PPTP VPN doesn't work if OpenVPN client has been active

[cthart]

Hi,

I've flashed and started using two Netgear WNDR3700v1s running Gargoyle 1.5.8 (previously running DD-WRT).

The main reason for switching from DD-WRT was to setup a router-to-router VPN between home and office. This was very easy to get working using OpenVPN and the documentation provided here.

My "home" router (local subnet is 192.168.1.0/24) is setup as the OpenVPN server. The "office" router is setup (local subnet is 192.168.2.1/24) as the OpenVPN client.

However

At my office I work with a PPTP VPN to a cloud-based development environment. If the OpenVPN client there is active I cannot get the PPTP VPN to setup (from a Windows Server 2003 R2 machine), it hangs on "Verifying username and password..." Even if the OpenVPN client has been active but subsequently disabled the PPTP VPN connection will fail at the same point.

Only if the OpenVPN client is disabled and hasn't been enabled at all since booting the router does the PPTP VPN work.

Initially I thought it might be some strange routing thing with the OpenVPN using the default addresses of 10.8.0.2 and 10.8.0.3 internally (as the PPTP VPN uses and routes 10.1.0.0/16 addresses). However changing it to use 192.168.0.2 and 192.168.0.3 internally made no difference.

What's going on? Is this a known issue?

If there's any other info you need, just ask.

Thanks,

Colin

[cthart]

Anyone? Should I post this in a different forum?

Is this a GRE issue maybe?