author | Gustavo J. A. M. Carneiro <gjc@inescporto.pt> |
Fri, 17 Apr 2009 15:35:22 +0100 | |
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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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<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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<h1>Changes from ns-3.3 to ns-3.4</h1> |
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<h2>Changes to build system</h2> |
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<ul> |
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<li>A major option regarding the downloading and building of ns-3 has been |
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added for ns-3.4 -- the ns-3-allinone feature. This allows a user to |
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get the most common options for ns-3 downloaded and built with a minimum |
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amount of trouble. See the ns-3 tutorial for a detailed explanation of |
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how to use this new feature.</li> |
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<li>The build system now runs build items in parallel by default. This includes |
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the regression tests.</li> |
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</ul> |
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<h2>New API:</h2> |
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<ul> |
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<li>XML support has been added to the ConfigStore in /src/contrib/config-store.cc</li> |
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<li>The ns-2 calendar queue scheduler option has been ported to src/simulator</li> |
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<li>A ThreeLogDistancePropagationLossModel has been added to src/devices/wifi</li> |
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<li>ConstantAccelerationMobilityModel in src/mobility/constant-acceleration-mobility-model.h</li> |
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<li>A new emulation mode is supported with the TapBridge net device (see |
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src/devices/tap-bridge)</li> |
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<li>A new facility for naming ns-3 Objects is included (see |
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src/core/names.{cc,h})</li> |
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<li>Wifi multicast support has been added in src/devices/wifi</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>Some fairly significant changes have been made to the API of the |
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random variable code. Please see the ns-3 manual and src/core/random-variable.cc |
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for details.</li> |
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<li>The trace sources in the various NetDevice classes has been completely |
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reworked to allow for a consistent set of trace sources across the |
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devices. The names of the trace sources have been changed to provide |
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some context with respect to the level at which the trace occurred. |
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A new set of trace sources has been added which emulates the behavior |
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of packet sniffers. These sources have been used to implement tcpdump- |
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like functionality and are plumbed up into the helper classes. The |
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user-visible changes are the trace source name changes and the ability |
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to do promiscuous-mode pcap tracing via helpers. For further information |
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regarding these changes, please see the ns-3 manual</li> |
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<li>StaticMobilityModel has been renamed ConstantPositionMobilityModel |
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StaticSpeedMobilityModel has been renamed ConstantVelocityMobilityModel</li> |
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<li>The Callback templates have been extended to support more parameters. |
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See src/core/callback.h</li> |
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<li>Many helper API have been changed to allow passing Object-based parameters |
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as string names to ease working with the object name service.</li> |
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<li>The Config APIs now accept path segments that are names defined by the |
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object name service.</li> |
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<li>Minor changes were made to make the system build under the Intel C++ compiler.</li> |
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<li>Trace hooks for association and deassociation to/from an access point were |
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added to src/devices/wifi/nqsta-wifi-mac.cc</li> |
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</ul> |
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<h2>Changed behavior:</h2> |
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<ul> |
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<li>The tracing system rework has introduced some significant changes in the |
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behavior of some trace sources, specifically in the positioning of trace sources |
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in the device code. For example, there were cases where the packet transmit |
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trace source was hit before the packet was enqueued on the device transmit quueue. |
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This now happens just before the packet is transmitted over the channel medium. |
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The scope of the changes is too large to be included here. If you have concerns |
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regarding trace semantics, please consult the net device documentation for details. |
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As is usual, the ultimate source for documentation is the net device source code.</li> |
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</ul> |
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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> |
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Config::MatchContainer |
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NetDevice::IsBridge () |
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made public. |
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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> 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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<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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<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> JakesPropagationLossModel::GetLoss() moved to PropagationLoss() class</li> |
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</ul> |
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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/dacfd1f07538">dacfd1f07538</a></li> |
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consistency between devices. |
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<h2>changed behavior:</h2> |
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<h1>Changes from ns-3.1 to ns-3.2</h1> |
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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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|
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253 |
<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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256 |
<li> |
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257 |
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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<h2>New API in existing classes:</h2> |
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<ul> |
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|
266 |
<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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269 |
<li>class ArpCache has two new attributes: MaxRetries |
|
270 |
and a Drop trace. It also has some new public methods but these are |
|
271 |
mostly for internal use. |
|
272 |
</ul> |
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273 |
</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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|
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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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|
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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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316 |
|
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317 |
|
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<li>04-08-2008; changeset |
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319 |
<a href="http://code.nsnam.org/ns-3-dev/rev/cba7b2b80fe8">cba7b2b80fe8</a></li> |
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<ul> |
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321 |
<li> |
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Cleanup of MTU confusion and initialization in CsmaNetDevice<br> |
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323 |
The MTU of the CsmaNetDevice defaulted to 65535. This did not correspond with |
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324 |
the expected MTU found in Ethernet-like devices. Also there was not clear |
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325 |
documentation regarding which MTU was being set. There are two MTU here, one |
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326 |
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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328 |
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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330 |
mode, MAC MTU and PHY MTU while keeping the three values consistent. See the |
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331 |
Doxygen of CsmaNetDevice::SetMaxPayloadLength for a detailed description of the |
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332 |
issues and solution. |
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333 |
</li> |
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334 |
</ul> |
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335 |
|
3505 | 336 |
<li>21-07-2008; changeset |
337 |
<a href=" |
|
338 |
http://code.nsnam.org/ns-3-dev/rev/99698bc858e8">99698bc858e8</a></li> |
|
339 |
<ul> |
|
340 |
<li> class NetDevice has added a pure virtual method that |
|
341 |
must be implemented by all subclasses: |
|
342 |
<pre> |
|
343 |
virtual void SetPromiscReceiveCallback (PromiscReceiveCallback cb) = 0; |
|
344 |
</pre> |
|
345 |
All NetDevices must support this method, and must call this callback |
|
346 |
when processing packets in the receive direction (the appropriate place |
|
347 |
to call this is device-dependent). An approach to stub this out |
|
348 |
temporarily, if you do not care about immediately enabling this |
|
349 |
functionality, would be to add this to your device: |
|
350 |
<pre> |
|
351 |
void |
|
352 |
ExampleNetDevice::SetPromiscReceiveCallback |
|
353 |
(NetDevice::PromiscReceiveCallback cb) |
|
354 |
{ |
|
355 |
NS_ASSERT_MSG (false, "No implementation yet for |
|
356 |
SetPromiscReceiveCallback"); |
|
357 |
} |
|
358 |
</pre> |
|
359 |
To implement this properly, consult the CsmaNetDevice for examples of |
|
360 |
when the m_promiscRxCallback is called. |
|
361 |
</li> |
|
362 |
</ul> |
|
363 |
||
364 |
<li>03-07-2008; changeset |
|
365 |
<a href="http://code.nsnam.org/ns-3-dev/rev/d5f8e5fae1c6">d5f8e5fae1c6</a></li> |
|
366 |
<ul> |
|
367 |
<li> |
|
368 |
Miscellaneous cleanup of Udp Helper API, to fix bug 234 |
|
369 |
<pre> |
|
370 |
class UdpEchoServerHelper |
|
371 |
{ |
|
372 |
public: |
|
373 |
- UdpEchoServerHelper (); |
|
374 |
- void SetPort (uint16_t port); |
|
375 |
+ UdpEchoServerHelper (uint16_t port); |
|
376 |
+ |
|
377 |
+ void SetAttribute (std::string name, const AttributeValue &value); |
|
378 |
ApplicationContainer Install (NodeContainer c); |
|
379 |
||
380 |
class UdpEchoClientHelper |
|
381 |
{ |
|
382 |
public: |
|
383 |
- UdpEchoClientHelper (); |
|
384 |
+ UdpEchoClientHelper (Ipv4Address ip, uint16_t port); |
|
385 |
- void SetRemote (Ipv4Address ip, uint16_t port); |
|
386 |
- void SetAppAttribute (std::string name, const AttributeValue &value); |
|
387 |
+ void SetAttribute (std::string name, const AttributeValue &value); |
|
388 |
ApplicationContainer Install (NodeContainer c); |
|
389 |
</pre> |
|
390 |
</li> |
|
391 |
</ul> |
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392 |
|
3505 | 393 |
<li>03-07-2008; changeset |
394 |
<a href=" |
|
395 |
http://code.nsnam.org/ns-3-dev/rev/3cdd9d60f7c7">3cdd9d60f7c7</a></li> |
|
396 |
<ul> |
|
397 |
<li> |
|
398 |
Rename all instances method names using "Set..Parameter" to "Set..Attribute" |
|
399 |
(bug 232) |
|
400 |
</li> |
|
401 |
<li> How to fix your code: Any use of helper API that was using a method |
|
402 |
"Set...Parameter()" should be changed to read "Set...Attribute()". e.g. |
|
403 |
<pre> |
|
404 |
- csma.SetChannelParameter ("DataRate", DataRateValue (5000000)); |
|
405 |
- csma.SetChannelParameter ("Delay", TimeValue (MilliSeconds (2))); |
|
406 |
+ csma.SetChannelAttribute ("DataRate", DataRateValue (5000000)); |
|
407 |
+ csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2))); |
|
408 |
</pre> |
|
409 |
</li> |
|
410 |
</ul> |
|
411 |
</li> |
|
3686 | 412 |
|
3505 | 413 |
</ul> |
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414 |
<h2>Changed behavior:</h2> |
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|
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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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Being able to set the receiver buffer size through the attributes system. |
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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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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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</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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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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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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instability in neighbor detection. |
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