nicky_mckay
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Slow VPN Over ADSL
Hi. In connecting a XP Pro client over a 2048 ADSL connection to a Win 2003 file server the file transfer rates are incredibly slow (50Kbps). Is this maybe an ISP limitation or is there something I could configure to make this connection usable?
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Another method: try UltraVNC http://ultravnc.sourceforge.net/ and use it's integrated file transfer mechanism.
I admit that it is somewhat cumbersome to open a VNC session, then to open the file manage and copy the file, but it may get better network speed.
Check with your server's adminstrator if installing VNC (which would also give you access to the machine's desktop) ist appropriate. Maybe it is ?
I admit that it is somewhat cumbersome to open a VNC session, then to open the file manage and copy the file, but it may get better network speed.
Check with your server's adminstrator if installing VNC (which would also give you access to the machine's desktop) ist appropriate. Maybe it is ?
You may have a packet fragmentation issue. DSL, or more specifically PPPoE and VPN add headers to each packet. If you have not lowered your MTU then each packet will have to be broken up for transmission by your client and reassembled at the host. That takes bandwith and effort. This is described in more detail at http://en.wikipedia.org/wiki/MTU_(networking).
Your MTU can be determined by pinging your host with the -f flag (for do not fragment) and the -l flag with a number of bytes to send, eg:
ping -f -l 1500 <servername>.
With 1500 as packet size you'll see something like "Packet needs fragmentation but DF set". Now lower your packetsize with 10 at a time until you see a normal ping result. Then increase your packetsize until you see the error message again. Your maximum packet size is the last packetsize that you saw without the error. Your MTU is the maximum packet size plus 36.
Typically you can configure your VPN client software to use a lower MTU size. Cisco provides a set mtu utility for their client. Microsoft provides a step by step guide for their vpn client at http://support.microsoft.com/default.aspx?scid=kb;en-us;826159 .
Your MTU can be determined by pinging your host with the -f flag (for do not fragment) and the -l flag with a number of bytes to send, eg:
ping -f -l 1500 <servername>.
With 1500 as packet size you'll see something like "Packet needs fragmentation but DF set". Now lower your packetsize with 10 at a time until you see a normal ping result. Then increase your packetsize until you see the error message again. Your maximum packet size is the last packetsize that you saw without the error. Your MTU is the maximum packet size plus 36.
Typically you can configure your VPN client software to use a lower MTU size. Cisco provides a set mtu utility for their client. Microsoft provides a step by step guide for their vpn client at http://support.microsoft.com/default.aspx?scid=kb;en-us;826159 .
Hi,
speed slow is depend on the following
1. Your computer hardware profile .
2. If you are using firewall or proxy then use limited filters
3. If you are using internet antivirus security then its also reduce speed and bandwidth.
4. Automatic updates like critical and service pack which is run in window so stop these.
5. Cable and equipments like hub and switch check the following connections
speed slow is depend on the following
1. Your computer hardware profile .
2. If you are using firewall or proxy then use limited filters
3. If you are using internet antivirus security then its also reduce speed and bandwidth.
4. Automatic updates like critical and service pack which is run in window so stop these.
5. Cable and equipments like hub and switch check the following connections
On my VPN connections (2300 kbit ADSL) I do Windows file Transfer (Windows Share -> Network Drive) only as fallback because Windows is somewhat stupid when the latency of the connection is a little longer (longer than the usual 0.5 ms on an ethernet). Plus, Windows Network (SMB protocol) produces a lot of overhead (I think +20-50%) on the net.
Try transferring files with FTP, if you can install an FTP server on the Windows 2k3 Server.