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CHAPTER 7 SE CURING N ETWORK TRA FFIC
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computer. If this connection cannot be established, the root kit is less likely to cause harm in your environment. Therefore, it is important to restrict outgoing access, as well as incoming access.
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Note We discuss root kits in more detail in 4.
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Tip Keep in mind that port management is a common task, and as an administrator, network management
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time should be allocated to this vital aspect of network security. Users on a network will frequently ask for certain ports to be opened that are not standard for many environments. Understand that this is common across many networks. For example, Apache Tomcat, a underlying component of the Apache web server, requires TCP port 8080 to be open for users to be able to access it from the outside, but it does not need to be enabled all the time. Tomcat is an example of just one web application that runs on a port other than 80 that users of most networks will require access to, in addition to other commonly used web, messaging, and file transfer ports.
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A demilitarized zone (DMZ) is a perimeter network, or a network area that sits between an organization s internal network and an external network. A DMZ is used to house insecure segments of a network and bridge them into more secure segments of a network. It should never house important or sensitive information. On consumer-grade routers, a DMZ typically refers to an address on a network that accepts all traffic bound to a specified address. In home environments, the DMZ is often configured incorrectly. We often find that it is used to forward all traffic to a specific address, rather than researching which ports need to be accessible for each service and segmenting the network traffic that shouldn t be included in the DMZ. This becomes a big security threat to the computer or network device that has all the traffic forwarded to it. Whether you choose to use a DMZ is not dependent on the size of your company but on whether you are using protocols that you think might easily be hacked and therefore would not want to live on your local network. For example, FTP is not a secure protocol. Relegating the use of FTP in your environment to a system that lives outside your local network would prevent standard FTP attacks, such as an FTP bounce attack (an all-too-common attack on FTP servers) from affecting the entire network infrastructure. To implement a DMZ, an administrator could simply put a second network between their firewall and the Internet or use their actual firewall to build the DMZ. Many firewall appliances even have a built-in DMZ port. Some administrators might choose to use a second subnet instead of a DMZ to keep certain types of traffic separate from the primary network. A subnet is a smaller portion a network segment, if you will of a larger network. Subnetting an IP network allows a single large network to be broken down into what appears (logically) to be several smaller ones. Devices on the same subnet have the same subnet mask and are signified on the network by that subnet mask.
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Rather than allowing your users to see one another, you could put them on separate subnets and not allow UDP-based protocols to bridge across the various subnets implemented in your environment. It is even possible to split a network into multiple subnets. Keep in mind, however, that the more complex the subnetting gets, the more difficult it becomes to troubleshoot problems on the network. For example, when an airport is introduced into an environment, a separate wireless subnet is created, and wireless users may have difficulty automatically finding printers that are located on the main network. The printers will need to be manually installed using their IP address.
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