Auto-Zone Control Systems IP Module Kit Installation Guide for the IP Module Kit Used with CommLink IV & 5 (Version 01N) - Manual (Page 16)

IP MODULE
16 Technical Guide
CommLink 5
Firewall / /Proxy Router
Ethernet Cable To Other
Nodes On Building LAN Or WAN
Ethernet Cable
Optional Direct
Computer Connection
To CommLink 5 Via Crossover
(Supplied with IP Module)
Personal Computer
Connecting the Network
Figure 17: 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 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 WatchGuard 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.
Only with proper configuration of the Firewall/Proxy are
connections to the CommLink 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.