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added text about how the EB provides for finding the Join Proxy, and the use of an anycast address for the Join Proxy

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File draft-ietf-6tisch-minimal-security.mkd Modified

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 and MAY further follow the Neighbor Discovery (ND) process described
 in Section 5 of [RFC6775].
 
+A pledge finds the layer-2 address of the Join Proxy by looking at the
+EUI64 source address of enhanced beacons it has received that have the
+Network ID extension,  and have the Join Proxy bit set.
+The Layer-3 address is the anycast address TBD1.
+
+The pledge need not do ND for the Join Proxy (which requires an expensive multicast),
+but rather can form the layer-2 address directly from the EUI-64 that was seen.
+
+The pledge uses it's link-local address when speaking to the JRC via the Join Proxy.
+
 ## Step 3 - Security Handshake
 
 The security handshake between pledge and JRC uses Ephemeral