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In most cases, one SS will acquire the IP
and/or MAC address of a peer either from the information derived from a TCP
initiation from the other end, or through DNS in the case where it initiates. ARP
usually does the L3-L2 address mapping where required. This behaviour is
consistent with any other IP over 802 medium. In the case of the Ethernet CS, it is
wrong to assume that the BS forwards packets from SS1 to SS2 on the basis of
MAC address, using any behaviour mandated in the 802.16 specification. In the
case of a connection set up by an Ethernet CS, the only reason (In the 802
architecture specs) that an SS would send a PDU to the BS with a MAC address of
anything other than the MAC address of the BS is because that packet is going
to hit an 802.1D bridge as a consequence of being sent to the BS. If the service to the SS is a straight ISP
type service, the SS would usually only ever send L2 traffic addressed to the
BS and the IP addressing determines the destination. So if the Ethernet or
802.1 packet CSs were used in this scenario, payload header suppression would
be particularly effective, given the constancy of the 802 headers. DJ From: Vasanth.Rajan
[mailto:vasantha.rajan@CRANESSOFTWARE.COM] Hi all, Thanks for the replies I got from the group members,still I
have some doubts. I agree in PMP system SS1 cant pass data directly to SS2 and
will send through BS and the BS will decide the destination either based on MAC
address(if we use ethernet CS) or IP address(if we use IP CS),so it means that
every SS's will have the details(ie IP & MAC address) of every other SS's. My question is how come a SS will come to know every other
SS's details(ie through what frame will it get these details) Kindly reply me Thanks Vasanth |