AT&T Business Fiber + 5 static IP addresses in a different subnet.

Hello,

We have AT&T business fiber and paid for additional IP addresses. Usually we get all IPs in the same subnet but with AT&T, our primary static address is completely different than our 5 static IPs. I haven't seen this before and wasn't sure how they are supposed to be used.

• There is an AT&T multi-tenant box in the MPOE (Ciena) which both our suite and another suite in the building connect to.
• We have a CAT5e hand off running from that to our Fortigate Router/Firewall
• We've just been using the primary static address so far.

My guess is we would set up those static IPs on other interfaces on the router/firewall and then config our router/firewall to route traffic from those 5 ips all through the primary static IP we were issued using Rules etc.

Is this correct? Why not just give us the IPs all in the same subnet?

Edit: I tried searching "AT&T fiber static subnet" before posting