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basemsousan1985's avatar
basemsousan1985
Icon for Nimbostratus rankNimbostratus
Dec 16, 2016

How to create costume UDP Monitor

Actually, I am going to create a Virtual Server to loadbalanc traffic against RSA Authintication Manager application which listen on UDP port 1645... I decided to use UDP health monitor, I noticed this knowledge article from F5 that talkign about either adding secondary monitor with UPD monitor or using recive string on the UDP health monitor

 

https://devcentral.f5.com/users/294784/my-messages?view=notifications&action=notifications

 

could you please help me clarifying the send and receive string for UDP monitor??

 

application delivery
LTM

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  • Patrik_Jonsson's avatar
    Patrik_Jonsson
    Icon for MVP rankMVP
    Dec 17, 2016

    Send string = What the LB sends to the application as data. Receive string = What it expects to be in the response (regex, regular expression)

     

  • Patrik_Jonsson's avatar
    Patrik_Jonsson
    Icon for MVP rankMVP
    Dec 18, 2016

    It's actually exactly what it is, although i have no idea why it's there by default.

     

    What happens is that the LB sends an UDP packet with the data "default send string". It's not replaced by anything, just plainly "default send string".

     

    I suppose that as long as you leave your receive string empty the F5 would not care if you get a valid response or not, just as long as you actually get a response.

     

    To know what to replace the send strig and receive string with to get a more accurate monitor you'd have to know the syntax of the application.

     

    /Patrik