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his chapter will introduce you to the application inspection features for multimedia applications Like FTP, VoIP, and other applications, multimedia applications use multiple connections to set up and transmit video streams, voice connections, and/or multimedia capabilities Most multimedia applications follow either the RTSP or H323 standards The topics discussed in this chapter include An overview of multimedia applications RTSP H323
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Multimedia applications pose many of the same problems for firewalls and security appliances that I have so far discussed in Part III One of the main reasons that multimedia applications are difficult to deal with is that no single unifying standard defines how they should be implemented Each vendor, instead, has developed its own implementation method for its multimedia applications with a handful of existing standards
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The following are some of the problems that you have to deal with concerning multimedia applications and stateful firewalls: Some multimedia applications embed IP addresses and sometimes port numbers in the payload, which can cause problems with environments that have deployed NAT and/or PAT Some multimedia applications use the same port number for both the source and destination, which makes it more difficult to determine who is initiating a session Some multimedia applications use TCP for connections while others use UDP, or some applications use a combination of protocols for their connections Some multimedia applications use dynamic port numbers for their additional connections, which creates filtering problems since the actual port numbers can come from a very large range of numbers
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As you can see from the preceding list of problems, dealing with multimedia applications in a firewall environment is not an easy task The best solution to use in dealing with multimedia applications is the Cisco application inspection feature for their security appliances The application inspection feature of the appliances will handle the translation of embedded addressing information as well as add entries in the conn table for just the specific connections between the clients and servers no more and no fewer
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Multimedia and Policies
Two main standards are commonly used for multimedia applications: the Real-Time Streaming Protocol (RTSP) and H323 Both standards (especially the latter) define the framework for implementing multimedia applications, which might use voice, video, and or data The problem with both standards is that they don t cover all aspects of what a vendor might want to provide for in an application Therefore, when dealing with the application inspection feature of the appliances, even though a vendor application is using RTSP or H323, that does not mean that Cisco supports it for application inspection Cisco has a list of applications that it officially supports for each protocol; other multimedia applications may or may not work with the appliances, depending on their implementation The following sections will further discuss the two protocols and the application inspection features supported by the appliances TIP For nonsupported applications, you can always use ACL entries, GRE tunnels, or, more preferably, the established command (discussed in 11), to allow this traffic through the appliance
RTSP INSPECTION
Many applications use RTSP to implement the communication infrastructure to transmit information between multimedia devices RTSP is defined in RFC 2326 RTSP is used by many multimedia applications to control the delivery of information, which includes video, audio, as well as data in a real-time fashion It supports both TCP and UDP for control and information streaming processes The security appliance application inspection feature will not work with every multimedia application If you recall from the last section, not every vendor implements these multimedia applications in the same manner Currently Cisco officially supports the following multimedia applications for RTSP: Apple QuickTime Cisco IP/TV RealNetworks RealAudio, RealPlayer, and RealServer
Besides the multimedia applications in the preceding list, other multimedia applications may work, depending on how the vendor implemented them A workaround for those applications not supported by the application inspection feature would be to use ACL entries, GRE tunnels (tunnel the multimedia connections through a single unicast GRE connection), or the established command to open the necessary holes in your appliance to allow connectivity As you will see in the next few sections, the holes that you need to open on the appliance might be very large the advantage of the application inspection feature for supported multimedia applications is that the appliance only opens holes for the connections requested between the communicating devices and maintains these connections in the conn table until they re completed
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