Please give advice on VPN performance...

[Alan Kamrowski II]

Please give advice on VPN performance. We currently have two offices
connected by a leased 64k line and average 52kbps without a little
compression and 425kbps with compression.

What I am trying to determine is whether a 384/1536 ADSL or T1 lines at both
offices running to an ISP and using a VPN to connect them would compare to
my 52kbps/425kbps performance now with the 64k line.

If anyone out there is running a VPN over ADSL or T1 and would run a
performance test for me I would really appreciate it!

You can also run TTCP on the router at the enabled prompt (in some IOS
versions) by typing "TTCP".

You can download the Windows based TTCP utility wsttcp from...
http://www.pcausa.com/Utilities/pcattcp.htm

Thanks,

Alan

[Alan Kamrowski II]

Dave,

> It stands to reason that a faster ckt would move the data faster. VPN
doesn't slow your traffic.
> What slows down your traffic is the processor speed and whether it is
software or hardware doing
>the encryption.
I see.

> As a side note, I'm amazed you are seeing an 800% increase with
compression. Are you just
> transferring text files? Try transferring a zip file or something & test
it.
The test was done with the TTCP utility wsttcp for windows. The fast speeds
were just a regular test, I let the utility use some sort of pattern for its
data. I realized that obviously the numbers showed a great improvement due
to the compression so I fed the utility an already compressed stream of data
to figure out what the speed would be if the data was not compressable.

> Also keep in mind that if you have the ADSL at both ends, your VPN traffic
rate will never exceed
> 384kbps, where the T1 will always provide 1.536 Mbps (give or take a few
internet allowances in
> either case).
I got you.

Thanks,

Alan

[Dave Phelps]

It stands to reason that a faster ckt would move the data faster. VPN doesn't slow your traffic.
What slows down your traffic is the processor speed and whether it is software or hardware doing the
encryption.

As a side note, I'm amazed you are seeing an 800% increase with compression. Are you just

transferring text files? Try transferring a zip file or something & test it.

Also keep in mind that if you have the ADSL at both ends, your VPN traffic rate will never exceed

384kbps, where the T1 will always provide 1.536 Mbps (give or take a few internet allowances in
either case).

Dave Phelps
Phone Masters Ltd.
tippe...@nospam.com
nospam=bigfoot