title: Can't delete docker container's default iptables rule
body: <p>If I type <code>iptables -L</code> there is this line in the output  :</p>
  
  <pre><code>Chain DOCKER (1 references)
  target     prot opt source               destination         
  ACCEPT     tcp  --  anywhere             172.17.0.2           tcp dpt:http-alt
  </code></pre>
  
  <p>My container is exposed publicly and I can request a dummy http server from everywhere (tested). I try to remove that rule so only 80 is only exposed inside my server (<code>localhost:80</code>). I tried :</p>
  
  <pre><code>root@ns25252:~# iptables -D DOCKER  --destination 172.17.0.2 -p tcp --dport 80 -j ACCEPT
  iptables: Bad rule (does a matching rule exist in that chain?).
  </code></pre>
  
  <p>As the error implies, it can't find the matching rule.. How should I type to remove the line ?</p>