Re: Introducing latency for testing?

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Introducing latency for testing?
\ Mike Lyon (2 May 2008)
. \ C. Tate Baumrucker (2 May 2008)
. . \ Deepak Jain (2 May 2008)
. . . \ Mike Lyon (2 May 2008)
. \ Geoff Lisk (2 May 2008)
. \ Stephane Bortzmeyer (2 May 2008)
. \ Joel Jaeggli (2 May 2008)
. . \ Phil Regnauld (2 May 2008)
. \ charles (2 May 2008)

33 msg	fair warning: less than 1000 days left to IPv4 ...

Subject:	Re: Introducing latency for testing?
Group:	Nanog
From:	Phil Regnauld
Date:	2 May 2008

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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