Zyxel RGS200-12P

I got 3 RGS200-12P. How can i permit one ntp serwer to switch and deny all ? i know how to permit ssh, http but i can't find something else like ntp 

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  • Sakura_TSakura_T Member Posts: 21  Freshman Member
    Not quite get your idea.
    For NTP setting: Web interface -> Configuration -> System -> NTP


  • ArturSWArturSW Member Posts: 3
    edited May 7, 2019 1:59PM

    I know where i can setting for NTP. When i permit only one NTP server and deny all i will restrict NTP mode 6 queries.

    Or different question - how can i restrict NTP mode 6 queries in RGS200-12P ? 

    Or how to disable ntp protocol ? when i disable in Web interface -> Configuration -> System -> NTP i still got ntp queries from scanner (nessus) in this switch, 

    I'm preparing my network for security audit - and i got this problem.

  • ArturSWArturSW Member Posts: 3
    Thank you mate for answer. I didn't catch this user guide - thank you !. 

    But... i still got a problem that i don't have clue how to resolve.

    In my network i got some cisco switches, when i create acl for ntp like
    ntp access-group serve-only 1999 (acl number)
    and i permit in this acl my ntp server everything is ok - i don't have an answer from nessus about my ntp server. 

    When i made ACL like you show in post - i still have a answer from nessus about my ntp server - even if it's blocked...

    Got any clue ? i finished my idea's at this moment.
  • Zyxel_LuciousZyxel_Lucious Zyxel Official Agent Posts: 217  mod
    edited May 15, 2019 5:41PM
    Hi @ArturSW

    We've forwarded this vulnerability issue to the internal for analysis and will have a conclusion for you.

    Meanwhile, we locally had some test on our RGS200-12P regarding Nessus NTP Mode 6 Scanner (https://www.tenable.com/plugins/nessus/97861) according to your description.
    But unfortunately we've not seen similar issue in our lab.

    So, if possible, could you provide your test method/procedure as detailed as you can (such as configuration, topology, software version, etc.)?
    It'd be better to have some screenshots as well about Nessus scanner results.

    Thank you for your patience and support.


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