Exchange Server 2016 home lab architecture

Exchange has to be installed withen the internal domain network with Active Directory (AD).
We need 3 servers totally:
- Server1: Domain controller, install AD DC, and DNS roles
- Server2: Exchange server; To install exchange server, Server2 needs to join the domain first.
- Server3: This server is gonna be in Perimeter network (DMA zone), meaning dont join it into the domain.
Server1: The DNS server setup.
- The Forwarders setup to the ISP's dns so that any queries the local DNS can not resolve will be forward to the ISP's DNS servers
- Setup Server1,2,3 with static internal IPs and the DNS pointing to Server1's IP addr as the local DNS server is installed on Server1.
Server2 - Exchange
- Join the domain then install Exchange server
Server3 - the server in DMA
- Make sure this sure does not join the domain. Install Edge Transport server here

Setup Edge Transport Server:

In the Server1's DNS server, add Server3 and it's ip address so that Server2 and Server3 can see each other.
On Server3 (Edge Transport),
- Open "Exchange Management Shell"
- Run command to create xml
  - New-EdgeSubscription -filename c:\edgeSubscription.xml
- Select Y then copy the xml file to Server2
On Server2 Exchange server,
- Open
- Run command to import xml
  - New-EdgeSubscription -FileData ([byte[]]$(Get-Content -Path "C:\edgeSubscription.xml" -Encoding Byte -ReadCount 0)) -Site "Default-First-Site-Name"
  - If not sure what is the site name, run "disite.msc" to found out.
- Run command to confirm import successful, it should show "SyncStatus: Normal"
  - Test-EdgeSynchronization
- If the SyncStatus is not Normal, or can not ping Server2, it could be the firewall blocked the inquery. Turn off the firewall.

Setup the router:

Go to Port Forwarding setup: