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From: Phil Regnauld (no email)
Date: Fri May 02 2008 - 17:17:02 EDT
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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