I have an IPsec VPN tunnel between a FortiGate and VPN gateway. The Tunnel works fine and is pingable. The DNS is on the remote site. I can ping the IP addresses of the DNS server but the DNS resolution is not working over IPSec tunnel. I have looked this problem up and found that I must perhaps define a domain in my IPSec phase1-parameters through CLI. HOwever set domain command is not available on my fortigate CLI. I have tried to set mode-cfg but still no luck. Cloud you please let me know how can I set domain in phase parameters or perhaps another possible solution to this DNS resolution problem. ?
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