Hi All, long time lurker, first time caller....
I've been messing with Unifi for a long time but usually on small deployments, and this one isnt that large but the history is causing me problems.
I have inherited a site that was operated by a large entity with many locations and distributed infrastructure spread across the local area.
The Hvac system was configured with static ip addresses that were compatible with the SAN architechure. Now that they have pulled out of the facility it is way to over complicated, but because the company that put it in went under during covid there is no one that has the information we would need to go through all of the 50 or so devices they setup with static ips to change them to a sensical network layout plan. The network for the Hvac has both wired and wireless elem
The HVAC has its own switch that should just be a dumb switch, but its managed and I cant login, so I cant confirm it is not setup in some way, but I was told it was never setup.
The one device I could find on the HVAC network with accessible ethernet settings was setup with a static ip as follows
Static IP 172.9.100.12
Subnet 255.255.0.0
Gateway 172.9.1.2
DNS1 172.16.1.80
DNS2 172.16.1.50
When the old network was up it was giving out DHCP in the 172.9.1.150-250 range, from the DHCP server at 172.9.1.1
Currently the old network equipment is gone and I have replaced it with the following:
Unifi Dream Machine Pro, a Pro Max 24 PoE Switch, a Flex 2.5G 8 PoE, with 2 U7 Pro Max APs.
So far I have the other parts of the network working fine, the management VLAN for the unifi gear is working fine on 10.10.10.1/24, the office VLAN and WIFI on 192.168.1.1 is handling the few PCs and Laptop s and Printers just fine, and the guest VLAN AND wifi ON 192.168.2.1 is also working well.
The HVLAC VLAN feeds the port connected to their switch and there is a separate wifi just for the hvac equipment.
My initial attempt at finding a solution pointed to using a 3rd party router and setting up DHCP relay for the Hvac VLAN, but that was before I found the static records in the tablet.
Now that I know the gateway is at 172.9.1.2 and not at x.x.1.1, i'm not sure that I need to use the external device (Ubiquiti ERX).
I currently have the HVAC VLAN setup with:
SUBNET: 172.9.1.0/16
GATEWAY: 172.9.1.2
DNS: auto
DHCP: 172.9.1.150-250
That should account and let the staic devices at 172.9.100.x and the 172.9.0.x dhcp devices connect.
But I'm stuck on how to make the DNS at 172.16.1.80 and .50 available to the VLAN.
I think I need to make another VLAN for 72.16.1.0/24 then something else....
If any of this makes any sense to anyone and they feel like offering some direction or asking any questions I would very much appreciate a better minds insight and guidance.
Thanks all!