The Cisco IOS Firewall intrusion detection capabilities have
an enhanced reporting mechanism that permits logging to the Cisco Secure IDS
Director console in addition to a Syslog server to provide a consistent view of
all intrusion detection sensors throughout a network. Administrators can deploy
the IOS Firewall IDS to complement their existing IDS systems. This allows IDS
protection to be deployed to areas that might not support a Cisco Secure IDS
Sensor. The IOS Firewall IDS signature features can be deployed alongside or
independent of other Cisco IOS Firewall features.
The Cisco Secure IDS consists of three components:
-
Sensor
-
Director
-
Post Office
Cisco Secure IDS Sensors, dedicated
high-speed network appliances, analyze the content and context of individual
packets to determine if traffic constitutes a threat. If a data stream appears
unauthorized or suspicious, such as a ping sweep or a SATAN attack, the sensors
can detect the policy violation in real-time, forward alarms to a Cisco Secure
IDS Director management console, and remove the offender from the network.
The Cisco Secure IDS Director is a
software-based management system that can monitor the activity of multiple Cisco
Secure IDS Sensors located on local or remote network segments. Events are sent
to the Director by an IDS Sensor or an IDSM that detects a security violation.
The smid daemon on the Director interprets this event
information and passes it to the nrdirmap daemon, which is
responsible for displaying this information on the Director’s maps.
Depending on the severity of an alarm, the alarm icon displays in
different colors: red for severe, yellow for moderate, green otherwise. The Cisco Secure IDS Director is an application that runs on either
HP or Sun Solaris UNIX workstations. The Director is covered in detail in the
final chapter of this book.
The Cisco Secure IDS Post Office Protocol is
the communication backbone that allows Cisco Secure IDS services and hosts to
communicate with each other. All communication is supported by a proprietary,
connection-based protocol that can switch between alternative routes to maintain
point-to-point connections.
|
Note |
Version 2.2.2 of the Cisco Secure IDS
Director replaces the name “Cisco Secure IDS Post Office Protocol” with
“Communication Service.” The version 2.2.2 Installation program replaces the
nr.postofficed daemon. |