Lexicon PCM96 SUR-D Руководство по эксплуатации онлайн [32/64] 779817

VirtUal PriVate networks (VPn)

Virtual private networks (VPN) provide an encrypted connection (or tunnel)

between networks or between a network and a user over a public network

(such as the Internet). Instead of using a dedicated, real-world connection

such as a leased line, a VPN uses virtual connections through the public

network. The advantage to a VPN is that your computer can be virtually

connected to a local network even though it is physically anywhere in the

world where you have an internet connection. This can also be done in a safe

manner not compromising your local network’s security. If you would like

to manage your PCM96 Surround units remotely you should create a secure

VPN connection.

There are many solutions on the market today that provide VPN access.

These products offer different features, methods of VPN, complexity of

setup and maintenance, as well as varying levels of security. It is beyond the

scope of this manual to recommend a VPN solution that will best suit the

needs of your network, although you will need a VPN that is capable of

passing UDP and TCP traffic (most do). The PCM96 Surround has been

tested against several solutions and should work with all VPNs that meet

these criteria. Please work with your system administrator and Internet

service provider to find a VPN that will best fit your network. The 3Com

OfficeConnect Secure Router (model # 3CR860-95) is one solution that has

been tested, and is both inexpensive and simple to set up. It provides up to

two concurrent VPN connections.

network Considerations and liMitations

• Without a VPN, there can be no access from the outside world to any

PCM96 Surround that is behind a Network Address Translation (NAT)

router. (One-to-One NAT and port forwarding will not work.)

• Firewall Considerations: The PCM96 Surround uses port 3804 (udp

and tcp) to communicate with the System Architect software. Make sure

that you configure your firewalls correctly so that data sent to and from

this port number can traverse your network.

network troUbleshooting

If you are having difficulty getting your PCM96 Surround to show up in

your System Architect software, here are some things that you can try to

resolve the problem.

software firewall

If the PC that you have installed the System Architect software on has a

built-in firewall you need to make sure that you allow the software the abili-

ty to talk on your network. Try disabling your firewall and then going offline

and back online in the System Architect software. If this fixes the problem,

refer to your firewall manufacturer’s documentation on how to reconfigure

your firewall to allow the System Architect software and/or port 3804 tcp

and udp to pass through the firewall.