Implementing Ehcache on distributed environment

We have a clustered environment with 4 clusters(Different machines) each having 4 different nodes. I have implemented ehCache on a single instance of server and it works fine however in a clustered environment it doest work properly.

Since the implementation is to store the cache objects on Heap. There are 4 different caches available at a particluar time. I want to rectify this problem.

Can you please suggest is there anything which can be done in just standalone.xml to configure the ehcache on clsutered environment?