Altice ISP Globalconnect Solution "ipalias"

[filipefaria]

Does anyone has had any experience with Portuguese ISP Altice and their Globalconnect solution ?

I will have to setup a fortinet 60F on a customer, but the ISP has setup a bridge on Lan4 router port.

They told me that the wan interface has to be setup on a new interface on Vlan20 with a supplied /30 ip address (not the public ip) and then I have to setup in this same interface the /32 public address.

In Draytek for example this is called ipalias and they even supply a guide on how to setup https://www.draytek.pt/faqs/como-configurar-router-para-acesso-a-internet-via-altice-meo-globalconne...

This is an example of what data I will be supplied with :

VLAN Internet :	20
IP WAN Local :	100.64.22.50/30
IP WAN Remoto :	100.64.22.49/30
IP Internet :	83.240.147.121/32

[AEK]

1. Set the VLAN id of your WAN port to 20
2. Add primary IP 100.64.22.50/30
3. Add secondary IP 83.240.147.121/32
4. Add default route 100.64.22.49
5. NAT your WAN traffic with 83.240.147.121

config system interface
  edit wan1
    set ip 100.64.22.50/30
    set vlanid 20
    config secondaryip
      edit 1
      set ip 83.240.147.121/32
    next
  end
end

config router static
  edit X
    set gateway 100.64.22.49
    set device wan1
  next
end

[filipefaria]

Thank you so much for your reply, will try as soon as possible.