inner/ outer tie rods

Okay, I’m sure one of my inner rods is gone… how do I know which one?? Left or right?? Also, I’m suspecting outer tie rods but I guess I shouldn’t touch them until I make sure the free vertical play i get in the tyre is from inner not outer rods.
I know it is inner cause I get a knocking sound when I’m cornering slowly and hitting some bumps.