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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?"

3 of 76 comments (clear)

  1. FreeBSD Dummynet by Inominate · · Score: 3, Insightful

    FreeBSD's dummynet can quite easily do it. I suspect the same of openbsd and linux.

    What kind of question is this for ask slashdot?

  2. Re:In related news by menscher · · Score: 2, Insightful
    Made all the better when they discover that southern hemisphere monitors actually *are* different for exactly the same reason.

    I call bull. The Earth's magnetic field is far too weak to have an effect on anything like that. Besides, don't you think someone might notice if it mattered whether your monitor was facing north or south? You really shouldn't believe everything your BOFH tells you.

  3. link in Netkit.org by Anonymous Coward · · Score: 1, Insightful

    I've seen a tool "delayer", in a paper on www.netkit.org, used for testing TCP windowing negotiation
    http://www.netkit.org/docs/netkit-clark-and-nagle- 01.pdf
    JurgenK.