diff --git a/libraries/networking/src/LimitedNodeList.cpp b/libraries/networking/src/LimitedNodeList.cpp
index fc8e6ad8fe..2ca4e89c12 100644
--- a/libraries/networking/src/LimitedNodeList.cpp
+++ b/libraries/networking/src/LimitedNodeList.cpp
@@ -33,8 +33,6 @@
 #include "UUID.h"
 #include "NetworkLogging.h"
 
-#include "udt/udt.h"
-
 const char SOLO_NODE_TYPES[2] = {
     NodeType::AvatarMixer,
     NodeType::AudioMixer
@@ -81,9 +79,6 @@ LimitedNodeList::LimitedNodeList(unsigned short socketListenPort, unsigned short
         qCDebug(networking) << "NodeList DTLS socket is listening on" << _dtlsSocket->localPort();
     }
 
-    const int LARGER_BUFFER_SIZE = 1048576;
-    _nodeSocket.setBufferSizes(LARGER_BUFFER_SIZE);
-
     // check for local socket updates every so often
     const int LOCAL_SOCKET_UPDATE_INTERVAL_MSECS = 5 * 1000;
     QTimer* localSocketUpdate = new QTimer(this);
diff --git a/libraries/networking/src/udt/BasePacket.h b/libraries/networking/src/udt/BasePacket.h
index d943e05204..8dcc3ab9be 100644
--- a/libraries/networking/src/udt/BasePacket.h
+++ b/libraries/networking/src/udt/BasePacket.h
@@ -17,11 +17,10 @@
 #include <QtCore/QIODevice>
 
 #include "../HifiSockAddr.h"
+#include "Constants.h"
 
 namespace udt {
     
-static const int MAX_PACKET_SIZE = 1450;
-    
 class BasePacket : public QIODevice {
     Q_OBJECT
 public:
diff --git a/libraries/networking/src/udt/CongestionControl.cpp b/libraries/networking/src/udt/CongestionControl.cpp
index 14d88a4761..1450e60930 100644
--- a/libraries/networking/src/udt/CongestionControl.cpp
+++ b/libraries/networking/src/udt/CongestionControl.cpp
@@ -10,6 +10,7 @@
 //
 
 #include "CongestionControl.h"
+#include "Packet.h"
 
 using namespace udt;
 using namespace std::chrono;
@@ -19,6 +20,8 @@ static const double USECS_PER_SECOND = 1000000.0;
 void DefaultCC::init() {
     _lastRCTime = high_resolution_clock::now();
     
+    _mss = udt::MAX_PACKET_SIZE_WITH_UDP_HEADER;
+    
     _slowStartLastAck = _sendCurrSeqNum;
     _lastDecreaseMaxSeq = SequenceNumber { SequenceNumber::MAX };
     
diff --git a/libraries/networking/src/udt/Connection.cpp b/libraries/networking/src/udt/Connection.cpp
index bce650b85a..de675bfca8 100644
--- a/libraries/networking/src/udt/Connection.cpp
+++ b/libraries/networking/src/udt/Connection.cpp
@@ -30,6 +30,10 @@ Connection::Connection(Socket* parentSocket, HifiSockAddr destination, unique_pt
     _destination(destination),
     _congestionControl(move(congestionControl))
 {
+    // setup default SYN, RTT and RTT Variance based on the SYN interval in CongestionControl object
+    _synInterval = _congestionControl->synInterval();
+    _rtt = _synInterval * 10;
+    _rttVariance = _rtt / 2;
 }
 
 Connection::~Connection() {
@@ -114,7 +118,9 @@ void Connection::sendACK(bool wasCausedBySyncTimeout) {
     // pack in the RTT and variance
     ackPacket->writePrimitive(_rtt);
     
-    // pack the available buffer size - must be a minimum of 2
+    // pack the available buffer size, in packets
+    // in our implementation we have no hard limit on receive buffer size, send the default value
+    ackPacket->writePrimitive((int32_t) udt::CONNECTION_RECEIVE_BUFFER_SIZE_PACKETS);
     
     if (wasCausedBySyncTimeout) {
         // pack in the receive speed and estimatedBandwidth
diff --git a/libraries/networking/src/udt/Connection.h b/libraries/networking/src/udt/Connection.h
index c5ff009fc9..2af89000e6 100644
--- a/libraries/networking/src/udt/Connection.h
+++ b/libraries/networking/src/udt/Connection.h
@@ -16,6 +16,7 @@
 #include <memory>
 
 #include "ConnectionStats.h"
+#include "Constants.h"
 #include "LossList.h"
 #include "PacketTimeWindow.h"
 #include "SendQueue.h"
@@ -65,7 +66,7 @@ private:
     
     int estimatedTimeout() const;
     
-    int _synInterval; // Periodical Rate Control Interval, in microseconds, defaults to 10ms
+    int _synInterval; // Periodical Rate Control Interval, in microseconds
     
     int _nakInterval; // NAK timeout interval, in microseconds
     int _minNAKInterval { 100000 }; // NAK timeout interval lower bound, default of 100ms
@@ -83,7 +84,7 @@ private:
     
     int32_t _rtt; // RTT, in microseconds
     int32_t _rttVariance; // RTT variance
-    int _flowWindowSize; // Flow control window size
+    int _flowWindowSize { udt::MAX_PACKETS_IN_FLIGHT }; // Flow control window size
     
     int _bandwidth { 1 }; // Exponential moving average for estimated bandwidth, in packets per second
     int _deliveryRate { 16 }; // Exponential moving average for receiver's receive rate, in packets per second
diff --git a/libraries/networking/src/udt/Constants.h b/libraries/networking/src/udt/Constants.h
new file mode 100644
index 0000000000..e8a7658bf9
--- /dev/null
+++ b/libraries/networking/src/udt/Constants.h
@@ -0,0 +1,28 @@
+//
+//  Constants.h
+//  libraries/networking/src/udt
+//
+//  Created by Clement on 7/13/15.
+//  Copyright 2015 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#pragma once
+
+#ifndef hifi_udt_Constants_h
+#define hifi_udt_Constants_h
+
+namespace udt {
+    static const int MAX_PACKET_SIZE_WITH_UDP_HEADER = 1500;
+    static const int MAX_PACKET_SIZE = MAX_PACKET_SIZE_WITH_UDP_HEADER - 28;
+    static const int MAX_PACKETS_IN_FLIGHT = 25600;
+    static const int CONNECTION_RECEIVE_BUFFER_SIZE_PACKETS = 8192;
+    static const int CONNECTION_SEND_BUFFER_SIZE_PACKETS = 8192;
+    static const int UDP_SEND_BUFFER_SIZE_BYTES = 1048576;
+    static const int UDP_RECEIVE_BUFFER_SIZE_BYTES = 1048576;
+    static const int DEFAULT_SYN_INTERVAL_USECS = 10 * 1000;
+}
+
+#endif // hifi_udt_Constants_h
diff --git a/libraries/networking/src/udt/Socket.cpp b/libraries/networking/src/udt/Socket.cpp
index c7c1d90666..650bdd7906 100644
--- a/libraries/networking/src/udt/Socket.cpp
+++ b/libraries/networking/src/udt/Socket.cpp
@@ -22,6 +22,8 @@ using namespace udt;
 Socket::Socket(QObject* parent) :
     QObject(parent)
 {
+    setSystemBufferSizes();
+    
     connect(&_udpSocket, &QUdpSocket::readyRead, this, &Socket::readPendingDatagrams);
     
     // make sure our synchronization method is called every SYN interval
@@ -38,17 +40,21 @@ void Socket::rebind() {
     _udpSocket.bind(QHostAddress::AnyIPv4, oldPort);
 }
 
-void Socket::setBufferSizes(int numBytes) {
+void Socket::setSystemBufferSizes() {
     for (int i = 0; i < 2; i++) {
         QAbstractSocket::SocketOption bufferOpt;
         QString bufferTypeString;
         
+        int numBytes = 0;
+        
         if (i == 0) {
             bufferOpt = QAbstractSocket::SendBufferSizeSocketOption;
+            numBytes = udt::UDP_SEND_BUFFER_SIZE_BYTES;
             bufferTypeString = "send";
             
         } else {
             bufferOpt = QAbstractSocket::ReceiveBufferSizeSocketOption;
+            numBytes = udt::UDP_RECEIVE_BUFFER_SIZE_BYTES;
             bufferTypeString = "receive";
         }
         
diff --git a/libraries/networking/src/udt/Socket.h b/libraries/networking/src/udt/Socket.h
index 7cf4283cf3..0bc23cdf0a 100644
--- a/libraries/networking/src/udt/Socket.h
+++ b/libraries/networking/src/udt/Socket.h
@@ -56,8 +56,6 @@ public:
     void setPacketFilterOperator(PacketFilterOperator filterOperator) { _packetFilterOperator = filterOperator; }
     void setPacketHandler(PacketHandler handler) { _packetHandler = handler; }
     
-    void setBufferSizes(int numBytes);
-    
     void addUnfilteredHandler(const HifiSockAddr& senderSockAddr, BasePacketHandler handler)
         { _unfilteredHandlers[senderSockAddr] = handler; }
     
@@ -68,6 +66,8 @@ private slots:
     void rateControlSync();
     
 private:
+    void setSystemBufferSizes();
+    
     QUdpSocket _udpSocket { this };
     PacketFilterOperator _packetFilterOperator;
     PacketHandler _packetHandler;
diff --git a/libraries/networking/src/udt/udt.cpp b/libraries/networking/src/udt/udt.cpp
deleted file mode 100644
index d580a9f7f8..0000000000
--- a/libraries/networking/src/udt/udt.cpp
+++ /dev/null
@@ -1,12 +0,0 @@
-//
-//  udt.cpp
-//
-//
-//  Created by Clement on 7/13/15.
-//  Copyright 2015 High Fidelity, Inc.
-//
-//  Distributed under the Apache License, Version 2.0.
-//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
-//
-
-#include "udt.h"
diff --git a/libraries/networking/src/udt/udt.h b/libraries/networking/src/udt/udt.h
deleted file mode 100644
index 74803151d1..0000000000
--- a/libraries/networking/src/udt/udt.h
+++ /dev/null
@@ -1,15 +0,0 @@
-//
-//  udt.h
-//
-//
-//  Created by Clement on 7/13/15.
-//  Copyright 2015 High Fidelity, Inc.
-//
-//  Distributed under the Apache License, Version 2.0.
-//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
-//
-
-#ifndef hifi_udt_h
-#define hifi_udt_h
-
-#endif // hifi_udt_h
\ No newline at end of file