Fortinet is checking into a way for the other web server to work IPv6. You can setup an IPv4 VIP from URL to IP. They are checking on doing it with IPv6.
I have decided to create an entire blog page dedicated to IPv6. This site is on a server that is configured for IPv6. After a year of working on IPv6 with Fortinet from AT&T. I finally abandoned AT&T and switched to Comcast.
Comcast brought me down all 8 interfaces and both WIFI interfaces the Prefix-Delegated Subnets for IPv6. I made the other changes to the firewall and IPv6 has /64 addresses on every interface and can route in and out.
EUI-64 addressing for devices
IPV6 Address is
AAAA:BBBB:CCCC:DDDD:EEEE:FFFF:GGGG:HHHH
AAAA:BBBB:CCCC:DDDD is the the first 64-bit of the 128-bit and never changes from your ISP. EEEE:FFFF:GGGG:HHHH is the 64-bit for your internal network or the /64
Your devices MAC address is what creates the automatic EUI-64 address. Here is my old AT&T /64 block address: 2600:1702:980:25e0. Here is the MAC address of a NIC: 00-D8-61-F4-A9-23. You take your MAC and spit it in half and add FF:FE to the middle 00DB:61FF:FEF4:A923. Your computer will create a IPv6 address: 2600:1702:980:25e0:00DB:61FF:FEF4:A923
You just joined Comcast and they gave you a shiny new /61 block. What to do?
Your WAN side will have your public NA address. They will give you PD address and tell you /60 or /61. /60 = 16 x /64 blocks. /61 = 8 x /64 blocks
Your prefix delegate might be 2600:1702:980:25e0?
2600:1702:980:25e0: The last zero is what will increment. /61 block means you have 0 to 7. 2600:1702:980:25e0: 2600:1702:980:25e1: 2600:1702:980:25e2: 2600:1702:980:25e3: 2600:1702:980:25e4: 2600:1702:980:25e5: 2600:1702:980:25e6: 2600:1702:980:25e7:
On my Fortinet 60E I have it setup to auto-increment each interface. Check out the notes in that section