Re: Trying to add inet6 address w/o inet6 support resets interface configuration

[David Young <dyoung%pobox.com@localhost>]

On Mon, May 19, 2008 at 11:15:59AM -0700, Scott Ellis wrote:
> On Mon, May 19, 2008 11:04 am, David Young wrote:
> > On Mon, May 19, 2008 at 09:33:01AM -0700, Scott Ellis wrote:
> >> On Mon, May 19, 2008 9:29 am, David Young wrote:
> >> > On Sat, May 17, 2008 at 12:44:15PM -0700, Scott Ellis wrote:
> >> >> I noticed this on the May 5th kernel+userland, and just now got a
> >> chance
> >> >> to try it on today's kernel+userland.
> >> >>
> >> >> I always build my systems w/o INET6 (no need for it yet).
> >> >> Unfortunately, after boot, lo0 isn't configured.  Turns out running
> >> >> "ifconfig lo0 inet6" (as is done twice in rc.d/network) results in a
> >> >> SIOCAIFADDR error, that removes the configuration entirely. :-(
> >> >>
> >> >> For example...
> >> >>
> >> >> intrepid{~}# ifconfig lo0
> >> >> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33648
> >> >>         inet 127.0.0.1 netmask 0xff000000
> >> >> intrepid{~}# ifconfig lo0 inet6
> >> >> lo0: SIOCAIFADDR: Address family not supported by protocol family
> >> >
> >> > On intrepid, what domain name does 'inet6' resolve to?
> >>
> >> That's a weird question. :-) I'm using OpenDNS, so I get:
> >>
> >> intrepid{~}% nslookup inet6
> >> Server:         127.0.0.1
> >> Address:        127.0.0.1#53
> >>
> >> Non-authoritative answer:
> >> Name:   inet6.warped.com
> >> Address: 208.67.219.132
> >>
> >> Is that what you wanted to know?
> >
> > Yes.  I have just committed a fix for a related bug, but it looks to
> > me like ifconfig may be working correctly in this case.  How do you
> > build your userland?  Do you use any MKxxxx or USExxxx options, such as
> > MKINET6=no or USE_INET6=no?
> 
> Yeah, MKINET6=no and no inet6 in the kernel (hence the SIOCAIFADDR from
> ifconfig).  The full list of MK* for my build is:

Ok.  Please try the latest ifconfig.

I think that one always runs the risk of replacing the first IPv4 address
on lo0, with either the old ifconfig or the new, by running 'ifconfig
lo0 inet6' on a MKINET6=no userland.

Dave

-- 
David Young             OJC Technologies
dyoung%ojctech.com@localhost      Urbana, IL * (217) 278-3933 ext 24