I have a VPN tunnel setup between two Linksys WRV54G routers. The connection using the VPN works fine and I am able to get my data the way I should be able to. The problem is a lot of the time my internet speed drops off to around 125K but then goes back up to 3megs a few minutes later then go back down. I know the problem is with the VPN b/c if I disable the VPN setting I have NO problems with internet speed at all. I have tried to change the MTUs and it defiantly has nothing to do with that, I have tried EVERY number you can think of. I have just the VPN tunnel setup no VPN client.
These are my VPN Tunnel settings.
IPSec Pass-through: Enabled
PPTP Pass through: Enabled
L2TP pass-through: Disabled (also tried it enabled)
IP Range of Local secure group:
IP Range of Remote Secure Group:
Remote Secure Gateway : External IP address of other location
Key Exchange Method: Auto (IKE)
Pre-Shared Key: (Matches other location)
Key Lifetime: 28000
Advanced VPN Tunnel Setup:
Operation Mode: Main
Lifetime Key: 3600
Key lifetime: 28000
If IKE failed more than 5 times block for 60 s