2.3 appears to accept ra when it shouldn't?

[bodosom]

My understanding was that net.inet6.ip6.accept_rtadv: 0 also meant no SLAAC.
Is that not the case?  Does autoconf preclude dhcp6?  igb0 is not accepting the offered address but it is taking the PD.

igb0: flags=8843 <up,broadcast,running,simplex,multicast>metric 0 mtu 1500
	options=400bb <rxcsum,txcsum,vlan_mtu,vlan_hwtagging,jumbo_mtu,vlan_hwcsum,vlan_hwtso>ether 00:08:a2:09:ea:f2
	inet6 fe80::208:a2ff:fe09:eaf2%igb0 prefixlen 64 scopeid 0x1 
	inet 192.168.0.250 netmask 0xfffffc00 broadcast 192.168.3.255 
	inet6 2604:6000::208:a2ff:fe09:eaf2 prefixlen 64 autoconf

igb1: flags=8843 <up,broadcast,running,simplex,multicast>metric 0 mtu 1500
	options=400bb <rxcsum,txcsum,vlan_mtu,vlan_hwtagging,jumbo_mtu,vlan_hwcsum,vlan_hwtso>ether 00:08:a2:09:ea:f3
	inet 192.168.5.254 netmask 0xffffff00 broadcast 192.168.5.255 
	inet6 fd90:fee4::208:a2ff:fe09:eaf3 prefixlen 64</rxcsum,txcsum,vlan_mtu,vlan_hwtagging,jumbo_mtu,vlan_hwcsum,vlan_hwtso></up,broadcast,running,simplex,multicast></rxcsum,txcsum,vlan_mtu,vlan_hwtagging,jumbo_mtu,vlan_hwcsum,vlan_hwtso></up,broadcast,running,simplex,multicast>