North American Network Operators Group
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Re: [NANOG] Introducing latency for testing?

  • From: Joel Jaeggli
  • Date: Sat Jun 14 17:08:42 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:[email protected]] 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.