Nortel BCM 3.7, Manual

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Programming Operations Guide
Chapter 34
Configuring Web Cache
When you use Business Communications Manager as a web proxy, Business Communications
Manager can store, or cache, information downloaded from the Internet. A proxy is a server that
acts on behalf of another. Web caching allows LAN workstations to share common information
downloaded from the Internet.
The Web Cache on the Business Communications Manager supports the LAN, WAN, and
DIALUP interfaces.
With Business Communications Manager configured as a web proxy with web caching:
• LAN workstations have shorter download times.
• The system stores previously downloaded information for future use by all workstations on the
LAN.
• Business Communications Manager retrieves information from the Internet only if it is not
already cached or if the cached file is out of date compared to the information on the Internet.
To use the Web Cache on the Business Communications Manager, you must configure the client
computer to use an Internet Proxy at port 6800, where the internet proxy is the Business
Communications Manager.
The web proxy also provides security features similar to the DNS proxy. It hides all of the internal
browsers’ IP addresses from external web servers. External web servers see only the Business
Communications Manager IP address.
Guidelines for using Web caching/Proxy
The Business Communications Manager web proxy uses a web server for running in HTTP-Proxy
mode.
!
Security Note:
When Web Cache is enabled, the proxy service is also enabled on all of
the network interfaces. If your Business Communications Manager is connected to an
external interface, it is possible for someone on the external network to use the proxy
service to access one of the internal networks.
To block the proxy service on any of the network interfaces, select the check box beside
the interface you want to block in the
Proxy Blocked Interfaces field.
The default for the Proxy Blocked Interfaces field is selected (blocked) for the LAN1
interface.
When Web Cache is disabled, the proxy service is also disabled on all the network
interfaces
Refer to “Important Web Cache considerations” on page 725 for more details.