DNS database ipv4 not working when ipv6 is enabled.

Fastspeed · ‎09-05-2023

Hi there

We're running an office with about 50 employees.

Both Mac and Windows PCs

Since we're using Azure AD (without Directory Service), I've created a local DNS database where I can forward fx fw-01.FQDN to 192.168.128.1 as well as switch-01.FQDN to 192.168.132.21 etc.
This works wonders - when ipv6 is not enabled.

Once ipv6 is enabled on the fortigate F80 with 7.2.5 build 1517, it stops working.

By disabling ipv6 on a device, fx a Windows machine, it works again.

I cannot for the life of me, figure out how or what I need to change/setup to make some sort of forwarding, when an ipv6 dns address is acquired.

I've attached a few screenshots of our settings, in hopes that it is sufficient information - if not, I'll provide whatever is needed.

Is someone able to point me towards the correct area where to search, what to search for, or maybe a post on the forum that I've missed?

Internal interface

vlan10

DNS

DNS server

hbac · ‎09-05-2023

Hi @Fastspeed,

Can you provide a network diagram which explain the traffic flow? It can be a limitation as there is no IPv6 options under DNS database.

Regards,

Fastspeed · ‎09-06-2023

Hi hbac
Thank you for replying.
As our setup is about to change (which I was initially unaware of) the need for resolving from a local database will no longer be needed.
As such, I'd like to cancel the request for help, but I am unsure on how to.
Br
Thomas