A method for communicating a packet flow in a communication network, characterized in that the method comprises: determining, by a source node (610, 622, 624, 626, 628, 632, 636), a format for a first flow handle, FH, based on flow treatment information which reflects a treatment to be rendered to packets of the packet flow by a second network node (610, 622, 624, 626, 628, 632, 636); constructing, by the source node (610, 622, 624, 626, 628, 632, 636), the first flow handle, FH, in accordance with the format; embedding, by the source node (610, 622, 624, 626, 628, 632, 636), the first FH into the least significant bits of an Internet Protocol, IP, version six, IPv6, source address field of an IPv6 header of a packet of the packet flow to replace an interface identifier in the IPv6 source address field of the IPv6 header; and transmitting, by the source node (610, 622, 624, 626, 628, 632, 636622, 624, 626, 628, 632, 636), the packet of the packet flow to the second network node (610, 622, 624, 626, 628, 632, 636); wherein the flow treatment information comprises at least one of: a packet flow identifier, ID, identifying a particular sequence of packets to which the first packet belongs, a service function chain, SFC, ID that is used to forward the first packet along a pre-defined SFC, an access point, AP, ID identifying a network AP, a radio access bearer ID that identifies a radio access link connection, a path ID that is used to forward the first packet over a pre-defined path, a quality of service, QoS, code point that identifies a QoS requirement of the first packet, or a device ID that identifies a device associated with the packet of the packet flow. determining, by a source node (610, 622, 624, 626, 628, 632, 636), a format for a first flow handle, FH, based on flow treatment information which reflects a treatment to be rendered to packets of the packet flow by a second network node (610, 622, 624, 626, 628, 632, 636); constructing, by the source node (610, 622, 624, 626, 628, 632, 636), the first flow handle, FH, in accordance with the format; embedding, by the source node (610, 622, 624, 626, 628, 632, 636), the first FH into the least significant bits of an Internet Protocol, IP, version six, IPv6, source address field of an IPv6 header of a packet of the packet flow to replace an interface identifier in the IPv6 source address field of the IPv6 header; and transmitting, by the source node (610, 622, 624, 626, 628, 632, 636622, 624, 626, 628, 632, 636), the packet of the packet flow to the second network node (610, 622, 624, 626, 628, 632, 636); wherein the flow treatment information comprises at least one of: a packet flow identifier, ID, identifying a particular sequence of packets to which the first packet belongs, a service function chain, SFC, ID that is used to forward the first packet along a pre-defined SFC, an access point, AP, ID identifying a network AP, a radio access bearer ID that identifies a radio access link connection, a path ID that is used to forward the first packet over a pre-defined path, a quality of service, QoS, code point that identifies a QoS requirement of the first packet, or a device ID that identifies a device associated with the packet of the packet flow.