Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

collinz1_17223's avatar
collinz1_17223
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Jan 18, 2011

iRule using findstr in TCP payload

I am trying to create an irule that will search the TCP response from a server for the userData: value and them persist based on that. The irule is below, which i have associated with a Universal per...
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collinz1_17223's avatar
collinz1_17223
Icon for Nimbostratus rankNimbostratus
Jan 19, 2011
It appears that if i reduce the TCP::collect value, i get connected. However i only get connected if i set the value to 19 or below:

 

 

TCP::collect 19

 

 

 

Which is fine as far as connecting goes, however i guess this means that the irule is only collecting 19 bytes of data, which isn't enough to find my search string.