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Page 58 - Firewall Configuration The Configuration Tree Functions
Firewall Configuration
A firewall is a means of restricting dialled access to and from a network,
particularly at its interface with the Internet. The IPNC has a firewall with default
settings that allow local users access to the outside world using most TCP/IP
protocols, but stops any unsolicited access from the outside world to your subnet.
When a permitted outgoing session starts it punches a hole in the firewall. This
then allows traffic to flow in both directions. When the session ends the hole is
sealed. A firewall can be specified for both User and Service profiles.
The Standard Firewall Tab
Use the following menu to set up the required firewall profile.
Name: The name of every firewall profile is made available in a drop-down list for
Users and Services.
The Protocol radio buttons: A firewall can be configured to allow individual
protocol sessions access as follows:
Drop: No sessions via selected protocol will be allowed through the
firewall.
In: An incoming session can punch a hole in the firewall to allow traffic
in both directions.
Out: An outgoing session can punch a hole in the firewall to allow traffic
in both directions.
Bothway: Both incoming and outgoing sessions can punch a hole in the
firewall to allow traffic in both directions
The protocols that can be managed in this way are:
File Transfer Protocol (FTP) - a TCP/IP application used for transferring files
from one system to another
Telnet– used for remote access for diagnostic purposes.
Simple Mail Transfer Protocol (SMTP) – an email application.
Page 58 - The Configuration Tree Functions INDeX IPNC Cassette Administration Manual
Firewall Configuration 38DHB0002UKDD – Issue 7 (22/11/02)