NWProtocolIP.ECN Flag values for Explicit Congestion Notifications in IP packets. Declarationenum ECN TopicsECN FlagsNWProtocolIP.ECN.nonECTNWProtocolIP.ECN.ect0NWProtocolIP.ECN.ect1NWProtocolIP.ECN.ce RelationshipsConforms ToCopyableEquatableEscapableHashable See AlsoSending IP Optionsinit()ecnserviceClass