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san2hosh_306591's avatar
san2hosh_306591
Icon for Nimbostratus rankNimbostratus
Jul 14, 2017

Question on TCP and FastL4 idle timeouts.

We are using the TCP idle timeout as 3600 secs for most of our Virtual servers and recently we started using the Fast L4 for some new virtual servers with a timeout as 7200 secs. But we are in a dilemma that do we face any kind of performance issues on F5 or does that impact something? Appreciated if someone explains briefly about the impact and shows us some good path to use them.

 

application delivery
BIG-IP
LTM

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  • Leonardo_Souza's avatar
    Leonardo_Souza
    Icon for Cirrocumulus rankCirrocumulus
    Jul 14, 2017

    The timeout in the TCP or fast L4 should have the same impact. Having 1 hour or 2 hours is not a good approach.

     

    The side effect of that can be:

     

    F5 - High memory, every open connection needs memory allocated. If you reach 85% you start to see an impact.

     

    Server - Similar problem, as F5 keeps the pool member connection up.

     

    This solution explains the memory problem:

     

    https://support.f5.com/csp/article/K15740