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<center><big>The Network Simulator ns-3: Frequently Asked Questions (FAQ)</big> </center>
 
This wiki page is devoted to questions for <b>users</b> of the simulator. There is a similar [[Developer_FAQ]] page for ns-3 <b>software developers and maintainers</b>.
 
__TOC__
 
== What is the difference between ns-2 and ns-3? ==
 
[http://www.isi.edu/nsnam/ns ns-2] is a popular discrete-event network simulator developed under several previous research grants and activities.  It remains in active use and will continue to be maintained.
 
[http://www.nsnam.org ns-3] is a new software development effort focused on improving upon the core architecture, software integration, models, and educational components of ns-2.  The project commenced in July 2006 and there have not yet been any releases (pre-alpha stage).
 
If you are looking for a simulator to currently use for research, please use ns-2.
 
== Will ns-2 scripts run on ns-3? ==
No.  ns-2 uses OTcl as its scripting environment.  ns-3 will use C  programs or python scripts to define simulations.
 
== I found a bug in ns-3.  How do I report it? ==
 
Please consult [http://www.nsnam.org/contributing.html#bugs this page].  Also, please consider fixing the bug, not just reporting it :)
 
== Mercurial ==
 
=== merging a separate repository with a main repository ===
 
Q.  I want to incorporate some code from a mercurial branch (repository) that is off the main repository.
 
A.  (from Mathieu Lacage)
 
You can create a local clone of the repository and pull into it from the main repository:
you can push these yourself by creating a
local clone of that repo and then pushing it back to the main repo. It
will keep the original history; e.g.:
 
<pre>
hg clone http://code.nsnam.org/mathieu/ns-3-ptr
cd ns-3-ptr
# merge from main ns-3 repository into this other repository
hg pull http://code.nsnam.org/ns-3
hg merge
</pre>
 
Pushing this new merged repository into another repository will then keep the original change history:
<pre>
# push back-- must have privileges to push to the repository
hg push ssh://code@code.nsnam.org/repos/ns-3
</pre>
 
=== working with subsets of repositories ===
 
Q.  Is there a way with mercurial to pull/merge/push subsets of the repositories?  For instance, suppose I wanted only to grab the samples directory from a repo and merge that alone.
 
A.  (from Mathieu Lacage)  You cannot cherry-pick individual changesets other than by exporting
them to patches first. The reason is that each Changeset contains a
single hash which is, among others, based on the hash of the 'parent'
changeset hash. So, if you 'reparent' a changeset, you change its hash
id because the id of the parent changes. If the hash id of a changeset
changes, it is a different changeset so, mercurial cannot really manage
these individual changesets.  There is, however, the [http://www.selenic.com/mercurial/wiki/index.cgi/TransplantExtension transplant extension] that lets you do just that.
 
So, the idea is that merging happens from one repo to another, and
cannot be done on a sub-dir basis. The other alternatives are:
 
1) the latest mercurial has support for in-repo branches: you can
maintain multiple branches within a single repository but each branch
represents a branch for the whole repository.
 
2) the latest mercurial contains the [http://www.selenic.com/mercurial/wiki/index.cgi/ForestExtension forest extension] which is a way
to make mercurial manage a 'forest' of repos: each repo is independent
but they also behave as a single big repo through the forest extension.
 
== Scons (build process) ==
 
===  Library not loaded error ===
Question:  On Apple osX, I built ns-3 successfully, but when I try to run a sample program I get something like:
<pre>
> ./sample-packet
dyld: Library not loaded: build-dir/dbg-shared/lib/libcommon.dylib
  Referenced from: /tmp/ns-3/build-dir/dbg-shared/bin/./sample-packet
  Reason: image not found
Trace/BPT trap
</pre>
 
Answer:  This is because the library path variable of your environment does not include the location where the ns-3 modules (libraries) are located.
 
In OS X, you need to set the DYLD_LIBRARY_PATH variable to include the library directory.  These need to include the lib/ directory where these ns-3 libraries are built. On Linux and Solaris systems, you should never warnings of this kind. If you do, please, report a bug.
 
In this example, setting
DYLD_LIBRARY_PATH=/tmp/ns-3/build-dir/dbg-shared/lib/
will work.
 
=== How do I do the equivalent of a "make clean"? ===
<pre>
scons -c
</pre>

Revision as of 00:47, 1 July 2007