3.2.5.2.2 Receiving a Hello Message
If the Requestor is in the "TLS Connected" state, the processing of the Hello message MUST follow the rules specified in section 3.3.5.2.2.
Otherwise, if the Requestor is not in the "Hello Sent" state, the Hello message MUST be silently discarded and the connection MUST be terminated.
Otherwise (if the Requestor is in the "Hello Sent" state), if there is a MyGMC message accompanying the Hello message, the two MUST be processed as specified in section 3.2.5.2.3.
Otherwise, the local node MUST:
Check the Member List to find a non-expired GMC for the peer, based on the Remote IDC that was received as part of the TLS negotiation.
If a non-expired GMC is not found, the connection MUST be terminated.
Otherwise, P2P Graphing MUST be notified that the local node is now connected to the group by way of the peer.