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Beginner

WAN IP through SG300-28PP

Hi,

I have a SG300-28PP and I want it to forward my public IP to my firewall.

My ISP is using G.fast with phone lines to provide internet services. I managed to get one G.fast SFP from my ISP (instead of buying a G.fast modem) and pluged it into the switch. The SFP is seen as a 1Gb/s fiber interface. So I guess there's no compatibility issue.

The following scheme is what I would like to reach
ISP ---> SG300 ("pure bridge") ---> Firewall (public IP)

So I created vlan 100. This is like the WAN vlan.
And configured two interfaces :

interface gi1/27 (G.fast SFP)
switchport mode acces
switchport access vlan 100

interface gi1/28
switchport mode access
switchport access vlan 100

Unfortunately, my firewall is unable to get a public IP.

So my question is : did I miss something ?

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