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Previously, Outer Header Removal was set according to PDU session type. However, outer header IP version is independent of inner packet IP version or PDU session type. It typically depends on UPF and gNB configuration. Set it to GTP-U/UDP/IP to handle both IPv4 and IPv6 cases, according to TS 29.244, Table 8.2.64-1, Note 4: "The CP function shall use this value to instruct UP function to remove the GTP-U/UDP/IP header regardless it is IPv4 or IPv6." No changes at UPF are necessary because it already ignores Outer Header Removal Description type and Kernel correctly decapsulates the outer IP header at socket level.
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