question about ESS (previous post has some parts deleted)
Last Post: June 6, 2006:
I am reposting because the previous is getting odified (size restrictions??)
Suppose two BSSs have been connected through a DS to form a ESS.
Suppose STA1 is in BSS1 and STA2 is in BSS2. Also, suppose FTP application at STA1 wants to send a packet to STA2.
Config: STA1-->AP-BSS1-----DS----AP-BSS2<STA2> 802.11 MAC at STA1 --> 802.11 MAC at AP-BSS1 --> (through DS unspecified by spec) --> 802.11 AP-BSS2 --> 802.11 STA2 --> LLC STA2 --> IP STA2. Is this correct?
3) In particular, since LLC is used only for multplexing/demultiplexing here, the packet reaches the LLC layer only at STA2 (destination). Is this correct?
4) Finally, the way the 802.11 MAC layers at AP-BSS1 and AP-BSS2 know how to forward packets is because STA1, AP-BSS1, AP-BSS2 place the right combination of addresses in the address1 fields - address 2 field - address 3 field and adrress 4 field, and in the from DS & to DS fields. Is this correct?
5) If STA2 belongs to a different ESS or has to be accessed through a portal, then the IP address at STA1 for next hop will be the IP address of gateway router. Is this correct?
Thanks for your time. I look forward to hearing from you.
Arvind - Ph.D. student preparing job interviews (which never seem to come)!!
There is something wrong...my post gets modified..Is there a message size limit?