Lectures notes for 2010 - KTH

Silly Window Syndrome
If receiver advertises a small window, then sender will send a small amount of
data, which fills receivers window, … .
To prevent this behavior:
• sender does not transmit unless:
• full-size segment can be sent OR
• it can send at least 1/2 maximum sized window that the other has ever advertised
• we can send everything we have and are not expecting an ACK or Nagle algorithm is
disabled
• receiver must not advertise small segments
• advertise min(a full-size segment, 1/2 the receive buffers space)
• delayed ACKs
Maguire TCP header continued 5: 17 of 77
maguire@kth.se 2010.03.21 Internetworking/Internetteknik