[104229] in North American Network Operators' Group
Re: [NANOG] Introducing latency for testing?
daemon@ATHENA.MIT.EDU (Phil Regnauld)
Fri May 2 17:17:11 2008
Date: Fri, 2 May 2008 23:17:02 +0200
From: Phil Regnauld <regnauld@catpipe.net>
To: Joel Jaeggli <joelja@bogus.com>
In-Reply-To: <481B7998.9030303@bogus.com>
Cc: NANOG <nanog@merit.edu>
Errors-To: nanog-bounces@nanog.org
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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