This object is the actual primary destination IP address for this specific association, populated once SCTP selects the primary path after INIT and INIT-ACK, interpreted using the type reported by the companion object. This is the concrete address to use for out-of-band ping or traceroute troubleshooting of this specific link, since SCTP multihoming means the association may have several candidate addresses but only one is actually primary at a given time. If this shows 10.20.30.5 while the association's secondary address 10.20.31.5 is what is actually reachable, that mismatch would explain why this association keeps retransmitting or failing over.