic. In areas where many users are plugging in their laptops, a cable can get plugged back into a switch by accident, and some network administrators will use a hub to keep this from occurring. Additionally, protocol analyzers connected to switches do not always receive all the desired packets since the switch separates the ports into different segments. Connecting a protocol analyzer to a hub will allow it to see all the traffic on the network segment. Finally, some cluster environments require each computer to receive all the traffic going to the cluster. In these situations, hubs will most likely be more appropriate than switches. NOTE: Many managed switches can be configured to act as though they are hubs, so you can get the capabilities you require while maintaining flexibility for more advanced features. However, this can be a security risk and so when convenient you should disable remove configuration on switches. Stacked switches are switches designed to accommodate multiple switches in a network. When a switch is stackable, it will have dedicated ports for adding more switches that allow speeds of 10 or more gigabits between the switches, using special stacking cables. These are often converted into fiber connections so that latency is optimized over long distances.
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