[c-nsp] Simulating latency?

[Michael Loftis]

--On May 14, 2005 9:53:59 AM -0500 Zeus da dog <zeus at pobox.com> wrote:

>
> Sometimes I need to test customer's application to see if it will work on
> WAN links, or show what the performance will look like.  It's easy to
> setup a testing environment for bandwidth limitation of the WAN by using
> a router and rate limiting it.  One thing I can't do is to simulate the
> latency that may be added on a long WAN link or a VPN connection.  Is
> there a way to add latency with a Cisco router?  If not, any other
> application out there that I can use?

Not with Cisco no.  FreeBSD has ipfw pipe's that can be programmed for a 
delay (very accurately), queueing, random drops, and other such things, 
obviously including rate limiting.  I've always used this method when I've 
needed to work with something like this.