LAN Link not connecting

Hi all, probably a stupid question as I'm just starting to work out the new features as I have been away from DJing for bit - last ones I used were the 1000 MK3 lol

When I put a LAN cable between my CDJ2000 and CDJ900 ( I was told that should work right away?) there is no link connection..Am I missing something or doing something wrong?

All help very much appreciated!