title: How to curl using IPv6 address?
body: <p>I have a VPS with a /64 IPv6 assigned to it.  When I try to curl using one of the IPs in the block, this is the error I get:</p>
  
  <pre><code>curl --interface '2a02:c207:2010:1077::2' http://example.com
  curl: (45) bind failed with errno 99: Cannot assign requested address
  </code></pre>
  
  <p>What exactly do I need to do to fix this?  Shouldn't I be able to use any IP on the machine when logged in as root?</p>
  
  <p>Basically I just need the ability to curl using any IPv6 assigned to the VPS.</p>