Cisco Cisco IPS 4255 Sensor

ROMMON uses TFTP to download an image and launch it. TFTP does not address network issues such 
as latency or error recovery. It does implement a limited packet integrity check so that packets arriving 
in sequence with the correct integrity value have an extremely low probability of error. But TFTP does 
not offer pipelining so the total transfer time is equal to the number of packets to be transferred times 
the network average RTT. Because of this limitation, we recommend that the TFTP server be located on 
the same LAN segment as the sensor. Any network with an RTT less than a 100 milliseconds should 
provide reliable delivery of the image. Be aware that some TFTP servers limit the maximum file size that 
can be transferred to ~32 MB.

For the procedure for downloading IPS software updates from Cisco.com, see 

. 

For the procedure for configuring automatic updates, for the CLI refer to 

, and for IDM refer to 

Use the following tools for configuring IPS 6.0(6)E4 sensors:

IDM 6.0(2)

IPS CLI 6.0

ASDM 5.2

We recommend that ASDM users upgrade to ASDM 6.3 or later. The Java VM upper 
memory limit of ASDM 6.3 has been increased. Older versions of ASDM may not have 
enough available memory for IDM 6.0(2) to function properly.

CSM 3.2.2 and later

Use the following tools for monitoring 6.0(6)E4 sensors:

MARS 4.2 and 4.3(1)

IEV 5.2

CSM 4.0

Viewers that are already configured to monitor the 5.x sensors may need to be configured to 
accept a new SSL certificate for the 6.0(6)E4 sensors.

For more information about IDM and the Java VM memory requirements, see 

.