Configuring security Firewall
Digi TransPort® Routers User Guide
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Firewall
Digi TransPort routers have a comprehensive firewall feature. A firewall is a security system for
restricting the type of traffic the router transmits or receives based on a combination of IP address,
service type, protocol type, port number, and IP flags. Firewalls minimize the risk of unauthorized
access to the local network resources by external users or restrict the range of external resources to
which local users have access. For a more detailed description of how firewalls operate on Digi
routers, see Use firewall scripts. Review that topic before attempting to implement a firewall.
The rules governing the operation of the firewall are contained in a pseudo-file called fw.txt. You can
create this file either by using the controls in the Configuration >Security >Firewall page in the
web interface, or by using a text editor on a PC and then loading the resulting file onto the router
using FTP or XMODEM. Digi Routers are shipped with a default fw.txt file you can use as the starting
point for a custom firewall configuration.
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