How to JOIN DOMAIN AND LOGIN OVER A SpeedFusion VPN

Hi
SHORT: How to allow computers that work in remote branches and are connected with SpeedFusion VPN to remain connected to the domain in the main branch?

In Details:
The company where I work has 16 remote branches,
The main branch has a Peplink Balance 710
The other branches have Balance 305v2, MAX-BR1-AEv2, BPL-ONEv1, MAX-BR1-AEv2
Our DC server is in the main branch, all branches are connected with SpeedFusion VPN
The main branch is under 172.27.0.0/16 the DNS/DHCP is the DC server=172.27.10.20
The other branches are connected under 172.28.x.1-200 the Assign DNS server automatically on LAN is enable
What do I need to do so that the computers in the branches are connected to the domain? without using the “Send All Traffic To 172.27.10.20”

I would greatly appreciate any help

At the remote branches, set the DNS server in your DHCP at each branch to 172.27.10.20. Then they’ll use your central DC and be able to use the domain.

OR

If you want to be more fine-grained so that only AD-related DNS lookups are done over SpeedFusion: on each branches Network page, click the ? on DNS Proxy Settings and use the 2 links in the tool tip to activate the 2 advanced options sections.

Under Domain Lookup Policy, enter your AD domain name like “contoso.local”, then select your SpeedFusion back to your main branch.

Under DNS Resolvers, check the box for your SpeedFusion to your main branch, and enter 172.27.10.20 there.

Save and apply.

Here is a screenshot of about how it should look:

These settings work perfectly
Thank you Very much Noah Helterbrand

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