Re: [NANOG] Introducing latency for testing?

[Phil Regnauld <regnauld () catpipe net>]

Joel Jaeggli (joelja) writes:
> The freebsd dummynet driver is all about latency simulation...
>
> http://www.scalabledesign.com/articles/dummynet.html
>
> linux has a netem which can do the same thing
>
> http://www.linux-foundation.org/en/Net:Netem

        dummynet is significantly easier to set up, especially for
        doing things like random packet reordering / packet loss (using the
        'prob' rule of ipfw + delay property with pipes).

        ipfw pipe 42 config bw 1024Kbit/s delay 6ms
        ipfw pipe 666 config bw 64Kbit/s delay 350ms

        ipfw add 10 prob 0.05 deny ip from 1.2.3.4 to any
        ipfw add 10 prob 0.8 pipe 666 ip from A to B
        ipfw add 10 prob 0.5 pipe 42 ip from A to B

        ... and it runs.

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