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author Tom Henderson <tomh@tomh.org>
Mon, 15 Dec 2008 07:25:27 -0800
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add device chapters to manual
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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
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<html>
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<head>
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   <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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   <title>ns-3 Change Log</title>
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</head>
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<body>
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<h1>
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ns-3: API and model change history</h1>
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<!--
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This ChangeLog is updated in the reverse order 
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with the most recent changes coming first.  Date format:  DD-MM-YYYY
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-->
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<p>
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ns-3 is an evolving system and there will be API or behavioral changes
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from time to time.   Users who try to use scripts or models across
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versions of ns-3 may encounter problems at compile time, run time, or
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may see the simulation output change.  </p>
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<p>
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We have adopted the development policy that we are going to try to ease
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the impact of these changes on users by documenting these changes in a
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single place (this file), and not by providing a temporary or permanent
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backward-compatibility software layer.  </p>
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<p>
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The goal is that users who encounter a problem when trying to use older
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code with newer code should be able to consult this file to find
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guidance as to how to fix the problem.  For instance, if a method name
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or signature has changed, it should be stated what the new replacement
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name is. </p>
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<p>
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Note that users who upgrade the simulator across versions, or who work
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directly out of the development tree, may find that simulation output
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changes even when the compilation doesn't break, such as when a
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simulator default value is changed.  Therefore, it is good practice for
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_anyone_ using code across multiple ns-3 releases to consult this file,
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as well as the RELEASE_NOTES, to understand what has changed over time.
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</p>
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<p>
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This file is a best-effort approach to solving this issue; we will do
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our best but can guarantee that there will be things that fall through
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the cracks, unfortunately.  If you, as a user, can suggest improvements
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to this file based on your experience, please contribute a patch or drop
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us a note on ns-developers mailing list.  </p>
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<hr>
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<h1>changes from ns-3.2 to ns-3.3</h1>
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<h2>new API:</h2>
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<ul>
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<li> ns-3 ABORT macros in src/core/abort.h</li>
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<li> Config::MatchContainer </li>
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<li> ConstCast and DynamicCast helper functions for Ptr casting</li>
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<li> StarTopology added to several topology helpers </li>
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<li> NetDevice::IsBridge () </li>
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<li>17-11-2008; changeset 
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<a href="http://code.nsnam.org/ns-3-dev/rev/4c1c3f6bcd03">4c1c3f6bcd03</a></li>
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<ul>
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<li>
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The PppHeader previously defined in the point-to-point-net-device code has been 
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made public.
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</li>
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</ul>
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<li>17-11-2008; changeset 
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<a href="http://code.nsnam.org/ns-3-dev/rev/16c2970a0344">16c2970a0344</a></li>
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<ul>
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<li>
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An emulated net device has been added as enabling technology for ns-3 emulation
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scenarios.  See src/devices/emu and examples/emu-udp-echo.cc for details.
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</li>
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</ul>
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<li>17-11-2008; changeset 
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<a href="http://code.nsnam.org/ns-3-dev/rev/4222173d1e6d">4222173d1e6d</a></li>
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<ul>
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<li>
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Added method InternetStackHelper::EnableAsciiChange to allow allow a user to 
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hook ascii trace to the drop trace events in Ipv4L3Protocol and ArpL3Protocol.
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</li>
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</ul>
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</ul>
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<h2>changes to existing API:</h2>
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<ul>
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<li> NetDevice::MakeMulticastAddress() was renamed to NetDevice::GetMulticast()
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and the original GetMulticast() removed </li>
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<li> Socket API changes:
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<ul>
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<li> return type of SetDataSentCallback () changed from bool to void </li>
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<li> Socket::Listen() no longer takes a queueLimit argument</li>
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</ul>
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<li> As part of the Wifi Phy rework, there have been several API changes
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at the low level and helper API level.  </li>
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<ul>
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<li>  At the helper API level, the WifiHelper was split to three classes: 
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a WifiHelper, a YansWifiChannel helper, and a YansWifiPhy helper.  Some
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functions like Ascii and Pcap tracing functions were moved from class
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WifiHelper to class YansWifiPhyHelper. 
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<li>  At the low-level API, there have been a number of changes to
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make the Phy more modular:</li>
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<ul>
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<li> composite-propagation-loss-model.h is removed</li>
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<li> DcfManager::NotifyCcaBusyStartNow() has changed name</li>
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<li> fragmentation related functions (e.g. DcaTxop::GetNFragments()) have
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changed API to account for some implementation changes</li>
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<li> Interference helper and error rate model added </li>
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<li> JakesPropagationLossModel::GetLoss() moved to PropagationLoss() class</li>
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<li> base class WifiChannel made abstract </li>
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<li> WifiNetDevice::SetChannel() removed </li>
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<li> a WifiPhyState helper class added </li>
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<li> addition of the YansWifiChannel and YansWifiPhy classes </li>
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</ul>
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</ul>
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<a href="http://code.nsnam.org/ns-3-dev/rev/dacfd1f07538">dacfd1f07538</a></li>
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<ul>
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<li>
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Change attribute "RxErrorModel" to "ReceiveErrorModel" in CsmaNetDevice for 
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consistency between devices.
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</li>
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</ul>
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</ul>
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<h2>changed behavior:</h2>
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<ul>
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<a href="http://code.nsnam.org/ns-3-dev/rev/ed0dfce40459">ed0dfce40459</a></li>
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<ul>
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<li>
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Relax reasonableness testing in Ipv4AddressHelper::SetBase to allow the 
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assignment of /32 addresses.
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</li>
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</ul>
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<a href="http://code.nsnam.org/ns-3-dev/rev/756887a9bbea">756887a9bbea</a></li>
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<ul>
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<li>
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Global routing supports bridge devices.
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</li>
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</ul>
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</ul>
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<hr>
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<h1>changes from ns-3.1 to ns-3.2</h1>
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<h2>new API:</h2>
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<ul>
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<li>26-08-2008; changeset 
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<a href="http://code.nsnam.org/ns-3-dev/rev/5aa65b1ea001">5aa65b1ea001</a></li>
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<ul>
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<li>
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Add multithreaded and real-time simulator implementation.  Allows for emulated
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net devices running in threads other than the main simulation thread to schedule
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events.  Allows for pacing the simulation clock at 1x real-time.
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</li>
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</ul>
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<li>26-08-2008; changeset 
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<a href="http://code.nsnam.org/ns-3-dev/rev/c69779f5e51e">c69779f5e51e</a></li>
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<ul>
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<li>
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Add threading and synchronization primitives.  Enabling technology for 
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multithreaded simulator implementation.
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</li>
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</ul>
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</ul>
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<h2>new API in existing classes:</h2>
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<ul>
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<li>01-08-2008; changeset 
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<a href="http://code.nsnam.org/ns-3-dev/rev/a18520551cdf">a18520551cdf</a></li>
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<ul>
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<li>class ArpCache has two new attributes:  MaxRetries 
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and a Drop trace.  It also has some new public methods but these are 
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mostly for internal use.
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</ul>
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</li>
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</ul>
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<h2>changes to existing API:</h2>
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<ul>
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<li>05-09-2008; changeset 
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<a href="http://code.nsnam.org/ns-3-dev/rev/aa1fb0f43571">aa1fb0f43571</a></li>
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<ul>
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<li>
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Change naming of MTU and packet size attributes in CSMA and Point-to-Point devices<br>
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After much discussion it was decided that the preferred way to think about 
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the different senses of transmission units and encapsulations was to call the 
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MAC MTU simply MTU and to use the overall packet size as the PHY-level attribute
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of interest.  See the Doxygen of CsmaNetDevice::SetFrameSize and 
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PointToPointNetDevice::SetFrameSize for a detailed description.
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</li>
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</ul>
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<li>25-08-2008; changeset 
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<a href="http://code.nsnam.org/ns-3-dev/rev/e5ab96db540e">e5ab96db540e</a></li>
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<ul>
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<li>
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bug 273: constify packet pointers.<br>
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The normal and the promiscuous receive callbacks of the NetDevice API
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have been changed from:
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<pre>
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Callback<bool,Ptr<NetDevice>,Ptr<Packet>,uint16_t,const Address &>
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Callback<bool,Ptr<NetDevice>, Ptr<Packet>, uint16_t,
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         const Address &, const Address &, enum PacketType >
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</pre>
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to:
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<pre>
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Callback<bool,Ptr<NetDevice>,Ptr<const Packet>,uint16_t,const Address &>
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Callback<bool,Ptr<NetDevice>, Ptr<const Packet>, uint16_t,
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         const Address &, const Address &, enum PacketType >
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</pre>
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to avoid the kind of bugs reported in 
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<a href="http://www.nsnam.org/bugzilla/show_bug.cgi?id=273">bug 273</a>.
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Users who implement a subclass of the NetDevice base class need to change the signature
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of their SetReceiveCallback and SetPromiscReceiveCallback methods.
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</li>
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</ul>
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<li>04-08-2008; changeset 
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<a href="http://code.nsnam.org/ns-3-dev/rev/cba7b2b80fe8">cba7b2b80fe8</a></li>
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<ul>
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<li>
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Cleanup of MTU confusion and initialization in CsmaNetDevice<br>
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The MTU of the CsmaNetDevice defaulted to 65535.  This did not correspond with
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the expected MTU found in Ethernet-like devices.  Also there was not clear 
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documentation regarding which MTU was being set.  There are two MTU here, one
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at the MAC level and one at the PHY level.  We split out the MTU setting to make
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this more clear and set the default PHY level MTU to 1500 to be more like
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Ethernet.  The encapsulation mode defaults to LLC/SNAP which then puts the
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MAC level MTU at 1492 by default.  We allow users to now set the encapsulation
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mode, MAC MTU and PHY MTU while keeping the three values consistent.  See the
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Doxygen of CsmaNetDevice::SetMaxPayloadLength for a detailed description of the
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issues and solution.
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</li>
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</ul>
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<li>21-07-2008; changeset 
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<a href="
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http://code.nsnam.org/ns-3-dev/rev/99698bc858e8">99698bc858e8</a></li>
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<ul>
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<li> class NetDevice has added a pure virtual method that
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must be implemented by all subclasses:
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<pre>
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virtual void SetPromiscReceiveCallback (PromiscReceiveCallback cb) = 0;
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</pre>
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All NetDevices must support this method, and must call this callback
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when processing packets in the receive direction (the appropriate place
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to call this is device-dependent).  An approach to stub this out
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temporarily, if you do not care about immediately enabling this
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functionality, would be to add this to your device:
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<pre>
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void
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ExampleNetDevice::SetPromiscReceiveCallback
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(NetDevice::PromiscReceiveCallback cb)
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{ 
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  NS_ASSERT_MSG (false, "No implementation yet for
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SetPromiscReceiveCallback");
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}
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</pre>
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To implement this properly, consult the CsmaNetDevice for examples of
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when the m_promiscRxCallback is called.
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</li>
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</ul>
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<li>03-07-2008; changeset 
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<a href="http://code.nsnam.org/ns-3-dev/rev/d5f8e5fae1c6">d5f8e5fae1c6</a></li>
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<ul>
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<li>
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Miscellaneous cleanup of Udp Helper API, to fix bug 234
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<pre>
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class UdpEchoServerHelper
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{
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public:
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- UdpEchoServerHelper ();
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- void SetPort (uint16_t port); 
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+ UdpEchoServerHelper (uint16_t port);
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+ 
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+ void SetAttribute (std::string name, const AttributeValue &value);
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ApplicationContainer Install (NodeContainer c);
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class UdpEchoClientHelper
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{
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public:
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- UdpEchoClientHelper ();
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+ UdpEchoClientHelper (Ipv4Address ip, uint16_t port);
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- void SetRemote (Ipv4Address ip, uint16_t port);
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- void SetAppAttribute (std::string name, const AttributeValue &value);
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+ void SetAttribute (std::string name, const AttributeValue &value);
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ApplicationContainer Install (NodeContainer c);
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</pre>
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</li>
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</ul>
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<li>03-07-2008; changeset 
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<a href="
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http://code.nsnam.org/ns-3-dev/rev/3cdd9d60f7c7">3cdd9d60f7c7</a></li>
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<ul>
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<li>
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Rename all instances method names using "Set..Parameter" to "Set..Attribute"
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(bug 232)
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</li>
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<li> How to fix your code:  Any use of helper API that was using a method
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"Set...Parameter()" should be changed to read "Set...Attribute()".  e.g.
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<pre>
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- csma.SetChannelParameter ("DataRate", DataRateValue (5000000));
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- csma.SetChannelParameter ("Delay", TimeValue (MilliSeconds (2)));
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+ csma.SetChannelAttribute ("DataRate", DataRateValue (5000000));
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+ csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));
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</pre>
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</li>
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</ul>
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</li>
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</ul>
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<h2>changed behavior:</h2>
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<ul>
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<li>07-09-2008; changeset 
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<a href="http://code.nsnam.org/ns-3-dev/rev/5d836ab1523b">5d836ab1523b</a></li>
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<ul>
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<li>
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Implement a finite receive buffer for TCP<br>
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The native TCP model in TcpSocketImpl did not support a finite receive buffer.
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This changeset adds the following functionality in this regard:
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<ul>
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<li>
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Being able to set the receiver buffer size through the attributes system.
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</li>
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<li>
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This receiver buffer size is now correctly exported in the TCP header as the
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advertised window.  Prior to this changeset, the TCP header advertised window
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was set to the maximum size of 2^16 bytes.
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window
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</li>
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<li>
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The aforementioned window size is correctly used for flow control, i.e. the
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sending TCP will not send more data than available space in the receiver's
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buffer.
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</li>
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<li>
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In the case of a receiver window collapse, when a advertised zero-window
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packet is received, the sender enters the persist probing state in which
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it sends probe packets with one payload byte at exponentially backed-off
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intervals up to 60s.  The reciever will continue to send advertised 
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zero-window ACKs of the old data so long as the receiver buffer remains full.
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When the receiver window clears up due to an application read, the TCP
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will finally ACK the probe byte, and update its advertised window appropriately.
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</li>
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</ul>
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See 
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<a href="http://www.nsnam.org/bugzilla/show_bug.cgi?id=239"> bug 239 </a> for
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more.
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</li>
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</ul>
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<li>07-09-2008; changeset 
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<a href="http://code.nsnam.org/ns-3-dev/rev/7afa66c2b291">7afa66c2b291</a></li>
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<ul>
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<li>
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Add correct FIN exchange behavior during TCP closedown<br>
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The behavior of the native TcpSocketImpl TCP model was such that the final
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FIN exchange was not correct, i.e. calling Socket::Close didn't send a FIN
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packet, and even if it had, the ACK never came back, and even if it had, the
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ACK would have incorrect sequence number.  All these various problems have been
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addressed by this changeset.  See 
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<a href="http://www.nsnam.org/bugzilla/show_bug.cgi?id=242"> bug 242 </a> for
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more.
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</li>
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</ul>
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<li> 28-07-2008; changeset 
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<a href="http://code.nsnam.org/ns-3-dev/rev/6f68f1044df1">6f68f1044df1</a>
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<ul>
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<li>
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OLSR: HELLO messages hold time changed to 3*hello
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interval from hello interval.  This is an important bug fix as
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hold time == refresh time was never intentional, as it leads to
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instability in neighbor detection.
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</ul>
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</li>
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</ul>
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</body>
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</html>