C.3 UE Considerations for EAS Re-discovery

23.5483GPP5G System Enhancements for Edge ComputingRelease 17Stage 2TS

A UE that complies with EAS (re-)discovery described in this specification is not recommended to override operator-provided DNS settings. This is necessary for the "closest" EAS server to be selected. Overriding the operator-provided DNS settings means that procedures requiring operator provided DNS server will not work.

NOTE 1: If the user overrides the DNS configuration set by the network using ePCO, for example if the user configures a private DNS configuration via UI, the network DNS configuration configured using ePCO could remain inactive until the user configured DNS setting is revoked by the user.

NOTE 2: If an OS, user or applications override the operator-provided DNS settings, the DNS resolvers or servers in the third party can take the source IP address of the DNS Query as the location information of UE, which can correspond to the remote PSA UPF or other entities (e.g. a NAT server) on the remote/central N6 interface which can lead to a non-optimal choice of the EAS server address.

NOTE 3: If the DNS server configuration in an OS overrides the operator provided DNS, the DNS Queries continue to be sent over the correct PDU Session for the application.

NOTE 4: If the UE (OS or application) uses a DNS resolver that is different than the one provided by the 5GC, then the Session Breakout connectivity mode, option A and B in clause 6.2.3.2 will not work if the EASDF is not in the DNS resolver chain for recursive DNS resolution.