Auto-Zone Control Systems CommLink IV Technical Guide, Installation Instructions for the CommLink IV Communications Interface (Version 01E) - Manual (Page 15)

CommLink IV Technical Guide
15 Operator Interface
Connecting the Network
Figure 4: Example Network Diagram of a Firewall or Proxy Confi guration
Proxy and Firewall Compatibility
Proxy and Firewall confi gurations may become necessary
when the CommLink IV is connected to a LAN/WAN that is protected
by a commercially available Firewall, Proxy, or NAT enabled router.
Examples of these would include Cisco, NetGear, LinkSys, or Watch-
Guard Technologies. Also, some ISPs provide IP Address ranges that
are already fi re-walled at the NOC or ISP Head-End. Make sure that
your IT Department or ISP can create a mapped TCP port 39288 on
your fi rewall/proxy to TCP port 39288 on the assigned IP Address of
the CommLink IV.
Only with proper confi guration of the Firewall/Proxy are connections
to the CommLink IV from outside of the local area network going to
be possible. Check that the Firewall/Proxy port is not set to time out
or reset after a specifi ed amount of time when there is no traffi c from
the remote PC.