en divided into a 12-bit Station ID (that identifies the MS) and a 4-bit FID (that identifies each of the assigned service flows to Secondary management is a connection that may be established during the registration step which can be used to transport standard messages such as Simple Network Management Protocol (SNMP) or Dynamic Host Configuration Protocol (DHCP). CHAPTER 4 IEEE 802. 16m System Operation and State Diagrams the MS). The temporary STID and STID are assigned to the MS during initial entry while in Connected State, to avoid explicit transmission of the MS MAC Address over the air interface that could potentially compromise the privacy and security of the user. On failing to complete any one of the steps of network entry, the MS repeats the Initialization State procedures; otherwise, it proceeds to Con- nected State for downlink or uplink transmissions. During the registration procedure, the MS and BS negotiate supported IP protocol versions and may further negotiate host configuration parameters. The MS is required to notify the network, through the BS, of IP versions (IPv4 and/or IPv6) it supports by including this information in the registration request message. After the network selects one of the IP versions, the BS informs the MS of the selected IP service type (e.g., IPv4 only, IPv6 only, or IPv4/IPv6 dual mode) by including this information in the registration response message. The MS may indicate its capability of configuring host parameters (host address or home network prefix) and may request the additional parameters such as DNS server address to the network through the BS using registration request message. If the MS indicates the capability of configuring host parameters and the BS can support the requested host configuration parameters, the BS includes either the IPv4-Host-Address infor- mation element, the IPv6-Home-Network-Prefix information, or both, and the requested host configuration parameters in the registration response message; otherwise, the MS will be configured by upper la