7. Frequently Asked Questions

This section lists the frequently asked questions and their answers.

  1. Q: When are you going to port nettimer to Windows NT, Solaris, FreeBSD, OS X, etc.?

    A: I'm not planning to do any ports, but I will accept patches for ports.

  2. Q: Why is nettimer dumping core or giving bizarre output?

    A: Send me a tcpdump trace that causes the problem and I will look at it. If you can't generate a tcpdump trace that causes the problem, then it will be very difficult for me to fix the problem.

  3. Q: Why is nettimer is giving me little or no output in passive bottleneck bandwidth measurement mode?

    A: Nettimer does not generate its own probe traffic in passive bottleneck bandwidth measurement mode. This is supposed to be feature so that it does not burden the network. If you want to generate some artificial traffic just to measure bandwidth, then run it in active probing mode or use ping while nettimer is running:
    	      ping -c 10 -l 10 -s 1400 some.I.P.address
    	    
    This will send 20 1408 byte packets back-to-back to some.I.P.address. You need to be root to use these options to ping. You should reduce the 20 to something smaller if you are on a low bandwidth link. Don't do this too often because it's hard on the network.