Slow File copy over Remote Desktop

[jogisrinivasu]

We have an issue with regard the to the bandwidth we are able to realize on an FTP connection between our Hyderabad/India office a client location in the USA. We are using Cisco VPN connection between the two locations. We have a 10 Mbps (10 mega bits per second) connection, but when we transfer files between the locations, we are never able to get more than 40 KBps (40 kilo bytes per second – or 320 kilo bits per second or 0.32 mega bits per second), even when no other machine on our network is active.

We have already checked our firewalls, switches and updated the VPN software. We have also tried to switch to a different TCP port. We also tried to increase the MUX packet size to 1500 on the Windows. Nothing is working, even when we have one machine directly connected to the 10 Mbps link, and we are not able to realize 0.32 Mbps for the file transfer. However, we see that higher bandwidth is available for other ports/services (like HTTP), we are able to realize better bandwidth, up to 250 KBps.

How to solve this issue of slow file copy over RDP?

Thanks in Advance.

Vasu

[Marcin Latosiewicz]

Vasu,

First of all you need to understand where the slowness comes from - after that move towards a possible solution.

Changing MTU to maximum is probably going to make things worse if the problem is fragmentation.

Typical problems for TCP transfers:

- packet drops (retransmission, DUP ACKs in wireshark)

- fragmentation

- Out of order packets

- Proxy/filtering/acceleration

(Not neccessarily in that order)

Run s sniffer trace on the machine while running the test. Have a look which one(s) you face.

Marcin

[cciesec2011]

- What is the latency between the two sites?

- The best way to troubleshoot this issue is to use "iperf".  That's way you can adjust the MTU size and control how much traffics you want to send.

[jogisrinivasu]

Thanks for the reply.  The latency between the two sites is 260.

We have an issue with regard the to the bandwidth we are able to realize on an FTP as well as RDP between our Hyderabad/India office a client location in the USA. We are using Cisco anyconnect VPN client 2.4  connection between the two locations. We have a 10 Mbps (10 mega bits per second) connection, but when we transfer files between the locations over RDP and FTP, we are never able to get more than 40 KBps (40 kilo bytes per second – or 320 kilo bits per second or 0.32 mega bits per second), even when no other machine on our network is active.

We have already checked our firewalls, switches and updated the VPN software. We have also tried to switch to a different TCP port. We also tried to increase the MUX packet size to 1500 on the Windows. Nothing is working, even when we have one machine directly connected to the 10 Mbps link, and we are not able to realize 0.32 Mbps for the file transfer. However, we see that higher bandwidth is available for other ports/services (like HTTP),

we are able to realize better bandwidth, up to 250 KBps

There is no difference when copying to a mapped drive vs an UNC path over RDP. we are using Windows Xp / 7 OSs. The server os is 2003. We are suspecting that Cisco VPN is blcoking full speed

Please help us in achieve more speed both on FTP as well as file copy over RDP.

Thanks in advance.

Srinivasu