Need to share resources from 2 networks, 2 meraki firewalls next to each other

[ThrivePet]

Have 2 Meraki firewalls in the same building with different subnets and not sharing any resources in different Meraki organizations.

Need to be able to share resources between the 2 networks but unable to use site to site VPN since there is an overlapping subnet in one of the organizations (and won't be able to use subnet translation since they're in different organizations).

Was thinking about creating a L3 interface in each firewall (New existing VLAN) and build a static route to direct specific traffic.

This is a live environment and want to make sure this is ok before I configure it

[Mloraditch · Accepted solution]

That would work since you have physical connectivity. Make sure you if you have security needs that you setup appropriate group policies on the new L3 interfaces to firewall the traffic

[rhbirkelund]

What @Mloraditch says.

A new VLAN with a transit network and static rout should work just find. Also make sure to also have the return routes configured, and with a group policy you can limit traffic to and from the resource that you need to share. 

[DTellez]

You can use the site-to-site VNP functionality only by advertising specific networks you need. This way you avoid propagating the duplicate network. You can even set restrictions with the outgoing site-to-site firewall.