Thank You Sir!
I just added:
route add -net 10.20.0.0 netmask 255.255.0.0 dev tun0
This is the only part of the network I care about... (AS400 and My Desktop are ont his network..)
It added an entry with 0.0.0.0 as the gateway....
I am suprised it wouldn't work before this as 10.0.0.0 netmask 255.0.0.0 was added to my routing table by OpenVNC but the difference was th 10.0.0.0 was pointing to OpenVNCs IP as the gateway..
Unless drilling down to 10.20 makes darn sure that my own network between the BB and myself doesn't try routing it on it's own..