A method at a Session Management Function, SMF, for facilitating reuse of a private Internet Protocol, IP, address at multiple User Equipments, UEs, comprising (i) a first UE (211, 212, 213, 214), wherein a first User Plane Function, UPF and a second UPF are connected to the SMF, wherein the first UPF maintains a first private IP address range and the second UPF maintains a second private IP address range, and wherein the first and second private IP address ranges are at least partially identical, the method comprising: transmitting (403, 407, 410, 510), to a Data Network-Authentication, Authorization & Accounting, DN-AAA, accounting server, a first request message associated with the first UE (211, 212, 213, 214), the first request message comprising (i) the private IP address comprising an IPv4 address not being globally unique, and (ii) a selected first 3GPP-IP-Address-Pool-Info which, in conjunction with the private IP address, uniquely identifies a Protocol Data Unit, PDU, session of the first UE (211, 212, 213, 214), wherein the first 3GPP-IP-Address-Pool-Info indicates information on an IP address pool applicable to the private IP address; and receiving (404, 408, 411, 520), from the DN-AAA accounting server, a first response message associated with the first UE (211, 212, 213, 214) in response to the first request message, wherein: - the first request message is one of: an Accounting-Request START message, an Accounting-Request STOP message, an ACR Command, and an Accounting-Request Interim-Update message, and - the first response message is a corresponding one of: an Accounting-Response START message, an Accounting-Response STOP message, an ACA Command, and an Accounting-Response Interim-Update message. transmitting (403, 407, 410, 510), to a Data Network-Authentication, Authorization & Accounting, DN-AAA, accounting server, a first request message associated with the first UE (211, 212, 213, 214), the first request message comprising (i) the private IP address comprising an IPv4 address not being globally unique, and (ii) a selected first 3GPP-IP-Address-Pool-Info which, in conjunction with the private IP address, uniquely identifies a Protocol Data Unit, PDU, session of the first UE (211, 212, 213, 214), wherein the first 3GPP-IP-Address-Pool-Info indicates information on an IP address pool applicable to the private IP address; and receiving (404, 408, 411, 520), from the DN-AAA accounting server, a first response message associated with the first UE (211, 212, 213, 214) in response to the first request message, wherein: - the first request message is one of: an Accounting-Request START message, an Accounting-Request STOP message, an ACR Command, and an Accounting-Request Interim-Update message, and - the first response message is a corresponding one of: an Accounting-Response START message, an Accounting-Response STOP message, an ACA Command, and an Accounting-Response Interim-Update message. - the first request message is one of: an Accounting-Request START message, an Accounting-Request STOP message, an ACR Command, and an Accounting-Request Interim-Update message, and - the first response message is a corresponding one of: an Accounting-Response START message, an Accounting-Response STOP message, an ACA Command, and an Accounting-Response Interim-Update message.