It’s under Security Appliance > Splash Page. From there, select the VLAN and then you can choose an existing Meraki theme or use one of your own. The VLANs have to be splash page enabled in the Access Control Settings to update the splash page.
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Or skip the rented gateway all together (granted you don't need voice) and save a few bucks down the road. Just buy a compatible modem such as the SB6190 (DOCSIS 3.0) or the SB8200 (DOCSIS 3.1) and connect it straight to the WAN port on your MX64.
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