Service Filter; Schedule; Intrusion Detection / Prevention - D-Link DFL-200 - Security Appliance User Manual

Source Users/Groups – Specifies if an authenticated username is needed for this policy
to match. Simply make a list of usernames separated by commas (,), specify an entire user
group, or write Any to indicate all authenticated users to enable authentication on this policy.
If it is left blank there is no need for authentication for the policy.
Destination Nets – Specifies the span of IP addresses to be compared to the destination
IP of the received packet. Leave this blank to match everything.
Destination Users/Groups – Specifies if an authenticated username is needed for this
policy to match. Either make a list of usernames, separated by a comma (,) or write Any for
any authenticated user. If it is left blank there is no need for authentication for the policy.

Service Filter

Either choose a predefined service from the dropdown menu or make a custom service.
The following custom services exist:
All – Matches all protocols.
TCP+UDP+ICMP – This service matches all ports on either the TCP or the UDP protocol,
including ICMP.
Custom TCP – This service is based on the TCP protocol.
Custom UDP – This service is based on the UDP protocol.
Custom TCP+UDP – This service uses both the TCP and UDP protocols.
The following is used when making a custom service:
Custom source/destination ports – For many services, a single destination port is
sufficient. The source port used most often are all ports, 0-65535. The http service, for
instance, uses destination port 80. A port range can also be used, meaning that a range 137-
139 covers ports 137, 138, and 139. Multiple ranges or individual ports may also be entered,
separated by commas. For instance, a service can be defined as having source ports 1024-
65535 and destination ports 80-82, 90-92, and 95. In this case, a TCP or UDP packet with the
destination port being one of 80, 81, 82, 90, 91, 92 or 95, and the source port being in the
range 1024-65535, will match this service.

Schedule

If a schedule should be used for the policy, choose one from the dropdown menu. These
are specified on the Schedules page. If the policy should always be active, choose Always
from the dropdown menu.

Intrusion Detection / Prevention

The DFL-200 Intrusion Detection/Prevention System (IDS/IDP) is a real-time intrusion
detection and prevention sensor that identifies and takes action against a wide variety of
suspicious network activity. The IDS uses intrusion signatures, stored in the attack database,
to identify the most common attacks. In response to an attack, the IDS will protect the
networks behind the DFL-200 by dropping the traffic. To notify responsible parties of the
malicious attack, the IDS will send e-mails to the system administrators if e-mail alerting is
enabled and configured. D-Link updates the attack database periodically. There are two
modes that can be configured, either Inspection Only or Prevention. Inspection Only will