I got it to login and join network, but N900 appears as unreachable in my desktop hamachi.

And I can not ping nor remote desktop to other machines on same network. But hamachi on N900 sees them and gets their nick-s also.

There is route to 5.0.0.0 but without gateway on interface ham0.
And my default gprs route is also without gateway.

But OpenVPN creates routes with gateways and works just fine over gprs data.