[nsp] Re: cisco-nsp Digest, Vol 19, Issue 5

[Rutger Bevaart]

there's actually a pretty easy solution. grab an install ISO for FreeBSD from
the net (5.2.1 preferably) and install it on an old PC lying around in the
office.

create some alias addresses and then use the ipfw module to create 'bandwidth
and delay' pipes. if you've got ip routing enabled on the box (just add some
static routes) you can simulate an advanced network simulator with bandwidth
and delay specifics. just using the command line you can change the delay and
bandwidth...

i did this from a VMWare session on my laptop to test an ERP package before
rollout of a new WAN to show the new WAN was not going to solve the performance
problems, they were delay related ;-)

the caveat is that you can't get below the 2-3ms delay incurred by the software
routing...

> >Hi all,
> >
> >I need to do some software tests between our main site and equipment
> >that will be collocated some 200ms from here.
> >I'd like to simulate the latency and some bandwidth limitation - let say
> >256Kbps.
> >
> >The testing equipment I have on-hands is:
> >A couple of 250x routers, ( I tough to put them with serials back to
> >back but can't find the Female V35 cable and it will not create the
> >desired latency anyway). 
> >A 2600 router with a couple of ethernets and one serial port.
> >An old 4500 router (enterprises image) . 
> >
> >A few 2924, 2950, 3550 switches
> >
> >A few 6500's  (enterprises image) that are in production - so I can't
> >play much with them - let say I can make changes on a specific interface
> >- but not global changes.
> > It has only ethernet ports.
> >
> >A VPN-3006, and a couple of VPN's 3002.
> >
> >A few AP-350's access points.
> >
> >Please guys ... Be creative.
> >
> >Thanks.