Configure Google Fiber static IP s on FortiGate 80F

[Technigogo]

The client had a single IP from Google Fiber before my company took over support. We installed an 80F, and the "static" is issued by DHCP from Google Fiber on the WAN interface. We have upgraded their Google Fiber account to add 5 static IPs. The statics are in a different subnet. 

I am unsure what to do. Very important - if I create VLAN(s) for the static IP(s), what will change for the static IP issued by DHCP over the WAN? All traffic is currently using that DHCP static IP, including VPN. Will that render that IP unusable since it becomes a gateway for the block of static IPs?

If the statics require VLAN, what interface? the main LAN or the WAN? What is the Role that I select: LAN? WAN? DMZ? Undefined?

Can this be done with VIPs or IP Pools? If IP Pools, what type do I use? One-to-One, Fixed-Port Range, or something else?

Here is Google's depiction of the necessary layout for using static IPs.

[Technigogo]

Toshi, your patience is impressive. Thank you.

I want to put this more into layman's terms for anyone facing the Google Fiber Static IPs. In short, it is MUCH simpler than you think!

Set your WAN interface to DHCP per Google instructions. All you have to do for the block of Static IPs is add them to the IP Pools. As Toshi pointed out, you can use the entire block. Once they are there, you can use them in VIPs.

[Toshi_Esumi]

It's not only for Google Fiber, but also for virtually any ISPs who offer static IPs with a /30 interface subnet + a /29 or /28 or more additional subnets, you can do the same.

Toshi

[sw2090]

To be exact:

you can only use 6 out of 8 ips of a /29 because first ip is the network address and the last is the broadcast addess. These cannot be assigned to devices/interfaces of course.