Re: fortigate - forward all network traffic through specific dns server
Create a VIP which redirects (destination NAT) your ISP's DNS address to quad9.
external address: 220.127.116.11 (your ISP's DNS)
no port forwarding.
Then, create a policy
src addr LAN/24
dest addr: this_VIP
and query with "nslookup" from a host.
I use this to reduce NTP queries by redirecting them to the FGT LAN interface, and using the FGT as NTP server. Sometimes this is easier than walk around and change so many devices...
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