dns randomcase requests causing bypass dns cache

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    • Type: Incident report
    • Resolution: Duplicate
    • Priority: Trivial
    • None
    • Affects Version/s: 7.0.8
    • Component/s: Proxy (P)
    • None
    • Environment:
      Debian 12 / Zabbix-Proxy 7.08

      Steps to reproduce:

      1. Configure host with an interface using FQDN instead of IP
      2. Observe dns queries with tcpdump/wireshark

      We are wondering why our zabbix-proxy generates over 1000 dns requests per second. On the server we run dns caching daemon, but the zabbix-proxy sends requests with random cased names. For example: when you configure the host with the interface hostname.subdomain.tld, you will see many requests (A/AAAA) for  HOStNamE.sUbDOMAiN.Tld, HosTName.SUBdOmAIn.tLd, HOStname.sUbdoMAiN.TLd, etc.... For the caching daemon it looks different and all requests are send to our resolver. Is there a way to change this behavior? 

            Assignee:
            Unassigned
            Reporter:
            Vladimir Holzmann
            Votes:
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            Watchers:
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              Created:
              Updated:
              Resolved: