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    pfsense DNS Resolver fails to resolve some aws elb domains

    Scheduled Pinned Locked Moved DHCP and DNS
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    • ssbarneaS
      ssbarnea
      last edited by

      I am facing a really weird failure to resolve DNS entries from AWS using pfsense resolver.

      Can someone try:
      internal-OpenPlatformElbInternal-1348256092.us-west-2.elb.amazonaws.com.

      I a use both cloudfare and google DNS servers on both ipv4 and ipv6.

      When I query the dns servers directly they resolve but pfsense persistently refuses to resolve this while resolving others without problems.

      When I use the lookup diagnostic, it always fails:
      Host "internal-OpenPlatformElbInternal-1348256092.us-west-2.elb.amazonaws.com." could not be resolved.

      I am still trying to debug it but even after level3 log level I am still clueless.

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      • ssbarneaS
        ssbarnea
        last edited by

        Found the problem: the aws reply was with private IP addresses and they were dropped by default pfsense setup.

        See https://www.netgate.com/docs/pfsense/dns/dns-rebinding-protections.html for how to enable "Private Address support".

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