Meraki Layer3 Switch

[Merakibud]

I have designed a solution where switch is acting as a layer 3 gateway and connecting directly to the ISP modem in a bridge mode. so the switch has  Public IP . and there are couple internal vlans: vlan 2(192.168.2.1/24) and vlan4(192.168.4.1/24) configured on the switch. I have configured the layer3 interface with public IP from the Same subnet as Management and has configured default route pointing on the the Internet Gateway.

suppose switch has xxx.xxx.xxx.2/29

Gateway xxx.xxx.xxx.3/29

layer 3 interface :xxx.xxx.xxx.4/29

gateway xxx.xxx.xxx.3/29

so we have default route with next hop 203.xxx.xxx.3

Ping to the internet sourced from vlan 1 and 2 is not working from Meraki Dashboard

Can you please advice on this?

[ww]

You cant route private ip ranges over de the internet.

You need a NAT router / firewall.

Or your vlans need public IP ranges

[Merakibud]

Can we change the ISP modem to routed mode from bridge mode and make it work?

[ww]

Not really.

Unless your isp modem/router can set static routes for that vlans/subnets to your layer3 switch.

If your isp does nat  with 1 lan subnet you could use that lan subnet for your L2 lan untill you figure out your design