Cookie未在IFrame中发回域

I have an application running on 192.168.1.100. This application serves a page in which an iframe is embedded which is basically another application running on totally different ip e.g. 10.0.0.1.

The issue is whenever user performs a login inside iframe a cookie is set but it is not sent back to 10.0.0.1 for subsequent requests.

What i am trying to achieve is this even possible?

Any help in this regard is appreciated.