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  • 1.  DNS resolution issues EX3400

    Posted 6 days ago
    Using Juniper EX3400 switches with Mist Wired Assurance.  All of a sudden some of them stopped communicating with the cloud.  It looks like they are not resolving the DNS names.
    Name servers are setup in the switch:
    set groups top system name-server
    set groups top system name-server​

    This command fails.

    show host google.com

    Below passes

    show host server google.com

    Doing a TCPDump shows switch is trying to use instead of the configured name server:

    Reverse lookup for failed (check DNS reachability).
    Other reverse lookup failures will not be reported.
    Use <no-resolve> to avoid reverse lookups on IP addresses.
    17:58:53.074864 Out IP truncated-ip - 21 bytes missing! >  8585+[|domain]

    Running 20.4R3.8.  Any ideas will be greatly appreciated.
    Thank you


  • 2.  RE: DNS resolution issues EX3400

    Posted 6 days ago
    Do you have 'apply-groups top' configured?

  • 3.  RE: DNS resolution issues EX3400

    Posted 5 days ago
    Yup that is there.


  • 4.  RE: DNS resolution issues EX3400

    Posted 5 days ago
    Hi Mohammad,
    I had the similar problem with DNS , I slow this issue when I used template from Mist management see figure. the Mist periodically rewrite local config, maybe this is reason for your problem. 

  • 5.  RE: DNS resolution issues EX3400

    Posted 4 days ago
    Let me double check that.  I don't think that is how we are setting up the name servers.