There is:
- Debian Guest 9
- Host Windows 10 LTSB VBox 5.2.16r
A virtual access point (hostednetwork) network is running on the host and ICS service is disabled. Guest bridge is forwarded to this network to act as a gateway, dhcp, dns.
When connecting to the network, the smartphone receives an ip-address without any problems and communicates with the guest OS, i.e. all pings pass, all dns requests work, everything works if you directly access the gateway or its services.
The problem lies in the distribution of the Internet (NAT), forward packets from the smartphone do not reach the gateway (guest OS). Checked with wireshark and tcpdump.
Oddly enough, this bundle worked without problems on windows 10 single language. I suppose some process or windows itself catches all the forward packets before the guest, I have not been able to determine what is stopping for a week.
What could be the problem? 
