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PPTP on NT Server and Network Speed

By daleyj ·
I have an NT 4.0 server running SP6a and PPTP for a VPN. My problem is response when connected to the VPN over the Internet. Is there any way to increase the network speed. The best speed I get is 9600. The remote computer connects to the Internet at speeds in excess of 48000. Any thoughts would much be appreciated.

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PPTP on NT Server and Network Speed

by Astute In reply to PPTP on NT Server and Net ...

May be this will help you

http://www.microsoft.com/ntserver/nts/downloads/archive/nt4perfup.asp

Good luck

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PPTP on NT Server and Network Speed

by daleyj In reply to PPTP on NT Server and Net ...

The question was auto-closed by TechRepublic

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PPTP on NT Server and Network Speed

by Stillatit In reply to PPTP on NT Server and Net ...

One Microsoft information root for PPTP is
http://www.microsoft.com/ntserver/commserv/default.asp

Looking at your specific question, you have to look at what is really happening. From the speeds you mention, it looks like you are on modems. Various modems report speed differently. Some tell you only the nominal line speed. Others report the speed at which the modem is accepting data from the computer. Others take into account compression.

Look at the modems on each side of the connection. It is safe to say that your connection absolutely will not be faster than whatever is supported by the slower of the two modems. (Remember that a "56K" modem can only get 53K, even on a digital line, and that most only get 33K.) Modems of differentbrands and types also may have problems linking at high speeds.

When modems link up, they negotiate the best speed they can agree on, considering standards, compression, error checking, and line noise. If you have a noisy line, this speed will not be very good. Note also that if the modems link up at one speed and they notice that the error rate is too high, they will renegotiate the connection at a lower speed automatically. (Unfortunaly they will not increase the speed if the noise goes away.)

Hope this helps.

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PPTP on NT Server and Network Speed

by daleyj In reply to PPTP on NT Server and Net ...

The question was auto-closed by TechRepublic

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PPTP on NT Server and Network Speed

by shmaltz In reply to PPTP on NT Server and Net ...

Please pay a visit to microsoft KB #Q263614, or http://support.microsoft.com/support/kb/articles/Q263/6/14.ASP?LN=EN-US&SD=gn&FR=0&qry=vpn%209600&rnk=3&src=DHCS_MSPSS_gn_SRCH&SPR=MSALL

Remove all spaces.

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PPTP on NT Server and Network Speed

by daleyj In reply to PPTP on NT Server and Net ...

Valid points but..... That doesn't explain an actual performance and port speed difference from session.

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PPTP on NT Server and Network Speed

by shmaltz In reply to PPTP on NT Server and Net ...

What it states is that your computer reports is 9600 but it is really connectiong much faster than 9600.
now the reason you see it so slow is b/c thats how VPN works over dialup IT IS VERY SLOW even if its 56k it is still very slow.
if you want your user to still use the VPN over dial up and it should not be slow, install a terminal server and use the terminal server services for all network stuff its fast even over a real 9600 connection.
I had the exact same problem until i decided there is no solution with VPN alone so I also installed a terminal server now all remote users after they logon to the netwrok have to log on to the terminal server.

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PPTP on NT Server and Network Speed

by daleyj In reply to PPTP on NT Server and Net ...

The question was auto-closed by TechRepublic

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PPTP on NT Server and Network Speed

by jvohs In reply to PPTP on NT Server and Net ...

First of all the speed-o-meter is broken. One also must take into account the overhead of PPTP on a protocol basis. PPTP is encrypted and encapsulated. When the packet is put together on the sending machine, first it creates a regular (almost) IPpacket, destined to the remote internal network or VPN connection. This packet, almost normal meaning that it has significantly less payload, is then encrypted, and finally encapsulated in a second IP packet which is sent to the public (Internet) address. The receiving computer must then perform the reverse process. This is a fairly intense process, thus there is a major performance hit especially on phone line VPN's. The speedo is broken though and I do not know the true speed. It's all determined by processor, NIC etc... Many businesses use hardware based VPN's for LAN-WAN connections. The speed is better on a cable or DSL connection, but still fairly resource intensive.

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PPTP on NT Server and Network Speed

by daleyj In reply to PPTP on NT Server and Net ...

The question was auto-closed by TechRepublic

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