Hi,
> RRAS is already configured on the server, with Remote Router interface (on-demand PPPoE connection).
> Everything works fine: lan clients have access to internet through the server
On the physical Hyper-V host server, its no need to configure RRAS for internet connection, since the server can connect to internet through the ADSL NIC connection. While, for guest VMs in the Hyper-V host, you can configure RRAS as a LAN and WAN router
establish internet connection. So if the RRAS configured correct, the guest VMs should have internet connection.
Check your RRAS settings or refer to following articles to configure RRAS:
Enable RRAS as a LAN and WAN Router
http://technet.microsoft.com/en-us/library/dd458974.aspx
How to Use Static Routes with Routing and Remote Access Service
http://support.microsoft.com/kb/178993
Also you may try following workaround:
Remove RRAS in Hyper-V host server, since you have already configured External virtual network switch, you can find a virtual External network adapter on the Hyper-V host (the NIC connect to Lan). Create a network bridge between the virtual network adapter
and the ADSL NIC. Assign proper Lan IP address for your guest VMs and these VMs will have internet connection.
For more information please refer to following MS articles:
Bringing Hyper-V to Windows 8
http://blogs.msdn.com/b/b8/archive/2011/09/07/bringing-hyper-v-to-windows-8.aspx
Hope this helps!
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