title: I want to query EDNS with Bind, what's edns-disabled?
body: <p>I start Bind in 9.11.2. I want to query some site with EDNS, but I got this problem. How should i do?</p>
  
  <pre><code>13-Nov-2017 08:05:34.970 dnssec: debug 4: validator @0x7f44897f0f20: dns_validator_destroy
  13-Nov-2017 08:05:34.970 edns-disabled: info: success resolving 'www.gds.alibaba.com/A' (in 'gds.alibaba.com'?) after disabling EDNS
  13-Nov-2017 08:05:34.970 database: debug 5: dns_adb_destroyfind on find 0x7f4484bd9e20
  13-Nov-2017 08:05:34.970 database: debug 5: dns_adb_destroyfind on find 0x7f4484bcae20
  13-Nov-2017 08:05:34.970 client: debug 3: client @0x7f44897c7480 
  </code></pre>
  
  <p>I turn on the log at level 5(<code>rndc trace 5</code>). I'm confused, how?</p>
  
  <pre><code>13-Nov-2017 08:05:34.970 edns-disabled: info: success resolving 'www.gds.alibaba.com/A' (in 'gds.alibaba.com'?) after disabling EDNS
  </code></pre>
  
  <p>What's edns-disabled？</p>