I have a challenge where I need to create a completely autonomous network within my Meraki Networks. Meaning I have another company that is renting some space within our building. They have brought in their own ISP and Firewall. The length between where their ISP/Firewall and their client computers are long but I have two Meraki switches, connected with fiber, in close proximity.
What I am trying to do is use my switches/dedicated ports, to simply create a "separate" network to route traffic through my switches but using their Watchguard Firewall and ISP. I have tried to create a separate VLAN using their specific IP addressing and Gateway, but obviously, it sees that VLAN as part of my network, and thus their firewall/DHCP/ etc. is not routing the traffic.
Any help with this challenge would be appreciated, If a diagram would help let me know.