User`s guide

Configuration through the web interface
167
Use IP filtering
You can better restrict your device on the network by only allowing certain devices or networks to
connect. This is known as IP filtering or Access Control Lists (ACL). IP filtering configures a Digi
device to accept connections from specific and known IP addresses or networks only, and silently
drop other connections. Digi devices can be filtered on a single IP address or restricted as a group
of devices using a subnet mask that only allows specific networks to access to the device. IP
Filtering settings are a part of the Network configuration settings. See "IP filtering settings" on
page 75.
Important: Plan and review your IP filtering settings before applying them. Incorrect settings can
make the Digi device inaccessible from the network.
Use Network Port Scan Cloaking feature
The Network Port Scan Cloaking feature allows you to configure this Digi device to ignore
(discard) received packets for services that are hidden or not enabled and network ports that are not
open. This feature can be used to protect your Digi device from malicious software or denial of
service attacks. For more information, see "Network Port Scan Cloaking" on page 101.