Couple things that I can think of off the top of my head: 1. It doesn't sound like you're that familiar with Meraki yet. I'd strongly suggest getting familiar before you start replacing the entire network of a client. 2. I believe that you'll have to create a VLAN for the second network, either the OPT or the LAN1 network. I'm guessing that the Zyxel acted the same way as pfSense acts where it has multiple NICs that are each a network, that's not how Meraki works though. You need to create VLANs for each network and then configure the ports to allow traffic on those VLANs to whichever ports are connected to whichever VLANs. 3. You can almost completely configure Meraki gear through the web portal without hooking them up before hand, when they do get online, they go up to the cloud (asuming there's connectivity) and download firmware if needed and the configuration. The only place where I believe you need to physically connect to the gear is for the MX with configuring the network details of the WAN(s) so i'd suggest that you connect a laptop or one workstation to the LAN port and nothing to the WAN port and configure that as you can't connect it to the network and tell it to have the same IP as the existing gateway (the Zyxel). Hopefully someone else will chime in with some more thoughts. Thanks, Mark
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