1 minute ago, Undeadguy said:Really the only way to prevent those squad attacks would be to kill them first or engaged in close quarters.
It looks to me like range 1 is roughly 6 inches, so units of infantry loosely deployed around an AT-ST could prevent your opponent from getting close enough without being forced to charge your infantry, as range is measured from the Squad leader to the closest model in the unit. Snowtroopers with their flamethrower might be ideal for this purpose, as if the opponent gets close enough to grenade the AT-ST, then they are more than likely in flamethrower range.
Honestly, we'll see how it shakes out once the game is released, some of this depends on rules interactions and the actual scenarios we will see in gameplay.