>>1680421>>1680442I've spent a bit of time in Canberra and a lot of time in Namadgi national park. Just get in your car and drive out there and take a dirt track until you get to a camp ground. There were heaps out there last time I was there.
Here's a map I found, there are 3 here but I remember finding a lot of unmarked campsites out there. I have only camped at Mount Clear Campground.
I would definitely recommend Yankee Hat trail, that was a good one I remember doing. Also Square rock.