{"id":30,"date":"2007-05-07T12:19:37","date_gmt":"2007-05-07T11:19:37","guid":{"rendered":"http:\/\/www.servernet.dk\/?p=30"},"modified":"2007-05-07T12:19:37","modified_gmt":"2007-05-07T11:19:37","slug":"how-to-quickly-test-dns-resolution","status":"publish","type":"post","link":"http:\/\/www.servernet.dk\/?p=30","title":{"rendered":"How to ”Quickly” Test DNS Resolution"},"content":{"rendered":"
    \n
  1. You have to see if DNS resolution is working you can see if the DNS server you are configured to query knows what it?s talking about. Using the NSLOOKUP command shows this information.<\/li>\n<\/ol>\n\n\n
    C:\\WINDOWS\\SYSTEM32>nslookup
    \n<\/strong>Default Server:? ns3.srv.hcvlny.cv.net
    \nAddress:? 167.206.112.3<\/p>\n

    > www.yahoo.com<\/a>
    \nServer:? ns3.srv.hcvlny.cv.net
    \nAddress:? 167.206.112.3<\/p>\n

    Non-authoritative answer:
    \nName:? ? ?     www.yahoo.akadns.net<\/a>
    \nAddresses:? 216.109.118.74, 216.109.118.75, 216.109.118.77, 216.109.117.110
    \n? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 216.109.117.204, 216.109.117.205, 216.109.118.69, 216.109.118.71
    \nAliases:?     www.yahoo.com<\/u><\/a><\/td>\n<\/tr>\n<\/table>\n

      \n
    1. When I query my local DNS server, I can see that Yahoo.com has multiple IP addresses that can be used.<\/li>\n
    2. Now, it?s possible to ping with the ?a switch to also verify if DNS resolution is work. Pinging Yahoo?s IP address with the ?a switch produces the DNS name of the system.<\/li>\n<\/ol>\n\n\n
      C:\\WINDOWS\\SYSTEM32>ping -a<\/strong> 216.109.118.74<\/p>\n

      Pinging p11.www.dcn.yahoo.com<\/strong> [216.109.118.74] with 32 bytes of data:<\/p>\n

      Reply from 216.109.118.74: bytes=32 time=22ms TTL=51
      \nReply from 216.109.118.74: bytes=32 time=25ms TTL=51
      \nReply from 216.109.118.74: bytes=32 time=27ms TTL=51
      \nReply from 216.109.118.74: bytes=32 time=32ms TTL=51<\/p>\n

      Ping statistics for 216.109.118.74:
      \n? ? ? Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
      \nApproximate round trip times in milli-seconds:
      \n? ? ? Minimum = 22ms, Maximum = 32ms, Average = 26ms<\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

      You have to see if DNS resolution is working you can see if the DNS server you are configured to query knows what it?s talking about. Using the NSLOOKUP command shows this information. C:\\WINDOWS\\SYSTEM32>nslookup Default Server:? ns3.srv.hcvlny.cv.net Address:? 167.206.112.3 > www.yahoo.com Server:? ns3.srv.hcvlny.cv.net Address:? 167.206.112.3 Non-authoritative answer: Name:? ? ? www.yahoo.akadns.net Addresses:? 216.109.118.74, 216.109.118.75, 216.109.118.77, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-30","post","type-post","status-publish","format-standard","hentry","category-diverse"],"_links":{"self":[{"href":"http:\/\/www.servernet.dk\/index.php?rest_route=\/wp\/v2\/posts\/30","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.servernet.dk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.servernet.dk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.servernet.dk\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.servernet.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=30"}],"version-history":[{"count":0,"href":"http:\/\/www.servernet.dk\/index.php?rest_route=\/wp\/v2\/posts\/30\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.servernet.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=30"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.servernet.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=30"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.servernet.dk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=30"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}