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network connections If, for example, a building is wired with network connections in all rooms, including multiple connections for convenience and future expansion, these unused ports become open to the network One solution is to disconnect the connection at the switch, but this merely moves the network opening into the switch room The better solution is to disconnect it and disable the port in the switch This can be accomplished by connecting all unused ports into a VLAN that isolates them from the rest of the network Additional aspects of VLANs are explored in the Security Topologies section later in this chapter
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Routers
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Routers are network traffic management devices used to connect different network segments together Routers operate at the network layer of the OSI model, routing traffic using the network address (typically an IP address) utilizing routing protocols to determine optimal routing paths across a network Routers form the backbone of the Internet, moving traffic from network to network, inspecting packets from every communication as they move traffic in optimal paths Routers operate by examining each packet, looking at the destination address, and using algorithms and tables to determine where to send the packet next This process of examining the header to determine the next hop can be done in quick fashion Routers use access control lists (ACLs) as a method of deciding whether a packet is allowed to enter the network With ACLs, it is also possible to examine the source address and determine whether or not to allow a packet to pass This allows routers equipped with ACLs to drop packets according to rules built in the ACLs This can be a cumbersome process to set up and maintain, and as the ACL grows in size, routing efficiency can be decreased It is also possible to configure some routers to act as quasi application gateways, performing stateful packet inspection and using contents as well as IP addresses to determine whether or not to permit a packet to pass This can tremendously increase the time for a router to pass traffic and can significantly decrease router throughput Configuring ACLs and other aspects of setting up routers for this type of use are beyond the scope of this book NOTE ACLs can be a significant effort to establish and maintain Creating them is a straightforward task, but their judicious use will yield security benefits with a limited amount of maintenance This can be very important in security zones such as a DMZ and at edge devices, blocking undesired outside contact while allowing known inside traffic One serious operational security concern regarding routers concerns the access to a router and control of its internal functions Like a switch, a router can be accessed using SNMP and Telnet and programmed remotely Because of the geographic separation of routers, this can become a necessity, for many routers in the world of the Internet can be hundreds of miles apart, in separate locked structures Physical control over a router
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8: Infrastructure Security
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is absolutely necessary, for if any device, be it server, switch, or router, is physically accessed by a hacker, it should be considered compromised and thus such access must be prevented As with switches, it is important to ensure that the administrative password is never passed in the clear, only secure mechanisms are used to access the router, and all of the default passwords are reset to strong passwords Just like switches, the most assured point of access for router management control is via the serial control interface port This allows access to the control aspects of the router without having to deal with traffic related issues For internal company networks, where the geographic dispersion of routers may be limited, third-party solutions to allow out-of-band remote management exist This allows complete control over the router in a secure fashion, even from a remote location, although additional hardware is required Routers are available from numerous vendors and come in sizes big and small A typical small home office router for use with cable modem/DSL service is shown in Figure 8-2 Larger routers can handle traffic of up to tens of gigabytes per second per channel, using fiber-optic inputs and moving tens of thousands of concurrent Internet connections across the network These routers can cost hundreds of thousands of dollars and form an essential part of e-commerce infrastructure, enabling large enterprises such as Amazon and eBay to serve many customers concurrently
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