I have a VPN 3005 concentrator and have about 11 people that connect using the Sprint broadband PC Card. All users are running Windows XP with Service Pak 2 and are using the Windows VPN client (so PPTP). All users are complaining about very slow download of files over the VPN. Web browsing works fine, but trying to move around the intranet is a killer.
I put a 4M test file on our web site to try to test this out. When the users are connected to the internet using their Sprint card I had them download the file. When NOT connected to the VPN we are seeing 120-140K in speed. When connected to the VPN (so copying over the VPN tunnel) we are seeing speeds drop to 27K.
I could understand a minor drop due to the extra overhead but this is ridiculous. Is this PPTP and will switching to IPSEC help? Is this just always going to be the way with the PCCard connectivity? Is this only Sprint and should we get a different vendor? I can not tell what VPN part is stopping it so need a little assistance on this one.