For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

Sandeep_374170's avatar
Sandeep_374170
Icon for Nimbostratus rankNimbostratus
Oct 16, 2018

F5 says application server node down: icmp monitoring fails

Hi,   We are using F5 version BIG-IP 11.6.1 Build 0.0.317 Final. Everything was working fine but suddenly on Friday the application client were not able to connect with application server. When I ...
application delivery
BIG-IP
F5_Learner_3295's avatar
F5_Learner_3295
Icon for Nimbostratus rankNimbostratus
Oct 16, 2018
Hi,

1.After removing the icmp monitoring now application client is able to connect to application server - **Can you confirm which monitor you are using when the icmp was removed.**

2.can you paste the tcpdump command which you used to check the icmp packets.

Regards
  • Sandeep_374170's avatar
    Sandeep_374170
    Icon for Nimbostratus rankNimbostratus
    Oct 16, 2018

    Hi,

     

    Please find my answer inline

     

    1.After removing the icmp monitoring now application client is able to connect to application server - Can you confirm which monitor you are using when the icmp was removed. [Sandeep]: No monitor, the status it shows "Unknown (Enabled) - Node address does not have service checking enabled"

     

    2.can you paste the tcpdump command which you used to check the icmp packets. [Sandeep]: tcpdump -i Service -i Admin host 10.1.130.70 -s 0 -XX For manual ping I can see the traces were captured. I mean from terminal when I execute "ping 10.1.130.70 -I Service"

     

    /Sandeep

     

  • F5_Learner_3295's avatar
    F5_Learner_3295
    Icon for Nimbostratus rankNimbostratus
    Oct 16, 2018

    Hi, what monitor is configured on node ? -Default ??

     

    what monitored is configured on pool ?

     

    Regards

     

  • Sandeep_374170's avatar
    Sandeep_374170
    Icon for Nimbostratus rankNimbostratus
    Oct 16, 2018

    Hi,

     

    what monitor is configured on node ? -Default ??

     

    [Sandeep]: Yes, Node Default

     

    what monitored is configured on pool ?

     

    gateway_icmp