Hi Colin:
According to the 802.15.4-2003 specification (which 6lowpan uses), the association response command includes the PAN Id and short address for the associating device in question, which info is stored with the associating device upon successful receipt (7.3.1.4.3). The PAN Identifier is present in almost every frame or assumed implied in case of frames originating from or directed towards a PAN coordinator (7.2.2.1.6, 7.2.2.1.7, 7.2.1.3, 7.2.1.5). So, indeed, not sure how one can even communicate with 802.15.4-2003 without a device participating in the network having knowledge of its own PAN Id. Best regards, Rene From: [email protected] [mailto:[email protected]] On Behalf Of Colin O'Flynn Sent: Thursday, March 04, 2010 5:59 PM To: [email protected] Subject: [6lowpan] 6lowpan 16-bit PAN-ID Field Hello, RFC4944 has the quote: First, the left-most 32 bits are formed by concatenating 16 zero bits to the 16-bit PAN ID (alternatively, if no PAN ID is known, 16 zero bits may be used). This produces a 32-bit field as follows: How does a receiving node know if zero's have been used there to recreate the IP addresses? Unless I'm missing something, this seems to be a ambiguous case. It seems unlikely a node will know it's short address but not PAN-ID. Regards, -Colin
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