Changes between Version 8 and Version 9 of 802.11/MAC/Upper/MACHighFramework/EthEncap


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Timestamp:
Oct 2, 2014, 1:25:32 PM (9 years ago)
Author:
chunter
Comment:

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  • 802.11/MAC/Upper/MACHighFramework/EthEncap

    v8 v9  
    4343
    4444The de-encapsulation process has the added step of needing to undo the spoofing that took place during the encapsulation process. From the address stored previously in memory, the 802.11 STA overwrites the outgoing destination address as well as the address stored internally to ARP packets before transmitting the packet via Ethernet.
     45
     46== IBSS Node ==
     47
     48||  [[Image(wiki:802.11/files:IBSS_encap.png, width=600)]]  ||
     49||  '''IBSS Node Encapsulation and De-encapsulation'''  ||
     50
     51The above figure shows how an IBSS node encapsulates and de-encapsulates different types of Ethernet frames. An IBSS node has the same challenge as a traditional STA -- it must spoof the MAC address of whatever Ethernet client is attached to it.
     52
     53=== Encapsulation ===
     54
     55The encapsulation behavior is nearly identical to the STA. The only difference is that the Ethernet destination addresses is directly used as the RA (addr1). In an IBSS, traffic is not sent via an AP. It is addressed directly.
     56
     57=== De-encapsulation ===
     58
     59De-encapsulation is also nearly identical to the STA. Since the RA (addr1) contains the destination of the wireless frame, that address is used as the destination address of the outgoing Ethernet frame.