I don't understand why your problem is happening. The important
variable is ip6mode= in rc.conf. The default value is 'host', which
means that only v6 addresses specified in /etc/ifconfig.fooN are set.
Setting to autohost causes the machine to process received v6 Router
Advertisements by setting "sysctl -w net.inet6.ip6.accept_rtadv=1".
While a machine in 'host' mode gets link-local addresses, I don't know
of anything that would cause problems with v4 interoperability from
that.
fwip0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
address: 00:11:d8:00:00:f3:a9:66
fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
address: 00:18:f3:ad:85:bd
media: Ethernet autoselect (10baseT)
status: active
inet 192.168.1.4 netmask 0xffffff00 broadcast 192.168.1.255
inet6 fe80::218:f3ff:fead:85bd%fxp0 prefixlen 64 scopeid 0x2
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33192
inet 127.0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
There's no global address, so there should be no issue.
Do 'netstat -nr -f inet6' to see what's in your routing table. All the
normal programs should do dns lookups for AAAA and A, and try the AAAA
values first, but on a machine with no configured addresses and in
ip6mode=host, there should be no default route and use of those
addresses should fail immediately with ~"No route to host".
Also check the accept_rtadv sysctl, and verify that the contents of
/etc/defaults and /etc/rc.d match the release.
As far as I know the only way to take out v6 completely is to remove
INET6 from the kernel config.
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