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Extract mac address from non DUID-LL[T] requests using relayinfo's EU…
…I-64 address in peer-address field, if present Summary: DUID-EN or DUID-UUID are client ids that don't contain mac address information in them, dhcplb can still extract the mac address by looking at the RelayInfo header in RelayFwd messages, the peer-address field there contains an EUI-64 address. It is possible to extract the mac address from there. See https://supportforums.cisco.com/document/100566/understanding-ipv6-eui-64-bit-address We do that using https://github.com/mdlayher/eui64 Reviewed By: fiorix Differential Revision: D5562502 fbshipit-source-id: f33bcdd734cd0bad06843945c8e829f71e901d8e
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