[NANOG] Introducing latency for testing?

Joel Jaeggli joelja at bogus.com
Sat Jun 14 21:08:25 UTC 2008

Chris Marlatt wrote:
> Frank Bulk - iNAME wrote:
>> It's not free, but at a recent trade show I did see what appeared to 
>> be an
>> affordable unit from Apposite Technologies (apposite-tech.com).  And 
>> there's
>> always PacketStorm.
>> Frank
>> -----Original Message-----
>> From: Mike Lyon [mailto:mike.lyon at gmail.com] Sent: Friday, May 02, 
>> 2008 3:13 PM
>> To: NANOG
>> Subject: [NANOG] Introducing latency for testing?
>> So I want to mimic some latency in a test network for DB replication.
>> I am wondering what other's have used for this? Obviously, the best
>> way to would be to actually have one box across the US or across the
>> globe to actually test against but what if you don't have that?

boxes across the globe have the property of being somewhat less 
deterministic than you'd like if you need repeatability.

> IIRC ipfw can do this using dummynet and the delay directive.

it will also do jitter and drop rate...

to wit, it's exactly what is need here.

there are analogous tools for iptables based platforms.

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