VPN Speed


E

ErDNA

I'm using Windows Server 2003 as the VPN server in my
office. When the VPN connection is active, I can view that
only 28Kbps for the VPN connection. (Both of the local and
remote site is 1.5Mbps download/ 256Kbps upload ADSL.
How can I speed it up??
Thanks
 
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R

Robert Schlabbach

ErDNA said:
I'm using Windows Server 2003 as the VPN server in my
office. When the VPN connection is active, I can view that
only 28Kbps for the VPN connection. (Both of the local and
remote site is 1.5Mbps download/ 256Kbps upload ADSL.
How can I speed it up??
Are you sure you got the figures right? Do you really get 28 kiloBITS per
second, or do you possibly get 28 kiloBYTES per second? In the latter case,
the only way to speed it up is to upgrade your ADSL service, because the
limiting factor is the 256kbps upload, as 256kbps = 256000 BITS per second
= 32000 BYTES per second. Minus ADSL and ATM overheads, 28 kiloBYTES per
second is the maximum you could expect.

Regards,«
 
?

???

I checked the "task manager", in the "Networking" tab, it shows the
connection is 28Kbps (Kilobit per second)
 
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C

Carl DaVault [MSFT]

Actually, don't worry about the 28k number... it's a hardcoded string that
shows up in the taskmanager UI because RAS can't figure out the speed of the
port - the reason is this:

You're looking at the speed of the "internal" or "RAS Server (dial-in)"
interface - this is not really connected to any specific media - the RAS
server could be processing 1200-baud modem calls or VPN calls over a gigabit
ethernet link (or both at the same time).

You should check perfmon counters or use netmon to measure actual
throughput. If you are running a dedicated VPN server, you can measure
traffic on your LAN interfaces and come up with an approximate throughput
number.

1.5Mbps is most likely a light load for your VPN server (depending on your
hardware, of course) and you should be able to process packets as fast as
your DSL connection can handle them.

So while it's probably really faster than 28k, the other posters are right -
to make it faster, get a faster internet link - it will be your limiting
factor. 28kB/s instead of 28kb/s sounds reasonable as a maximum for your
link.

On a side note - if you are running older hardware (below the minimum
recommended) and are pumping over 10Mbps you may want to turn off PPP
compression if task manager is indicating high CPU usage.
 

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