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About iCloud Private Relay
iCloud Private Relay is a service provided by Apple as part of a subscription iCloud product. This enables an Apple device to protect its DNS and web traffic against tracking. This service is optional for Apple devices and requires a subscription to be active.
iCloud Private Relay and Cisco Umbrella
iCloud Private Relay will override Umbrella functionality when activated. In order to maintain coverage on enterprise networks, a canary domain may be configured on network as per the instructions on Apple's support page.
MDM on macOS and Supervised iOS
To disable iCloud Private relay, push the following payload with a value of false.
allowCloudPrivateRelay
All other devices
To prevent iCloud Private Relay from activating on a network, set the following domains to respond with a NXDOMAIN or NODATA response:
mask.icloud.com mask-h2.icloud.com
Once set, iCloud Private Relay users will be informed that "Private Relay is turned off for 'network name'", and will not be permitted to utilize iCloud Private Relay on this network.
Enforcing with Umbrella, in Limited Availability
Umbrella is capable of setting this override for your organization. To request this, send us a message at umbrella-support@cisco.com. When overriding the iCloud domains with a NODATA response, any match for content categorization will supersede and return a block page IP. This affects the user experience and can cause timeouts on macOS and iOS devices. After the override is configured, add the following domains to an Allow List for all relevant policies:
mask.icloud.com mask-h2.icloud.com
mask-api.icloud.com
mask.apple-dns.net
iCloud Private Relay and Cisco Umbrella with the Cisco Security Connector App
Unlike devices without Umbrella installed who receive network level coverage, all DNS requests will continue to be logged to Umbrella; however, the canary domain above is required to ensure that DNS blocks are not proxied by iCloud Private Relay and overridden.