This is how I sometimes approach this "problem" with the MX67: Send the device to the site Let someone connect WAN1 to the internal network (given there is already a network) Convert LAN2 to WAN2 Let them re-patch WAN2 instead of WAN1 to the LAN Configure WAN1 with the appropriate static IPs and all the needed config Let them cable WAN1 to the internet and move to the new MX
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