Bandwidth settings for VPN connections?

[Mick S.]

Is the bandwidth for each VPN connection limited to a
maximum of about 130 kbps? The server is connected to
the internet through a cable modem. The connection gets
7 Mbps downstream and 1 Mbps upstream. I have the same
cable internet at home (Optimum Online) and when I
transfer data in either direction it seems to stay at
about 130 Kbps. I have 3 computers on my network at home
and if I setup a VPN session on each of them at the same
time, they will all get about 130 kbps transfer
simultaneously. Obviously the connection is not limited
to 130 Kbps, so I assume that routing and remote access
on the server throttles each VPN connection. Is this
correct and can I adjust the bandwidth for each
connection. There will never be any more than 3 VPN
connections at a time.

 

[Carl DaVault [MSFT]]

You might be limited by the speed of whatever application is testing the
speed or by the latency of the internet (use tracert to check latency).

For example, if you are transferring data over a socket connection, does
using multiple sockets improve performance?

There's nothing in the VPN server that throttles connection speeds. If you
expose the bandwidth test application directly on the VPN server, instead of
accessing it thru the VPN server, how much of a speed increase do you see?
(Such a measurement would rule out latency on the internet being a factor.)

 

[David Hilderbrand]

I'm having the same issue. The Server is on a Cable
connection and I connected from a DSL connection. I was
able to copy files, but the speed was very slow. When
transfering using PC Anywhere it is much faster. Some of
our sites will be connecting from a Dial Up connection
which is even slower.

Thanks, Dave

 

[Robert Schlabbach]

I'm having the same issue. The Server is on a Cable
connection and I connected from a DSL connection. I was
able to copy files, but the speed was very slow. When
transfering using PC Anywhere it is much faster. Some of
our sites will be connecting from a Dial Up connection
which is even slower.

What protocol did you use to transfer the files? Note that Microsoft's
"file and printer sharing" (aka SMB) has proven to be unfit for
high-latency connections (high-latency being anything outside a LAN).

Try transferring your files with more advanced protocols like FTP or HTTP.
You can tweak your TCP window size to improve the speed of FTP and HTTP
transfers if you haven't already done so.

Regards,«