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    DNS lookup failing

    DHCP and DNS
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    • J
      jffrysrn222 last edited by

      Hoping someone can help-

      My pfsense install was working and all of a sudden it stopped. I found out that the ISP that I use cycles their two DNS servers, however I have both listed in the general settings. Now I can ping the two server IPs just fine, but when I try to resolve a name it cant(through the webgui and a PC connected to the LAN). I can use the direct IPs and everything is fine, just can't resolve names???

      Can someone help?

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      • stan-qaz
        stan-qaz last edited by

        Might want to just switch to better DNS servers and give up on your ISP's offerings. I use OpenDNS but there are a lot of other good free ones available too.

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        • J
          jffrysrn222 last edited by

          It did not seem to be the actual DNS service as I was able to do the following:

          1. Laptop wired connection to the LAN via the switch
          2. Laptop has static IP on the same segment as the LAN
          3. Able to open a shell and ping LAN interface successfully
          4. Able to ping WAN interface successfully
          5. Able to ping DNS server IP address successfully
          6. Able to ping google's IP address successfully ( i.e. ping 173.194.75.103 )
          7. Unable to ping google using name ( i.e. ping www.google.com )

          Likewise if I open a browser and manually enter 173.184.75.103 I'm taken to google. If I use 'www.google.com' I get the 'can't load page'

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          • W
            wallabybob last edited by

            @jffrysrn222:

            It did not seem to be the actual DNS service as I was able to do the following:

            seems to contradict @jffrysrn222:

            Likewise if I open a browser and manually enter 173.184.75.103 I'm taken to google. If I use 'www.google.com' I get the 'can't load page'

            What is your PC using as its DNS? What do you want it to use? (DNS = Domain Name Service, the service that translates host names to IP addresses.)

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            • stan-qaz
              stan-qaz last edited by

              at results do you get on your client computers if you try running nslookup or dig?

              Here 172.16.0.1 is my pfSense system and my updstream DNS servers are OpenDNS:

              stan@t310:~> nslookup google.com
              Server:         172.16.0.1
              Address:        172.16.0.1#53
              
              Non-authoritative answer:
              Name:   google.com
              Address: 74.125.224.225
              Name:   google.com
              Address: 74.125.224.232
              Name:   google.com
              Address: 74.125.224.229
              Name:   google.com
              Address: 74.125.224.228
              Name:   google.com
              Address: 74.125.224.226
              Name:   google.com
              Address: 74.125.224.224
              Name:   google.com
              Address: 74.125.224.230
              Name:   google.com
              Address: 74.125.224.227
              Name:   google.com
              Address: 74.125.224.233
              Name:   google.com
              Address: 74.125.224.238
              Name:   google.com
              Address: 74.125.224.231
              
              stan@t310:~> dig google.com
              
              ; <<>> DiG 9.9.2-P2 <<>> google.com
              ;; global options: +cmd
              ;; Got answer:
              ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 320
              ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 11, AUTHORITY: 0, ADDITIONAL: 0
              
              ;; QUESTION SECTION:
              ;google.com.                    IN      A
              
              ;; ANSWER SECTION:
              google.com.             277     IN      A       74.125.224.225                                                                                                                  
              google.com.             277     IN      A       74.125.224.231                                                                                                                  
              google.com.             277     IN      A       74.125.224.238                                                                                                                  
              google.com.             277     IN      A       74.125.224.233                                                                                                                  
              google.com.             277     IN      A       74.125.224.227
              google.com.             277     IN      A       74.125.224.230
              google.com.             277     IN      A       74.125.224.224
              google.com.             277     IN      A       74.125.224.226
              google.com.             277     IN      A       74.125.224.228
              google.com.             277     IN      A       74.125.224.229
              google.com.             277     IN      A       74.125.224.232
              
              ;; Query time: 1 msec
              ;; SERVER: 172.16.0.1#53(172.16.0.1)
              ;; WHEN: Mon Jun  3 09:41:19 2013
              ;; MSG SIZE  rcvd: 204
              
              
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