Performance Degradation Through VPN

[Roy Rapoport]

On Fri, 10 Aug 2001, Lee Merrill wrote:
> I think you are probably seeing the degradation due to the dialup and not
> the netscreen.  The VPN Device doesn't change its abilities based on the
> input device.  I test network latency and throughput and whenever I hear a
> customer complaining about the inability to reach the advertised throughput,
> its generally related to a configuration issue or a network bottle neck.
> And usually that bottle neck is the ISP or related services provider.
> 
> Check with netscreen on their documented throughput and latency.  I am
> willing to bet that neither the DSL nor dial up can fill the pipe that they
> are able to provide.

Apologies, Lee, I think I was unclear.

I'm not complaining about my throughput speeds on dialup as compared to the
theoretical ideal throughput speed.  What I'm saying is this:

On dialup, a straight-forward FTP transfer to a host I'm getting
4.18Kb/sec.

On dialup, going through the VPN to the same host and doing the same
operation, I'm getting 2.29Kb/sec.

So the same bandwidth constraints, other than the VPN device, and I drop
about 80% in performance.

Does this make a little more sense? 

-roy


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