Cisco Cisco Firepower Management Center 2000

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FireSIGHT System User Guide
 
Chapter 26      Using Transport & Network Layer Preprocessors 
  Defragmenting IP Packets
You can enable the following rules to generate events for this option:
  –
123:1 through 123:4
  –
123:5 (BSD policy)
  –
123:6 through 123:8
Overlap Limit
Specifies that when the configured number between 0 (unlimited) and 255 of overlapping segments 
in a session has been detected, defragmentation stops for that session. You must enable 
Detect 
Anomalies
 to configure this option. A blank value disables this option.
You can enable rule 123:12 to generate events for this option. See 
for more information.
Minimum Fragment Size
Specifies that when a non-last fragment smaller than the configured number between 0 (unlimited) 
and 255 of bytes has been detected, the packet is considered malicious. You must enable 
Detect 
Anomalies
 to configure this option. A blank value disables this option.
You can enable rule 123:13 to generate events for this option. See 
for more information.
Configuring IP Defragmentation
License: 
Protection
You can use the following procedure to configure the IP defragmentation preprocessor. For more 
information on the IP defragmentation preprocessor configuration options, see 
To configure IP defragmentation:
Access: 
Admin/Intrusion Admin
Step 1
Select 
Policies > Intrusion > Intrusion Policy.
The Intrusion Policy page appears.
Step 2
Click the edit icon (
) next to the policy you want to edit.
If you have unsaved changes in another policy, click 
OK
 to discard those changes and continue. See 
 for information on saving unsaved changes in another 
policy.
The Policy Information page appears.
Step 3
Click 
Advanced Settings
 in the navigation panel on the left.
The Advanced Settings page appears.
Step 4
You have two choices, depending on whether 
IP Defragmentation 
under 
Transport/Network Layer 
Preprocessors
 is enabled:
  •
If the configuration is enabled, click 
Edit
.
  •
If the configuration is disabled, click 
Enabled
, then click 
Edit
.