From 0ffaf38602df9e51bd206719f043c3d45fc54043 Mon Sep 17 00:00:00 2001
From: Kulin Shah <m.kulin@gmail.com>
Date: Mon, 25 Feb 2008 14:40:25 -0500
Subject: [PATCH] Fix to make the TCP SYN retransmission do a binary
 exponential backoff

---
 src/internet-node/tcp-socket.cc | 1 +
 src/node/tcp.cc                 | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/internet-node/tcp-socket.cc b/src/internet-node/tcp-socket.cc
index d23e1f1e8..c52eceb98 100644
--- a/src/internet-node/tcp-socket.cc
+++ b/src/internet-node/tcp-socket.cc
@@ -471,6 +471,7 @@ void TcpSocket::SendEmptyPacket (uint8_t flags)
   if (flags & TcpHeader::SYN)
     {
       rto = m_cnTimeout;
+      m_cnTimeout = m_cnTimeout + m_cnTimeout;
       m_cnCount--;
     }
   if (m_retxEvent.IsExpired () ) //no outstanding timer
diff --git a/src/node/tcp.cc b/src/node/tcp.cc
index e6fd6b7e8..55a0927a3 100644
--- a/src/node/tcp.cc
+++ b/src/node/tcp.cc
@@ -54,12 +54,12 @@ NumericDefaultValue<uint32_t>       Tcp::defaultInitialCWnd
 NumericDefaultValue<uint32_t>       Tcp::defaultConnTimeout
 ("TcpDefaultConnTimeout",
 "Default TCP retransmission timeout when opening connection (seconds)",
-6);
+3);
 
 NumericDefaultValue<uint32_t>       Tcp::defaultConnCount
 ("TcpDefaultConnCount",
 "Default number of connection attempts (SYN retransmissions) before returning failure",
-3);
+6);
 
 NS_OBJECT_ENSURE_REGISTERED (Tcp);