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ISP :

I have an Archer D5 to connect to an ADSL with Static IP from Telecom Italia here in Italy

I have 8 IP's from the ISP

88.xx.xx.88 is the 1st
255.255.255.248 is the subnet mask

88.xx.xx.89 is the Gateway

so I used 88.xx.xx.90 as the public IP on my router

Wan is connected but I get an error when i run diagnostic saying that I can't connect to the gateway

On my old router (an old TP-Link) I can see Static Routes but I can't set up these in the D5

Someone out there can help me ?