Network testing and latency

[Kevin D. Clark]

Ben Scott writes:

> On 3/7/06, Kevin D. Clark <kclark at mtghouse.com> wrote:
>> If all that you want to do is to introduce latency, I would suggest
>> using iptables "dstlimit" and "fuzzy" modules.
>
>   Will that really create a realistic reproduction of a higher latency
> link, though?  

It depends on what you mean by realistic.  Those things are basically
a very granular knob that you can turn to affect certain things.

> Assuming the throughput demands were minimal, 

I wasn't making any assumptions here.

> latency
> would remain low, wouldn't it?  And higher throughput demands would
> prolly result in TCP throttling or retransmissions or some such, which
> would be seen more as a bandwidth limit or bad line, not long
> transmission time, per se.

I wasn't assuming TCP or any sort of protocol that does congestion
control either.  In fact most of my experiences in this space are with
protocols that don't do congestion control.

Anyways, davej already offered a better solution.

Regards,

--kevin
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