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Is it possible to perform a Layer 2 (MAC address) traceroute?

L2 can be traced with Cisco - provided CDP is enabled. have a look at Cisco's L2 traceroute feature. What you're likely looking for is the mac address which you can find via the ARP table on the ...
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Usage of Flow label in IPv6 header?

RFC 6294 "Survey of Proposed Use Cases for the IPv6 Flow Label" is definitely the answer to the question. One quote: There was considerable debate in the IETF about the very purpose of the ...

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