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Appendix Network Connection
© Polycom, Inc. 73 ViaVideo User’s Guide
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
ViaVideoUG.book Page 73 Thursday, December 7, 2000 2:49 PM