title: "srflx" candidate port doesn't match "host " candidate port
body: <p>I'm testing ice servers <a href="https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/" rel="nofollow noreferrer">here</a> from two machines located in different countries. Why do ports match in one case and don't in another? (49824 === 49824, 53371 === 2765)?</p>
  
  <p><strong>Here'a result from one machine:</strong></p>
  
  <pre><code>0.004   1   host    2795255774  udp 192.168.1.7 49824   126 | 32542 | 255
  0.130   1   srflx   264484875   udp 89.105.158.245  49824   100 | 32542 | 255
  0.104   1   host    3894397742  tcp 192.168.1.7 9   90 | 32542 | 255
  </code></pre>
  
  <p><strong>Here'a result from another machine:</strong></p>
  
  <pre><code>0.010   1   host    1019731727  udp 192.168.1.104   53371   126 | 32542 | 255
  0.109   1   srflx   3180321211  udp 178.90.249.178  2765    100 | 32542 | 255
  0.112   1   host    1917068287  tcp 192.168.1.104   9   90 | 32542 | 255
  </code></pre>
  
  <p>Could this be the reason why I can't establish a WebRtc connection between these machines?   </p>