Forum Discussion

Jeremy_Bridges_'s avatar
Jeremy_Bridges_
Icon for Nimbostratus rankNimbostratus
Aug 21, 2009

Custom TCP Monitor

I am looking to do some custom TCP monitoring with a custom application that we need to monitor with the F5. Essentially, the application's thread handling logic will hang unless a specific set of se...
management
monitoring
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Aug 25, 2009
Per SOL4186 I don't think you'll be able to use a null in the send or receive string:

 

 

"Note: The BIG-IP system does not allow the ASCII character 0 (NUL)."

 

 

I tried adding this in both \x00 and \x000 format through the GUI, the CLI and the bigip.conf file but all attempts resulted in the 'embedded zero' error.

 

 

You could either check with F5 Support on why this restriction is in place or use an external monitor to send the null. A standard TCP monitor would be simpler and more efficient, so it might be worth checking with F5 on this.

 

 

Aaron