extra empty data packet

Hello,

 

 

I used the IRULE below, for replacing the first 4 bytes of data packet with the $exe+123456789012345678901234567890 data. It works fine except it sends 40+30 (data packet is 30 bytes)

 

bytes empty data packet. After this first empty data packet, it works fine and sends

 

$exe+123456789012345678901234567890 as expected.

 

What can be the reason of this?

 

Thanks a lot

 

 

when CLIENT_ACCEPTED {

 

TCP::collect

 

}

 

when CLIENT_DATA {

 

set exe [TCP::payload 4]

 

set data 123456789012345678901234567890

 

set data "$exe$data"

 

TCP::payload replace 0 4 $data

 

TCP::release

 

}