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Kleython_Kell_5's avatar
Kleython_Kell_5
Icon for Nimbostratus rankNimbostratus
Jan 16, 2013

DNS connections

Hello, good morning

 

One question, if someone can help me.

 

 

I have 2 links. I have also created a DNS VS specific for ANY:53 all protocols, with fast layer 4. the method of least connections without persistence.

 

 

Using the command b conn server domain: 53 show all I can see the connections made to this VS, and I see being made normally for the two links.

 

 

When one of the links goes down, or if I give disable one of the links, repeating this command b conn server domain: 53 show all, I can see that some connections are still trapped in that link went down, just a litle, but exist. There is a time for these connections? this is configurable?

 

 

What would be the best outlet to fix it?

 

 

thanks a lot

 

config
design

3 Replies

  • What_Lies_Bene1's avatar
    What_Lies_Bene1
    Icon for Cirrostratus rankCirrostratus
    Jan 16, 2013

    You can adjust the Idle Timeout in a custom FastL4 profile that you can assign to the VS. The default value is 300s. If your DNS traffic is UDP you can drop this to quite a low value I would have thought, however for TCP that might not be so wise.

     

  • hoolio's avatar
    hoolio
    Icon for Cirrostratus rankCirrostratus
    Jan 16, 2013
    You might try a stateless virtual server if it's UDP DNS traffic. See this thread for a good discussion:

     

     

    https://devcentral.f5.com/internal-forums/aft/1168069

     

     

    Aaron