Commit 9bf7d5eb authored by Mac Newbold's avatar Mac Newbold
Browse files

Add question about wanting shaped links and not seeing any shaping.

parent 930628e6
......@@ -57,6 +57,9 @@
parameters on my links?</a>
<li> <a href="#HDS-7">Are there other traffic shaping parameters
besides latency, bandwidth, and PLR?</a>
<li> <a href="#HDS-8">I asked for traffic shaping, but everything
seems to be going at full LAN speeds.
What's wrong?</a>
</ul>
<li> <a href="#SWS">Software setup</a>
......@@ -596,6 +599,30 @@
changes made, simply execute the file using the <a href="#UTT-2">
sudo</a> command.
</p>
<li><a NAME="HDS-8"></a>
<h3>I asked for traffic shaping, but everything seems to be going at
full LAN speeds. What's wrong?</h3>
<p>
The most likely problem is that it is using the unshaped control
network for the traffic you're looking at. This occurs when it
tries to contact a node using a "pcXXX" address, like pc76 or
pc76.emulab.net, or when it tries to ping a fully-qualified name,
like NodeA.myexpt.myproj.emulab.net , which also resolves to a
control network address. On one of your nodes, take a look at the
file /etc/hosts . It shows the IP addresses and aliases that refer
to the different experimental interfaces. These are the names/IPs
you can use to see the delays.
<p>
For instance, let's say I have an experiment that had NodeA and
NodeB connected with a shaped link. The file /etc/hosts on NodeA
would have a line for NodeB, with an address like 192.168.1.3, and
on NodeB there would be an entry for NodeA with the address
192.168.1.2. These addresses correspond to the delayed link
between them. Any address outside the 192.168.*.* range that you
didn't configure manually corresponds to an unshaped link.
</p>
</ul>
<hr>
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