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Simulating Network Latency?

Posted by Cliff on from the network-testbed-technology dept.

ixmo asks: "I've just come around an interesting problem: to simulate low-bandwidth network links without buying expensive WAN simulators, I can connect two old Cisco routers back to back with serial cables, and control the bandwidth via the 'clock rate' IOS command, but how can I simulate network latency? Is there some OS tool or patch (for Linux/OpenBSD) that allows for tuning of network delay? Any hints?"

7 of 76 comments (clear)

  1. The solution is obvious. by mayoff · · Score: 5, Funny

    Use a longer cable.

    1. Re:The solution is obvious. by BrynM · · Score: 4, Funny
      Use a longer cable.
      Or do what my last job did: Use CAT-3! Oh, you're just testing... Too bad they weren't.
      --
      US Democracy:The best person for the job (among These pre-selected choices...)
  2. Stand next to the router and... by stefanlasiewski · · Score: 4, Funny

    Stand next to the router and simulate rough conditions... ... yank out the wire a couple times. ... play kick the router. ... simulate lightening by plugging a network cable into a 220V plug ... paint sunspots on your face and spew out some EMF pulses like the sun.

    --
    "Can of worms? The can is open... the worms are everywhere."
    1. Re:Stand next to the router and... by Piquan · · Score: 4, Funny

      Don't forget the most fun part of cable simulation: the backhoe!

  3. In related news by WasterDave · · Score: 4, Funny

    It's good fun telling people who come down here to visit (New Zealand) that the twists in our cat 5 go the other way - because the earth's magnetic field is reversed.

    Made all the better when they discover that southern hemisphere monitors actually *are* different for exactly the same reason.

    Dave

    --
    I write a blog now, you should be afraid.
  4. Simple by Anonymous Coward · · Score: 5, Funny

    Sign up with Comcast.

  5. Do what I do by laejoh · · Score: 3, Funny

    1. I put a linux box acting as router, firewall, apache server and internet connection on the network.

    2. Then I post a story on slashdot with a link to the apache server.

    3. ???

    4. Instant latency!

    (And by carefully choosing the size of the documents/jpegs/mpegs I can actually simulate different kinds of latency!!!)