Forum Discussion

NoamRotter_1534's avatar
NoamRotter_1534
Icon for Nimbostratus rankNimbostratus
May 04, 2017

Virtual Server going to sleep?

Hi, Many times I cannot access a webapp using the Virtual Server.

 

When pinging the VS IP address and the get "Request timed out." for a while

 

And after a while, the VS starts responding to PING and then, I can access the webapp.

 

 

Why does it happen? why the VS stops responding and after a while it comes back alive?

 

Is the VS going to sleep if it's not in used for a while?

 

 

See the screenshot:

 

 

application delivery
BIG-IP
LTM
security
  • abdul_rahman_63's avatar
    abdul_rahman_63
    Icon for Nimbostratus rankNimbostratus
    May 04, 2017

    Please share the VS config here, no VS will go to sleep, I havenot seen this in my & years experience in F5.

     

  • Stanislas_Piro2's avatar
    Stanislas_Piro2
    Icon for Cumulonimbus rankCumulonimbus
    May 04, 2017

    Hi,

     

    Are you sure there is no duplicate IP?

     

    a VS doesn't stop responding if there in no network issue.

     

  • Stanislas_Piro2's avatar
    Stanislas_Piro2
    Icon for Cumulonimbus rankCumulonimbus
    May 07, 2017

    Hi,

    This is a tcp virtual server. It will. Ever handle icmp requests.

    When you create a virtual server, it automatically create a 

    virtual address
    which manage arp and icmp

  • Prince's avatar
    Prince
    Icon for Altostratus rankAltostratus
    May 07, 2017

    when I ping from my station it does not answer to ping immediately, as seen in the above ping screenshot, but when pinging the VS from BIGIP cli, it answers immediately.

     

    You also have to consider the path between the source PC and F5.

     

    It is not always that you can blame F5 if the application is down.

     

    Have you tried taking a capture at F5 during the issue ? Do you even see that ICMP or your application traffic is reaching the F5 ?

     

  • NoamRotter's avatar
    NoamRotter
    Icon for Altostratus rankAltostratus
    May 08, 2017

    It seems to be a problem in one the router's ARP table size

     

    When pinging from that routing device, I get:

     

     

    Code
connect: No buffer space available

    When I increase the ARP table size, I am able to ping from that routing device

     

    and normally from my PC.

     

    Thank you for directing me to the solution.

     

     

    Regards.