On Thu, Jan 08, 2015 at 09:53:10AM -0500, Sly Midnight wrote:
> I am replying to this as I too would like some clarification as to the
> difference between the two options {eui64|autoconf} for enabling the old
> IPv6 behavior.

in ifconfig(8) we have:

     -inet6          Disable inet6(4) on the given interface and remove all
                     configured inet6(4) addresses, including the link-local
                     ones.  This is the default.  To turn inet6 on, use eui64,
                     use autoconf or assign any inet6 address.

[...]

     eui64   Fill the interface index (the lowermost 64th bit of an IPv6
             address) automatically.

[...]

     autoconf        Enable autoconfiguration.  Valid for ``inet6'' only.  If
                     autoconf is enabled router advertisements are accepted on
                     this interface and the kernel sends periodic router
                     solicitations from this interface.

------------------------------------------------------------------------

If you want the old behaviour of only having a link local address on
every interface:
        # ifconfig INTERFACE inet6 eui64
Usually you don't want / need that.

Configure a static ip:
        # ifconfig INTERFACE inet6 2001:DB8::23/64
you will get a link local address automatically, too.

Use a SLAAC ip:
        # ifconfig INTERFACE inet6 autoconf
you will get a link local address automatically, too.

-- 
I'm not entirely sure you are real.

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