From ipadm(1M) man page:
- hostmodel (IPv4), hostmodel (IPv6)
- Control send/receive behavior for IP packets on a multi-homed system. The value of hostmodel can be set to strong or weak, corresponding to the equivalent end-system model definitions of RFC 1122. In addition, a third value of src-priority is also supported. In the src-priority hostmodel scenario, a packet will be accepted on any interface, as long as the packet's destination IP address is configured and marked UP on one of the host's interfaces. When transmitting a packet, if multiple routes for the IP destination in the packet are available, the system will prefer routes where the IP source address in the packet is configured on the outgoing interface. If no such route is available, the system will fall back to selecting the “best” route, as with the weak ES case.