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

SAP's avatar
SAP
Icon for Nimbostratus rankNimbostratus
Mar 26, 2020

DNS Resolver for System Configuration not working

Hi ,

 

Is there a way to check which name server LTM would consider using which it would create the ephemeral node ? I have 4 configured 2 are reachable and 2 are unreachable. Still LTM is not creating the ephemeral node. Any suggestions would be helpful.

application delivery
LTM

2 Replies

  • Samir's avatar
    Samir
    Icon for MVP rankMVP
    Mar 26, 2020

    Suggestions: If 2 ​ephemeral node is resolving out of 4 mean dns is resolving ip address.

    ​

    Did ​you run the dig command to check right name server?

    ​

    Try below command.​ Example:

    dig example.com +short +identify
dig foo.example.com +all

    ​Let's us know the issue.

    ​

    Thanks​

    • SAP's avatar
      SAP
      Icon for Nimbostratus rankNimbostratus
      Mar 26, 2020

      Hi Samir,

       

      I meant i have 4 name servers configured. But ephimeral node still doesn't populate.

       

      Out of 4 two name servers are reachable from device and 2 are not reachable. Ideally it should populate the ephimeral node but issue here is it doesn't.

       

      Thanks