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Kushal_52907's avatar
Kushal_52907
Icon for Nimbostratus rankNimbostratus
Nov 19, 2008

How fast does source address persistence work?

Scenario:

 

 

A client host sends 4 simultaneous HTTP requests to an F5 virtual Server with source address persistence enabled. Is there an amount of time it takes for the first session to enable persistence before subsequent sessions can use that persistent rule?

 

 

For instance, what if all 4 client requests show up at the Virtual Server within 1ms of each other. Can we be 100% positive that the first request will establish source adress persistence fast enough such that the subsequent requests will follow the path of the first?
config
design
  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Nov 20, 2008
    Sorry, that wasn't very helpful, was it? The yes is to the second question. The persistence entry will exist before the second request comes in.
  • Kushal_52907's avatar
    Kushal_52907
    Icon for Nimbostratus rankNimbostratus
    Nov 20, 2008
    Not a problem. i was picking up what you're putting down... :-)

     

     

    thanks!

     

     

    /k
  • hoolio's avatar
    hoolio
    Icon for Cirrostratus rankCirrostratus
    Nov 24, 2008
    You could test/prove this using an iRule: 

     
 when CLIENT_ACCEPTED { 
  
    log local0. "[IP::client_addr]:[TCP::local_port]: Persistence record: [persist lookup source_addr [IP::client_addr]]" 
 }

    Aaron