[USG Flex H - V1.39(ABZH.0)ITS-260800686] - User Custom DDNS effective IP not appear

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  • Zyxel_Luna
    Zyxel_Luna Posts: 46 image  Zyxel Employee
    5 Answers First Comment Friend Collector
    edited August 25
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    Hi @Maverick87 ,

    Under the [Public IP] setting in the [User Custom] type, the ZyWALL queries a third-party URL to obtain its current public IP address, then sends an update request to the DDNS server, and writes the Public IP to the Effective IP field based on the server's successful response.
    Given the uniqueness of Dynu DDNS, we provide dedicated Dynu DDNS service types [Dynu Basic / Premium] to choose from.

    When using the dedicated [Dynu Basic] types, clicking the Update button should properly display the Effective IP.

    Thank you for your support of Zyxel.

  • Maverick87
    Maverick87 Posts: 330 image  Master Member
    Zyxel Certified Network Administrator - WLAN Zyxel Certified Network Administrator - Nebula Zyxel Certified Network Administrator - Security Zyxel Certified Sales Associate
    edited August 24
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    Hi @Zyxel_Luna,

    OK but my IP change every day (every night I power off my network, and every morning I power on all the network devices, and in this way my external WAN IP change). The WAN IP change, arrive to Dynu, that change correctly the IPv4, but seems that in the Effective IP return always "blank"

    image.png image.png

    As you can see the IP was updated today at 08:35AM GMT+2, but the Effective IP is empty.

    Thank you

  • PeterUK
    PeterUK Posts: 4,679 image  Guru Member
    250 Answers 2500 Comments Friend Collector Eighth Anniversary
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    hmm so your sure your IP changes? so the FLEX H is also powered off at night to be turn on?

    maybe to night as a test note down your IP have only user custom enabled and turn off then check your Effective IP.

  • Maverick87
    Maverick87 Posts: 330 image  Master Member
    Zyxel Certified Network Administrator - WLAN Zyxel Certified Network Administrator - Nebula Zyxel Certified Network Administrator - Security Zyxel Certified Sales Associate
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    Hi Peter,

    I've tried to refresh my IP from the WAN interface (click on "disconnect"); my external IP changed and now I see the effective IP.

    image.png

    In a little while, I try to reboot the 500H and try to see if the IP change and also the effective IP.

    I'm still 1000% sure that every time I reboot (or turnoff-turnon the network) the WAN PPPoE take a different IP.

  • Maverick87
    Maverick87 Posts: 330 image  Master Member
    Zyxel Certified Network Administrator - WLAN Zyxel Certified Network Administrator - Nebula Zyxel Certified Network Administrator - Security Zyxel Certified Sales Associate
    edited August 24
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    Yes, confirm.
    After a reboot, the IP changed one more time, and in the Effective IP is one more time empty

    image.png image.png

    Thank you

  • PeterUK
    PeterUK Posts: 4,679 image  Guru Member
    250 Answers 2500 Comments Friend Collector Eighth Anniversary
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    There is a time difference FLEX shows 2006-08-24 12:38:28 were Dynu show 2026/08/24 12:36:15 it would seem the FLEX might of checked again and got back the nochg clearing the Effective IP.

  • Maverick87
    Maverick87 Posts: 330 image  Master Member
    Zyxel Certified Network Administrator - WLAN Zyxel Certified Network Administrator - Nebula Zyxel Certified Network Administrator - Security Zyxel Certified Sales Associate
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    Can be this the problem :)

  • PeterUK
    PeterUK Posts: 4,679 image  Guru Member
    250 Answers 2500 Comments Friend Collector Eighth Anniversary
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    Well if we go back to what I posted

    [USG Flex H - V1.39(ABZH.0)ITS-260800686] - User Custom DDNS effective IP not appear - Page 2 — Zyxel Community

    If Dynu only did on update

    good 92.239.74.95

    and not 

    nochg

    Then there should be no problem and like really why sent nochg vs good 92.239.74.95 to save some bytes? or Zyxel can just ignore the nochg to not make the Effective IP go blank.

    that what I think the problem is not 100% but I do know it causes no problem

  • Maverick87
    Maverick87 Posts: 330 image  Master Member
    Zyxel Certified Network Administrator - WLAN Zyxel Certified Network Administrator - Nebula Zyxel Certified Network Administrator - Security Zyxel Certified Sales Associate
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    Yes, obviously no problem, it's only a visualisation "bug"...

  • PeterUK
    PeterUK Posts: 4,679 image  Guru Member
    250 Answers 2500 Comments Friend Collector Eighth Anniversary
    edited August 24
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    Its a bit more then a visualisation "bug" its a case of who is right or are they both right or are the both wrong.

    If you was to ask Contact Us | Dynu to not do on update for DDNS nochg and always do good IP there be not problem I'm sure

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