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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>
| + | |
