Configuring The System For Use With A Firewall Or Nat - Polycom ViewStation EX Administrator's Manual

Configuring the System for Use with a Firewall or NAT

© Polycom, Inc.
A firewall protects an organization's network by controlling data traffic from
outside the network. Unless your firewall is designed to work with H.323
videoconferencing equipment, you must configure the system and the firewall to
allow videoconferencing traffic to pass in and out of the network.
Network Address Translation (NAT) network environments use private internal IP
addresses for devices within the network, while using one external IP address to
allow devices on the LAN to communicate with other devices outside the LAN. If
your system uses a NAT, it must be assigned a public IP address to communicate
outside the LAN.
Systems deployed outside a firewall are potentially vulnerable to unauthorized access. Visit
the Polycom Security Center at
also register to receive periodic email updates and advisories.
To set up the system to work with a firewall or NAT:
1. Go to System Info > Admin Setup > LAN/H.323 > LAN/Intranet >
Firewall/LAN Connection.
2. Configure these settings:
Setting
Use Fixed Ports
TCP Ports
UDP Ports
System is Behind a
NAT
NAT is H.323
Compatible
Auto Discover NAT
www.polycom.com
Description
Lets you specify whether to define the TCP and UDP ports.
This enables the ViewStation system to assign a range of ports
starting with the TCP and UDP ports you specify. In most cases,
the range begins with port 3230 for both TCP and UDP.
Note: You must also open the firewall's TCP port 1720 to allow
H.323 traffic.
Lets you specify the beginning value for the range of TCP and
UDP Ports used by the system.
Note: You must also open the firewall's TCP port 1720 to allow
H.323 traffic.
Lets you specify that the system obtains its IP address from the
NAT. If users connect to this system using a Virtual Private
Network (VPN), clear this field.
Lets you specify that the system is behind a NAT that allows
HTTP traffic.
Lets you specify whether the system should determine the NAT
Public Address automatically.
The system restarts if you change this setting.
Chapter 3 - Configuring Network Use
for timely security information. You can
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