we also have problems setting up a pptp/gre tunner over the astaro box (7.104):
We have a win-client on the internal net that wants to connect to an external vpn-box with a static IP. At the external interface a multihome router is connected to serve the two internet connections, so the multihome router is doing the NAT, not the astaro. We enabled the GRE and PPTP services from all internal networks to the external ip address of the vpn-router.
Looking with "tcpdump -i ethx" on the external interface it looks like no GRE packet is coming back from the vpn-router.
