Question : Cannot ping across Zywall to Zywall VPN tunnel

I have two Zyxel Zywall 's on DSL connections. I can create a successful VPN tunnel between the two devices but I cannot ping any device at each end. I have a Zyxel Prestige 660R as a DSL modem at one end. and a Draytek Vigor 2600 performing DSL duties at the other. Both DSL modem devices are set to no NAT. I cannot see what I am doing wrong! I need to get this fixed, and it's driving me bonkers! can any one help?

Cheers
Tanjuakio

Answer : Cannot ping across Zywall to Zywall VPN tunnel

Right, I spoke to Zyxel Tech Support, and it turned out I had a default server set up in the NAT config. Which meant that all traffic was being sent directly to that IP, weird, but there you go!

So I kinda answered my own question, what happens to the points?