Network discovery takes very long time


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  • I have tried to change DNS settings on NEBULA "From ISP" to "static" and entered And turned IPv6 off as ISP apparently do not provide a IPv6 DNS server

    Rebooted router

    DNS1 and 2 still comes from ISP.

    So I'm apparently not allowed to change DNS setting.

    I have attached screendumps
  • I managed to changed it to use google dns ( and as DNS service


    Non-authoritative answer:
    Addresses:  2a02:aa0:28:a000::1007


    Tracing route to []
    over a maximum of 30 hops:

      1     2 ms     1 ms     1 ms
      2     *        *        *     Request timed out.
      3    18 ms    11 ms    10 ms
      4    24 ms    12 ms    10 ms
      5    32 ms    11 ms    11 ms
      6    26 ms    12 ms    12 ms []
      7    35 ms    25 ms    25 ms
      8    29 ms    21 ms    27 ms
      9    35 ms    21 ms    22 ms
     10    26 ms    19 ms    20 ms
     11    27 ms    19 ms    20 ms []

    Trace complete.


  • Just tested the speed.

    Server discovery for speedtest on my phone is less that 1 sec. Download speed > 1Gb
    Server Discovery for speedtest on WiFi6/1.2Gb connection to Nebula > 15 sec. Download speed < 200Mb

    Nebula and phone connected to same 5G cell on same network from same carrier.
    CPU power on phone and Nebula probably comparable.

    There's something blocking the Nebula. Bad antenna? Not likely as that wouldn't delay server discovery but only download speed.

    Any ideas?
  • Zyxel_Bella
    Zyxel_Bella Posts: 380
    25 Answers First Comment Friend Collector Second Anniversary
     Zyxel Employee

    Hi @Bigtroll001


    Noted, thanks for the information.

    The symptom shows the bottleneck is from NR5101 gateway to the internet even settings changed, then we’ll need to collect debug logs on NR5101 to investigate. Could you provide your Org/Site name for us and enable the Zyxel support at Help > Support request > Invite Zyxel support as administrator, save the changes for us to check?

    Thank you





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