User`s guide

Configure Network IP Filtering
Chapter 16 Configuration Menu Interface 247
Configure Network IP Filtering
The Digi Passport unit offers built-in firewall functionality to limit TCP/IP
traffic to and from certain networks, TCP ports, and interfaces. The
functionality implemented is based on the Linux tool IP tables.
The next scenario shows that access to the device connected to the Digi
Passport is allowed only on the .1 subnet. The device at 192.168.1.108 can
access the device connected to the Digi Passport because it is in the range
allowed by the IP Filter rule.
It is also possible to enable or disable specific services of the Digi Passport
unit by creating IP Filtering rules for the following network services:
Network Service Network port number
Telnet console
TCP/IP port 23
SSH console TCP/IP port 22
Web configuration interface TCP/IP port 80
serial
192.168.1.108
Filter IP: 192.168.1.0
Filter Mask: 255.255.255.0
192.168.5.10
192.168.5.10
192.168.1.108