Ok, maybe I write it not clear. I use time machine on Asus AC88U with external hard drive and VPN also on the router. When I'm in home I can find backup disk without a problem (over the net) but when I connect over VPN (form office or other location) my Mac can't find the disk in network and time machine don't work.
Over VPN I get IP in 10.10.10.0 and my LAN is in 192.168.4.0 subnet.
This same with DLNA, when I start VPN I can't find DLNA server (running on an Asus router also)