# HG changeset patch
# User Brian Swenson <bswenson3@gatech.edu>
# Date 1348150408 14400
# Node ID 11ac313c0610f9bc9ce0232b39b0e43b32800a3b
# Parent  16e6f501eeefa4c2d601739433f582a78deeca50
bug 1506 dup ack piggyback fix

diff -r 16e6f501eeef -r 11ac313c0610 src/internet/model/tcp-socket-base.cc
--- a/src/internet/model/tcp-socket-base.cc	Fri Sep 14 22:07:40 2012 +0200
+++ b/src/internet/model/tcp-socket-base.cc	Thu Sep 20 10:13:28 2012 -0400
@@ -1028,7 +1028,7 @@
     }
   else if (tcpHeader.GetAckNumber () == m_txBuffer.HeadSequence ())
     { // Case 2: Potentially a duplicated ACK
-      if (tcpHeader.GetAckNumber () < m_nextTxSequence)
+      if (tcpHeader.GetAckNumber () < m_nextTxSequence && packet->GetSize() == 0)
         {
           NS_LOG_LOGIC ("Dupack of " << tcpHeader.GetAckNumber ());
           DupAck (tcpHeader, ++m_dupAckCount);