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    <div class="moz-cite-prefix">On 09/09/2018 08:27 PM, Champion Xie
      wrote:<br>
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cite="mid:CANsrF0PxYBYGxduK2uXW_ocZ+zYd8S+_9QHMxTbLasC-wa8PVQ@mail.gmail.com">
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            <div>why  use different dig version return different
              result?    Request to reach a different server?</div>
            <br>
            <div><br>
            </div>
            <div><b>./dig xn--j1amh. @<a href="http://212.1.66.247"
                  moz-do-not-send="true">212.1.66.247</a>  +edns=1</b></div>
            <div>;<font color="#33ff33">; BADVERS, retrying with EDNS
                version 0.</font></div>
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    <br>
    You apparently missed the above. Newer BIND steps down the EDNS
    version if a higher version fails, and retries. SERVFAIL is the
    "correct" answer, as nsi.uanic.net is apparently not configured for
    the zone (even though it's in the root delegation for it). <br>
    <br>
    Your earlier version of BIND below gave up on the BADVERS error. <br>
    <br>
    <blockquote type="cite"
cite="mid:CANsrF0PxYBYGxduK2uXW_ocZ+zYd8S+_9QHMxTbLasC-wa8PVQ@mail.gmail.com">
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            <div>; <<>> <b>DiG 9.11.1cn1-P3</b>
              <<>> xn--j1amh. @<a href="http://212.1.66.247"
                moz-do-not-send="true">212.1.66.247</a> +edns=1</div>
            <div>;; global options: +cmd</div>
            <div>;; Got answer:</div>
            <div>;; ->>HEADER<<- opcode: QUERY, status: <b><font
                  color="#ff0000">SERVFAIL</font></b>, id: 41568</div>
            <div>;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0,
              ADDITIONAL: 1</div>
            <div>;; WARNING: recursion requested but not available</div>
            <div><br>
            </div>
            <div>;; OPT PSEUDOSECTION:</div>
            <div>; EDNS: version: 0, flags:; udp: 4096</div>
            <div>;; QUESTION SECTION:</div>
            <div>;xn--j1amh.<span style="white-space:pre">                        </span>IN<span style="white-space:pre">   </span>A</div>
            <div><br>
            </div>
            <div>;; Query time: 3249 msec</div>
            <div>;; SERVER: 212.1.66.247#53(212.1.66.247)</div>
            <div>;; WHEN: Mon Sep 10 11:15:29 CST 2018</div>
            <div>;; MSG SIZE  rcvd: 38</div>
            <div><br>
            </div>
            <div>dig xn--j1amh. @<a href="http://212.1.66.247"
                moz-do-not-send="true">212.1.66.247</a>  +edns=1<br>
            </div>
            <div><br>
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            <div>; <<>><b> DiG
                9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6</b> <<>>
              xn--j1amh. @<a href="http://212.1.66.247"
                moz-do-not-send="true">212.1.66.247</a> +edns=1</div>
            <div>;; global options: +cmd</div>
            <div>;; Got answer:</div>
            <div>;; ->>HEADER<<- opcode: QUERY, status: <b><font
                  color="#ff0000">BADVERS</font></b>, id: 53766</div>
            <div>;; flags: qr rd; QUERY: 0, ANSWER: 0, AUTHORITY: 0,
              ADDITIONAL: 1</div>
            <div>;; WARNING: recursion requested but not available</div>
            <div><br>
            </div>
            <div>;; OPT PSEUDOSECTION:</div>
            <div>; EDNS: version: 0, flags:; udp: 4096</div>
            <div>;; Query time: 819 msec</div>
            <div>;; SERVER: 212.1.66.247#53(212.1.66.247)</div>
            <div>;; WHEN: Mon Sep 10 11:16:08 2018</div>
            <div>;; MSG SIZE  rcvd: 23</div>
            <div><br>
            </div>
            -- <br>
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              <div>Best Regards!!</div>
              <div>champion_xie</div>
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</pre>
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