in laymans term, its simply a longnet, anything between 25yds to 100yds long, that is placed around the warren, in whatever shape is neccessary, therefore boxing in all the holes, the ferrets are then entered to do their work of bolting the rabbits out into the net, sometimes if its a large warren, the box can be subdivided again with more longnets, or purse nets can still be put down, as some rabbits will try bolting from one hole, to dissapear down another, within the net
longnetting allows you to ferret in areas where it may be tricky getting to the holes, around a bramble bush for exam