DNS over IPSEC tunnel - issue setting domain suffix

so obviously I am an idiot cause I cannot get this to work.

I want to be able to ping via dns name across the ipsec tunnel, but it will not work, even though I have my local DNS set.

so google tells me I need to set the domain suffix, but I cant make it work, can someone tell me what I am doing wrong?

remote90d # config vpn ipsec phase1-interface

remote90d (phase1-interface) # show config vpn ipsec phase1-interface edit "vpntocorporate" set interface "wan1" set comments "VPN: vpntocorporate (Created by VPN wizard)" set wizard-type static-fortigate set remote-gw xxx.xxx.xxx.xxx set psksecret ********* next end

remote90d (phase1-interface) # edit vpntocorporate

remote90d (vpntocorporate) # set domain mydomain.com

command parse error before 'domain' Command fail. Return code -61

remote90d (vpntocorporate) #