Hi,

I have a problem with a slow (and I mean incredibly slow) LAN to LAN PPTP VPN: The VPN setup is below, but a quick bit of information first:

One office in Newcastle upon Tyne, one in Geneva
8Mbps synchronous internet connection in Newcastle (not doing anything else - it's a new line)
10Mbps synchronous internet connection in Geneva (not doing anything else - it's a new line)
DrayTek 2920 at each end (both with firmware v3.3.6)

The VPN comes up OK, I can see devices in Newcastle from Geneva and vice versa, and pinging between the sites gives an OK result (about 30-40ms on average). However, the peak rate I can get for data transfer is about 35Kbps (yes, 35,000 Bps). I thought it could be processor speed on the Draytek, but the really odd thing is that if I make a VPN connection directly from a PC to either Draytek (obviously from an offsite network, a 20Mpbs cable connection) I can get it to transfer a file at about 6-7Mbps, which is about what I'd expect.

EDIT: Creating an IPSec VPN improved things, but ony to 150Kbps

Any help very gratefully received as this is due to go live fairly soon. Thanks

VPN setup:


NCL Out

Call direction: Out
Always on
Netbios naming packet: pass
Multicast via VPN: Block

Dial out settings:

Type of server I am calling: pptp
Server IP: xxx.xxx.xxx.xxx
Username: xxx
Password: xxx
PPP Authentication: PAP/CHAP
VJ compression: on

TCP/IP Network Settings:

My WAN IP: 0.0.0.0
Remote Gateway IP: 0.0.0.0
Remote network IP: 172.18.0.0
Remote Network Mask: 255.255.0.0
Local Network IP: 172.17.0.0
Local Network Mask: 255.255.0.0
RIP Direction: Diasable
From first subnet to remote network, you have to do: Route


GVA In

Call direction: In
Always on
Netbios naming packet: pass
Multicast via VPN: Block

Dial in settings:

Allowed dial-in type: pptp
Username: xxx
Password: xxx
VJ compression: on

TCP/IP Network Settings:

My WAN IP: 0.0.0.0
Remote Gateway IP: 0.0.0.0
Remote network IP: 172.17.0.0
Remote Network Mask: 255.255.0.0
Local Network IP: 172.18.0.0
Local Network Mask: 255.255.0.0
RIP Direction: Diasable
From first subnet to remote network, you have to do: Route

Did you ever manage to find the cause of this as I'm having an issue with slow lan-to-lan vpn.

Thanks

Kevin

I had a problem like this, when one of the sites was connected using a high speed wirelss connection. It even gets worse if you have a sattelite for your internet.
If your sites are distant, maybe the latency will also impact the speed even if traditional wires are used.

technical reason:
read here:
http://sascomnet.com/pop_sat_vpnspec.htm