Host file for nic link

[ToastyStoemp]

Hey all,

I have one synology server that I'm using as a NAS. ( This also runs a VPN )
All my media is stored on the NAS.

I have a second server running Unraid, running plex of course.
Both are connected to the router but also using an additional nic to each other ( eth1 )

When media is being pulled from the NAS this happens over the eth1 connection.
As desired.

However if someone is connected to the VPN and streams plex, the data goes from the NAS to Unraid ( over eth1 ) then over the router back to the NAS to be send over the VPN connection.
Preferably I'd also want this 'return' stream to go over the eth1 connection.

I tried setting up my host file for unraid as next: 
169.254.114.250   192.168.3.101
eth1 ip                network ip NAS

To no avail. Would love some aid in this network setup.
-Wolf


ps. Yes I understand that just hosting the VPN on the unraid would be an easier solution. But that's not possible at the moment.