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Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.1
OL-24002-01
Chapter 3 Installing the IPS 4240 and IPS 4255
Product Overview
Note
The illustrations in this chapter show the Cisco IPS 4240 appliance sensor. The IPS 4240 and the
IPS 4255 look identical with the same front and back panel features and indicators.
Note
In IPS 7.1, rx/tx flow control is disabled on the IPS 4240 and the IPS 4255. This is a change from IPS
7.0 where rx/tx flow control is enabled by default.
Caution
The BIOS on IPS 4240 and the IPS 4255 is specific to IPS 4240 and the IPS 4255 and must only be
upgraded under instructions from Cisco with BIOS files obtained from the Cisco website. Installing a
non-Cisco or third-party BIOS on these sensors voids the warranty. For more information on how to
obtain instructions and BIOS files from the Cisco website, see Obtaining Cisco IPS Software, page C-1.
Product Overview
The IPS 4240 and IPS 4255 deliver high port density in a small form factor. They use a compact flash
device for storage rather than the hard-disk drives used in other sensor models.
Note
The IPS 4240 and the IPS 4255 do not support redundant power supplies.
The IPS 4240 replaces the IDS 4235. There are four 10/100/1000 copper sensing interfaces. The
IPS 4240 is available with either AC or DC power. It monitors up to 250 Mbps of aggregate network
traffic on multiple sensing interfaces and is inline ready. The 250-Mbps performance for IPS 4240 is
based on the following conditions:
•
2500 new TCP connections per second
•
2500 HTTP transactions per second
•
Average packet size of 445 bytes
•
Running Cisco IPS 5.1 or later
Note
The 250-Mbps performance is traffic combined from all four sensing interfaces.
The IPS 4255 replaces the IDS 4250-TX. There are four 10/100/1000 copper sensing interfaces. It
monitors up to 600 Mbps of aggregate network traffic on multiple sensing interfaces and is also inline
ready. The 600-Mbps performance for the IPS 4255 is based on the following conditions:
•
6000 new TCP connections per second
•
6000 HTTP transactions per second
•
Average packet size of 445 bytes
•
Running Cisco IPS 5.1 or later
Note
The 600-Mbps performance is traffic combined from all four sensing interfaces.