Is it possible to go from Kathmandu to Lhasa by foot?

I am afraid the Government of China is pretty wierded out about Tibet and walking across the boarder is not permitted. There is a special visa just for Tibet seperate from your China visa. The visa allows you to go to Tibet only on group tours. You can go with a group then wonder off on our own but you must go with them across the boarder. You must either fly in from Chengdu or take the train. For some reason it is illegal for foreigners to go by raod to Tibet from inside China. From Kathmandu you can fly in for sure. Possibly take a bus. If that's true then take the bus from the closest point to the Chinese boarder to the closest point on the other side. You'll not be able to walk that part, but you would still be walking a hell of a long way.