Forwarding in home network DM7080

In my internal home network I have noticed that it is impossible to make connection between my DM7080 and DM8000 etc. Eg from DM8000 to DM7080 working fine, but not in the opposite direction. It is same strange situation with my Vu+Duo2 as with DM7080.

Anybody who can explain why and may be give me a hint how to solve this problem?

Sorry for my mistake. Still hope that somebody can give me info that may solve my problem.

Ok guys, I solved the problem. Easy, I was blind and hd mixed e few things. Sorry for making trouble.