Custom local networks and public IP settings span subnets. ThemacOS Deployment Referencestates, "To optimize bandwidth across subnets, use ‘Cache content for devices using custom local networks’ to specify multiple subnets and ‘devices using the same public IP address’ for broader reach."
[References:, macOS Deployment Reference, "Content Caching" section., Apple Platform Deployment Guide, "Caching Configuration" section., , ]
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