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Typically, the rst rule that applies to the packet is what happens with the data For example, with the foregoing rule if we have any inbound traf c destined for port 80 on IP address 24153489, it would be allowed through, but any other traf c would be compared against the following rule, which would deny the traf c at the rewall

gotoNext: method and implement the viewDidLoad method (Listing 12-22)

Application-Level Firewall The application-level rewall understands the data at the application level Application-level rewalls operate at the application, presentation, and session layers of the OSI model Data at the application level can actually be understood and monitored to verify that no harmful information is included An example of an application-level rewall is an Internet proxy or mail server Many uses are available through some form of proxy, but these functions usually provide security only at that level In addition, clients often must be con gured to pass through the proxy to use it ideally after they have authenticated themselves properly Proxy servers are also used to mask the original origin of a packet For example, an Internet proxy will pass the request on, but the source address listed in the packet will be that of the proxy server address and not of the

Electric field wires are mounted on free standing posts or chain link fences The wires are all mounted parallel to each other and to the ground which helps ensure uniform sensitivity along the entire fence length Since the electric field sensor has a self adjusting circuit located in the processor, false alarms from wind and ambient noise are not an issue as they are with other fence sensors Some conditions can cause unreliable detection and nuisance alarms in the electric field fence sensors The nuisance alarm rate for the electric field sensor is extremely low Weather conditions such as rain, snow, and lightning can create problems for the sensor Animals and vegetation along the fence line can also cause false alarms During installation, large spaces between the wires should be avoided since they may make it possible to move between the wires without detection The electric field fence sensor can be defeated by deep tunneling under or bridging over the protected fence Figure 7-21 shows the electric field sensor configuration patterns Figure 7-22 shows a three-wire and a four-wire sensor

11:

(Figure 12-20)

client that made the request The overall server doesn t just lter the packets; it actually takes in the original and retransmits a new packet through a different network interface

(continued)

The purpose of capacitance sensors is to detect a change in an electrostatic field The electrostatic field is produced by an array of wires, usually three wires spaced close together A low-voltage signal is used to create an electrical field in the fence and serves as the ground The differential capacitance between the sensor wires and the ground is continually measured Any change in the signal that is detected is sent to the process filter to determine if it is in the accepted range If the signal is not in the accepted range, it will initiate an alarm

Circuit-Level Firewall A circuit-level rewall is similar to an application proxy except that the security mechanisms are applied when the connection is established From then on, the packets ow between the hosts without any further checking from the rewall Circuit-level rewalls operate at the transport layer

Figure 12-20

As rewalls have evolved, additional feature sets have grown out of or have been added to the feature set of a rewall These features are used to provide faster access to Internet content and better security mechanisms to help protect network resources A few features that are implemented on rewall products, or are their own standalone products are discussed in the following subsections

to Next (Figure 12-21)