Manual

26
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.