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two major improvements to neighbor walking: pingbacks, and inbound neighbor walks. Pingbacks are when an inbound neighbor handshakes with us, and we remember to later try to handshake with them (and if we succeed, we add them to our frontier table). Inbound neighbor walks are when we start a neighbor walk using an inbound neighbor (instead of the usual outbound neighbor), in order to learn about other outbound neighbors from its neighbors. Only outbound neighbors will be added to the frontier table, though.
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