UPDATE: Router error logs show:
LCP Time-out 0
I'm not sure how to correct this. The Lan-to-Lan profiles are set to -1 Idle Timeout (for the remote branch).
I have a PPTP VPN running between two Draytek 2820 routers. They are setup that one dials out to the other one.
Main Practice - 192.168.1.0/24
Branch - 192.168.3.0/24
I have then set (on the Branch) router the following route:
192.168.1.0/24
If I then request a server running on 192.168.1.1 from the Branch, it correctly routes through VPN tunnel. If I request the branch server at 192.168.3.1 it correctly routes to the local server without using the VPN tunnel.
I have temporarily disabled the firewall on both routers, and made sure that QoS is disabled.
The Main Practice internet connection is ~30mb down / ~10mb up, and the Branch connection is ~5mb down / ~2mb up.
Anything over the VPN tunnel runs pretty slowly (VNC, Remote Desktop and Terminal Emulators). However, if I dial using the Windows VPN wizard, creating a connection from the laptop to the Main Practice – everything runs quickly.
I'm looking for possible causes, and/or ways of further diagnosing the issue. Any help would be greatly appreciated!
UPDATE: In summary, when I connect within the Branch and try and access a host that's within the Main Practice it works, but slowly. If I then dial the VPN on my Windows 7 laptop whilst still connected to the Branch network, it's fast.
Main Practice
Branch Practice
Routing Table from Branch Router
Key: C - connected, S - static, R - RIP, * - default, ~ - private
* 0.0.0.0/ 0.0.0.0 via 126.256.126.103 WAN2
C~ 192.168.1.99/ 255.255.255.255 directly connected VPN-1
S~ 192.168.1.0/ 255.255.255.0 via 192.168.1.99 VPN-1
S~ 192.168.2.0/ 255.255.255.0 via 192.168.1.99 VPN-1
C~ 192.168.3.0/ 255.255.255.0 directly connected LAN2
C 126.256.126.103/ 255.255.255.224 directly connected WAN2
Routing Table from Main Practice
Key: C - connected, S - static, R - RIP, * - default, ~ - private
* 0.0.0.0/ 0.0.0.0 via 81.139.64.1, WAN2
S 81.137.176.1/ 255.255.255.255 via 81.137.176.1, WAN2
* 81.139.64.1/ 255.255.255.255 via 81.139.64.1, WAN2
C~ 192.168.1.204/ 255.255.255.255 is directly connected, VPN
C~ 192.168.1.0/ 255.255.255.0 is directly connected, LAN
S~ 192.168.2.0/ 255.255.255.0 via 192.168.1.204, VPN
S~ 192.168.3.0/ 255.255.255.0 via 192.168.1.203, VPN
Connection Details (from Branch Router)
Connection Details (from Main Practice Router)
IPERF.exe Output
If it helps, here is the output from the IPERF.exe server
Best Answer
Your VPN connection uses MPPE encryption, but according to router's page http://www.draytek.co.uk/products/vigor2830.html - MPPE have no hardware support. Try to setup something else as encryption protocol (AES/DES/3DES). IMHO it is available only with L2TP protocol.