Polycom ViaVideo manual Opening Ports, Port Number Assignation, Is it Safe?

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Appendix

Network Connection

up a barrier to packet traffic, limiting outside access to your internal network. This is a good thing, but you wouldn’t be reading this if you didn’t want to communicate with the outside world, so there are two solutions: opening ports in the firewall, and setting up a DMZ.

Opening Ports

This solution consists of opening ports in the firewall and assigning these ports to the PC running ViaVideo. This allows ViaVideo to freely accept and receive calls with the outside world, while maintaining protection for your PC and network.

For both router-based and software-only types of firewalls, the procedure is the same, although most router-based firewalls allow you to specifically assign ports to the internal IP address of the PC running VIaVideo, software-only firewalls ask you to assign the ports to an application. Either way, the result is the same - your internal network is protected, and you have video communications access to the outside world.

For information on opening and assigning ports in the firewall, see “Router With Firewall,” on page 66.

Port Number Assignation

ViaVideo has applied with the Internet Assigned Numbers Authority (IANA) for the default range of 6 ports: 3230 - 3235. You must also assign port 1720 to ViaVideo so you can receive incoming calls.

We recommend that you use the default range of ports for both TCP and UDP packet transfer. If you wish to assign a different range of ports, you can specify any registered, non-assigned ports in a 6-port range to ViaVideo. For a list of registered, non-assigned ports, go to: http://www.isi.edu/in-notes/iana/assignments/port-numbers.

When you assign the ports to the ViaVideo application, the router reserves the assigned ports for use by ViaVideo.

Is it Safe?

The short answer is: “Safe enough.” Like any other defense, there’s no such thing as a perfect firewall. Whenever you are connected to the outside world, there is always some risk that someone could gain

© Polycom, Inc.

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ViaVideo User’s Guide

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Contents ViaVideo User’s Guide Page Other Restrictions WarrantyTrademark Information Patent InformationRegulatory Notices FCC Notice Important SafeguardsUnderwriters’ Laboratories’ Statement RADVision StatementContents System Information and Diagnostics Audio ConnectionNetwork Connection Troubleshooting Contents ViaVideo User’s Guide Viii Hardware Requirements System Requirements and InstallationInstalling Software Installing HardwareSoftware Requirements Turn on the Camera Starting ViaVideoViaVideo built-in microphone Initial SetupHeadset with microphone Using Manual Dialing Placing a CallCamera Calibration Info icon Call status light IP address Chapter Using the Address Book or Speed Dialing New entry Edit entry Delete entry On-Screen Remote Control Answering Calls Ending a CallClosing ViaVideo Chapter Calling Features Using ViaVideoHang Up Using the Remote ControlVolume SnapshotAudio Mute Window Controls Information Screen AccessPicture in Picture PIP Minimize WindowSending Snapshots Re-Size the ViaVideo DisplayLeaving a Callback Message Address Book and Speed Dial Using the Address BookDo This Local Entries Local and Global Address Book EntriesGlobal ILS Server Entries Go to the Directory Services screen Register This System When Powered OnDisplay Global Address Using Speed Dial Delete AllLock Controlling Audio Controlling Audio and VideoVia the On-Screen Remote DialVia the Audio Screen Mute Auto Answer Calls in the Audio screen System Muting VideoChapter Multiple IP Addresses Collaboration and Application SharingChapter Using the System Information Screens System Information and DiagnosticsSystem Information and Diagnostics Diagnostics Network Statistics Advanced Statistics Audio JitterVideo Jitter Call Status Reset System Camera Calibration Generate Tone Setup General Auto Start ViaVideo When Auto Start ViaVideo is selected323 Auto AnswerShow Animations Show Half-Size Display When Show Half-Size Display isUser Name MailDirectory Services Register this system when starting ViaVideo LAN and InternetDisplay Global Addresses Default Gateway Wins ResolutionHost Name IP AddressAudio Master Volume Volume ControlWave Volume LineSoftware PC SoftwareViaVideo Software Setup GatekeeperDialing Speeds Display IP Dialing Extension 323Multiple IP Addresses Gatekeeper Dialing Speeds Use Fixed Ports Quality of Service and FirewallsNAT outside WAN address Auto discover NAT IP addressIP Precedence Dynamic BandwidthChapter PC with Speakers Audio ConnectionPC with Headphones Headphones Only Headset with Attached Microphone Simple Connection Just a Modem, Thanks Pick Your Connection TypeRouter With Firewall, Using a DMZ Router With NAT, No FirewallRouter With Firewall Through a Virtual Private Network Configure Your ConnectionConfigure your ViaVideo for NAT When you select Auto discover NAT IP Address, ViaVideoSelect the System is Behind a NAT option System Information screen Open and Assign Ports in the FirewallRouter With Firewall, Using a DMZ Assign your ViaVideo to the DMZ Through a Virtual Private Network Appendix What’s a Firewall? Opening Ports Port Number AssignationIs it Safe? What’s a DMZ? What’s a Network Address Translator? Appendix Problem Explanation Solution General TroubleshootingInfoDiagnosticsGenerate Audio TroubleshootingWave, and Master Volume ControlsWindows Control Panel Video TroubleshootingBandwidth option InfoSetupH.323QOSInstallation Errors Error MessagesErrors Error Message Explanation SolutionSetupH.323 Gatekeeper settingAppendix C