Hey Sam, Yeah, everything should route via the route table. So, it should be your default gateway for clients & the MX. It's a little bit old now, but this has stood the test of time 😉 - https://www.youtube.com/watch?v=Prp9HrBjG14&ab_channel=SteveVTSftw The YouTuber goes through the setup which may help. Not sure RE DMZ setup, maybe a new post may attract someone that does - or call Meraki and they may be able to provide some information to you. Hope this all helps. Jonny.
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