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What_Lies_Bene1's avatar
What_Lies_Bene1
Icon for Cirrostratus rankCirrostratus
Dec 31, 2012

TCP Profile > Zero Window Timeout

Another one for you all. The TCP Profile Zero Window Timeout setting description states "If the Zero Window Timeout timer elapses, the BIG-IP system terminates the connection."   Does this mean a ...
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Gladius_116564's avatar
Gladius_116564
Historic F5 Account
Aug 15, 2014

Yes, If you are talking about "idle timeout". F5 will send reset, if the client and server is not sending any data and keeping idle. That is different from Zero Window timeout.

 

Further more, please be carefull increasing the ZeroWindow timeout, since F5 has to hold the data in the memory. Multiple concurrent open tcp zerowindow connections can fill the F5 buffer.

 

Sorry about tcpdump output, I don't know, how to format text in DevCentral or add you in LinkedIn.

 

Regards, Gladius

 

  • What_Lies_Bene1's avatar
    What_Lies_Bene1
    Icon for Cirrostratus rankCirrostratus
    Aug 15, 2014
    Thanks Gladius, so its your belief that the Reset on Timeout setting only relates to the Idle Timeout, not the Zero Window Timeout. Hence, the sending of a RST on Zero Window timeout cannot be controlled? Yeah, the formatting can be problematic, in your case, paste the text in, select it all and then hit the fourth button from the right in the toolbar, the square with the grey vertical bar on its left and some blue and grey 'text'. http://uk.linkedin.com/in/steveniveson/
  • Gladius_116564's avatar
    Gladius_116564
    Historic F5 Account
    Aug 15, 2014
    Hi Steve, I am sorry, I didn't get your question properly. I didn't test it without "Reset on timeout", I can confirm that F5 sends a reset after zero window timeout with "Reset on timeout". I will try to test without "Reset on timeout" and update you.