L2TP/IPSec VPN with Internal DNS

[dmatrix7]

Is there anyway to get internal DNS to work with a L2TP/IPSec VPN? If I enable mode config and supply my internal DNS servers then the VPN never connects. Is there any other way to accomplish this such as DHCP over IPSec?

Any options would be appreciated as if not then I will have to use Forticlient for Windows VPN users, which I would rather avoid and be able to use native VPN clients.

[oheigl]

You could try the explanation here: http://cookbook.fortinet.com/ipsec-vpn-external-dhcp-service/

But instead of relay use server in the interface configuration. I'm not sure if it works with L2TP/IPsec, because you also define a L2TP pool - if it doesn't, maybe give IKEv2 a shot and try it with that