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    Traffic simulation tools

    Scheduled Pinned Locked Moved Traffic Shaping
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    • KOMK
      KOM
      last edited by

      Does anyone have any suggestions for tools to simulate or generate network traffic for use with Traffic-shaping testing?  Something that lets you specify duration, bandwidth & ports, and then it spew out random packets of the specified port(s) at the specified bandwidth rate.  Nothing that requires reading a tome to figure out.

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      • N
        Nullity
        last edited by

        There are quite a few out there for local testing, like netperf or iperf.

        Here is a quote from Kenjiro Cho, ALTQ creator ; http://www.iijlab.net/~kjc/software/TIPS.txt

        1.4 Traffic Generation
            Even when you have a bottleneck, it is not a simple task to control
            the queue length.
            I recommend to use TCP; a UDP stream just overflows the queue and
            eats up the CPU power and the link bandwidth.
            But a single TCP will not grow the queue length; TCP is clever
            enough!
        
            You have to run multiple TCP streams to observe some interesting
            traffic dynamics.
        
            The following simple script works for me.
        
        		#!/bin/sh
        		PATH=/bin:/usr/bin:/usr/local/bin
        		export PATH
        
        		dest=dest-host-name
        		sec=20
        		win=48K
        		size=8K
        		netperf -H $dest -l $sec – -m $size -s $win -S $win &
        		sleep 3
        		netperf -H $dest -l $sec -- -m $size -s $win -S $win &
        		sleep 3
        		netperf -H $dest -l $sec -- -m $size -s $win -S $win &
        		sleep 3
        		netperf -H $dest -l $sec -- -m $size -s $win -S $win
        
        

        For the testing the dynamics of larger networks, there are things like ns2 and ns3 but they are too complex for anyone but academians.

        IMUNES is pretty good, but I did not know enough about FreeBSD virtualization to enable ALTQ, so I gave up, for now.

        There are some Linux-based simulators out there but iptables can go to hell, all day, every day, imo.

        This site has some good reviews.
        http://www.brianlinkletter.com/open-source-network-simulators/

        If you find anything interesting, please share! :)

        Please correct any obvious misinformation in my posts.
        -Not a professional; an arrogant ignoramous.

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        • KOMK
          KOM
          last edited by

          Yeah, I also spent time looking at traffic generators and network simulators.  I didn't find anything that hit the sweet spot.  I don't have the time to learn some massive framework so I was hoping for something not too complex.  Thanks for replying.

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          • N
            Nullity
            last edited by

            My next venture is to learn more about debugging ALTQ so I can see more stats. I am assuming I will need to resort to a full FreeBSD to get more control of the system though. Learning more about FreeBSD is probably a good idea.

            I bet that the bufferbloat/Codel mailing-list has some great info about how to simulate traffic for testing.

            I have only played with netperf casually. The few worthwhile tests I ran I did with either multiple sessions of iperf, or multiple sessions of netcat/nc. Netcat is insanely powerful. Every few months since I learned of netcat I am amazed by how powerful the simple tool can be; "netcat host2 port < /dev/zero" to a listening netcat and bam, single stream TCP/UDP traffic. or send a file with the same method. or create a remote shell. That is just the standard uses.

            There is gns3, but it is Cisco emulation primarily. Good userbase and polished interface.

            There must be a good, simple simulator, right? Call DARPA maybe? ;)

            Please correct any obvious misinformation in my posts.
            -Not a professional; an arrogant ignoramous.

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