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DHCP v4 has Circuit ID option(82:1) for defining the actual interface ID of the Client.

What is the equivalent option in DHCPv6?

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Section 22.18 of RFC3315 - the DHCPv6 RFC - defines an Interface-Id option (option-code 18) which allows the client to provide interface information to the DHCPv6 server.

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Thanks a lot aid – Sivakumar Jan 2 '12 at 7:12

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