6 IP layer
38.4123GPPNG signalling transportNG-RANRelease 17TS
The 5GC and NG-RAN shall support IPv6 (IETF RFC 8200 [5]) and/or IPv4 (IETF RFC 791 [6]).
The IP layer of NG-C only supports point-to-point transmission for delivering NG AP message.
The 5GC and NG-RAN shall support the Diffserv Code Point marking as described in IETF RFC 2474 [7].