DNS not working for private IPs


  • The router seems to be preventing DNS resolution to private IP addresses.

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    When I send the DNS request to the router, I get no answer:

    dig @10.0.1.1 10.0.1.2.xip.io
    
    ; <<>> DiG 9.8.3-P1 <<>> @10.0.1.1 10.0.1.2.xip.io
    ; (1 server found)
    ;; global options: +cmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15532
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
    
    ;; QUESTION SECTION:
    ;10.0.1.2.xip.io.               IN      A
    
    ;; Query time: 70 msec
    ;; SERVER: 10.0.1.1#53(10.0.1.1)
    ;; WHEN: Mon May 14 19:59:29 2018
    ;; MSG SIZE  rcvd: 33
    

    When I send the request directly to the DNS server that the router is configured to forward DNS requests to, it works:

    dig @68.105.28.11 10.0.1.2.xip.io
    
    ; <<>> DiG 9.8.3-P1 <<>> @68.105.28.11 10.0.1.2.xip.io
    ; (1 server found)
    ;; global options: +cmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57198
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
    
    ;; QUESTION SECTION:
    ;10.0.1.2.xip.io.               IN      A
    
    ;; ANSWER SECTION:
    10.0.1.2.xip.io.        300     IN      A  10.0.1.2
    
    ;; Query time: 70 msec
    ;; SERVER: 68.105.28.11#53(68.105.28.11)
    ;; WHEN: Mon May 14 20:14:46 2018
    ;; MSG SIZE  rcvd: 49
    

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