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Rule
Allow Deny
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
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
11:
Network Security
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
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
Other Firewall Features
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
Caching Servers Caching servers are used to cache Internet content on a server within your local LAN, so that if additional requests are made for the same content from a client, the content is delivered from the caching server not retrieved from the Internet a second time The bene t of such a technology is that you can conserve bandwidth on your Internet connection because the additional request for a resource that has been cached does not create network traf c on the Internet connection, but instead, uses bandwidth of the LAN There is no problem using LAN bandwidth because LANs are typically a lot faster than a company s Internet connection Proxy Servers By de nition, a proxy server is a server that performs a function on behalf of another system The employees who want to access the Internet perform the actions they normally would with their browser, but the browser submits the request to the proxy server The proxy server then transmits the request on the Internet and receives the results, which are sent to the original requester The bene t of a proxy is that anyone who captures the traf c sent out on the Internet would have the IP address of the proxy and not that of the internal network systems Some proxy servers implement caching features as well, allowing the administrator to lter the web sites that are allowed to be viewed by internal clients Port Filtering Port ltering is a major part of building rewall rules It is extremely important for you to be comfortable with the protocol (either TCP or UDP) and the port number used by an application to establish a socket Some
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