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    DNS not resolving over VPN

    Scheduled Pinned Locked Moved IPsec
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    • M
      msalonius
      last edited by

      Hi All,

      I have a IPSEC site to site VPN

      Site 1: 192.168.1.0/24
      Site 2: 10.10.10.0/24 -> DNS Server 10.10.10.9

      The PC's in Site 1 cannot resolve DNS via the remote DNS Server…I can ping anything from Site 1 to Site 2 and vice versa via their IP addresses but I can't resolve anything.

      Any Ideas?

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      • M
        msalonius
        last edited by

        Any ideas anyone?

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        • M
          MrV0
          last edited by

          Have you setup DNS suffixes in TCP/IP settings on the site 1 systems?
          Please can you show your DHCP scope options.

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          • NogBadTheBadN
            NogBadTheBad
            last edited by

            Tried adding site 1 subnet to the access list ?

            Services -> DNS Resolver -> Access Lists

            https://doc.pfsense.org/index.php/Unbound_DNS_Resolver#Access_Lists_Tab

            Andy

            1 x Netgate SG-4860 - 3 x Linksys LGS308P - 1 x Aruba InstantOn AP22

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            • M
              MrV0
              last edited by

              @NogBadTheBad:

              Tried adding site 1 subnet to the access list ?

              Services -> DNS Resolver -> Access Lists

              https://doc.pfsense.org/index.php/Unbound_DNS_Resolver#Access_Lists_Tab

              Do you have a windows server handling DHCP?

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              • D
                derjuden
                last edited by derjuden

                Since this is basically my same problem.
                I setup a site to site VPN.
                Site 1 is a remote office.
                Site 2 is our DC with our domain controller and DNS servers.
                users at site 1 need to reach systems by DNS at site 2.

                I added a Domain Override to the DNS resolver in the pfsense firewall at site 1 with our domain and the DNS server at site 2 to send the queries to. When I did this the only thing that can be resolved by a DNS is my primary Domain controller. It happens to be a DNS server as well.
                I've tried adding the DNS servers at site 2 to the general setup DNS server list as well after the ISP DNS servers.
                at Site 2 I have a watchguard firewall.
                I looked at this as well https://docs.netgate.com/pfsense/en/latest/vpn/ipsec/access-firewall-over-ipsec.html#ipsec-fwtraffic
                but I don't think this is relates since if I set the DNS server on a local machine to the IP of the DNS server at site 2 I can resolve everything at site 2. I'd like to just do this through the pfsense at site 1.

                I just put my domain DNS server as the primary DNS for the DHCP leases ( Services / DHCP Server / LAN) then google DNS, and then lastly our ISP DNS. Everything works as expected this way.

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