Hi Naomi, Good question! Yes, you can still use NAT mode even if an overlapping subnet exists on the network. Client traffic is translated to use the IP address of the access point when accessing internet resources. Therefore, it won't cause any addressing conflicts with your existing 10.0.0.0/8 network. To answer your 2nd question, there is no way to edit which subnet is used for NAT mode. This is a fixed setting. To learn more about NAT mode, you can check out this article from our documentation: https://documentation.meraki.com/MR/Client_Addressing_and_Bridging/NAT_Mode_with_Meraki_DHCP
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