Chapter 15 Unified Threat Management for FortiOS 5.0 : Custom Application & IPS Signatures : Custom signature keywords : Other keywords
  
Other keywords
data_size
Syntax: --data_size {<size_int> | <<size_int> | ><size_int>};
Description:
Test the packet payload size. With data_size specified, packet reassembly is turned off automatically. So a signature with data_size and only_stream values set is wrong.
<size_int> is a particular packet size.
<<size_int> is a packet smaller than the specified size.
><size_int> is a packet larger than the specified size.
Example: --data_size <300;