Squid connection to Fibre switch

Hello,
Please note that we have squid and running properly on ADSL connection. We have upgraded the link to connect through our Fibre switch with a public static IP.

How do we configure squid to connect through this static ip? Note when we connect it directly from fibre switch to our laptop - we can connect sucessfully and browse the internet.

Appreciate your assistance please.

Thanks
Isoa