title: I have some questions about TCP receive window
body: <p>I am currently digging through pcaps, and may have misunderstood some things. Are the following assumptions about the receive window true?</p>
  
  <ul>
  <li><p>RWND is basically the current size of the buffer. It has some max, and the TCP packets contain the current buffer size (MAX - receivedOctets).</p></li>
  <li><p>Assuming the previous is correct, does the MAX buffer size change during communication? Is the MAX buffer size usually constant?</p></li>
  </ul>