Configuring Ip Firewall Filters; Packet Filtering; Basic (Stateless) Packet Filter - Nortel BCM 3.7 Manual

Chapter 41

Configuring IP Firewall Filters

The Business Communications Manager IP Firewall Filters feature is one of the security features
Business Communications Manager offers to protect your network against intruders. The security
and firewall features are also used for controlling what outside resources your users will be able to
access.
The following features are part of the Business Communications Manager firewall:
•

Basic (stateless) Packet Filter

• Stateful Packet Filters
This section also contains information about:
• "Viewing and changing the status of Firewall Filters" on page 820
• "Configuring IP Firewall Filters for an interface" on page 821
• "Accessing Unified Manager through the Firewall" on page 829
Caution: When blocking incoming packets, make sure you do not block your access to
Unified Manager on the system.

Packet filtering

A packet filter is a firewall facility that inspects incoming and outgoing packets and uses this
information to determine which network packets to allow through the firewall. The traffic may or
may not be tracked by keeping the state of the connection.
Basic (stateless) Packet Filter
Business Communications Manager supports basic (or stateless) packet filtering for IP protocols.
Stateless packet filtering examines each packet and determines whether or not to pass it through
based on the rules entered. No state is maintained for packets evaluated using stateless rules.
Basic Packet Filters are configured by setting the Stateful box on the interface screen to No.
("Basic (stateless) Packet Filter" on page
("Stateful Packet Filters" on page
819)
820)
Programming Operations Guide
819