Subject: Re: OK, what's going on with my nfs?
To: Perry E. Metzger <email@example.com>
From: Hisashi T Fujinaka <firstname.lastname@example.org>
Date: 10/29/2003 09:27:08
On Wed, 29 Oct 2003, Perry E. Metzger wrote:
> Hisashi T Fujinaka <email@example.com> writes:
> > On Wed, 29 Oct 2003, Perry E. Metzger wrote:
> > > Hisashi T Fujinaka <firstname.lastname@example.org> writes:
> > > > I am assuming it has something to do with net.inet6.ip6.v6only, but I
> > > > can't figure out where in the man pages it describes this sysctl.
> > >
> > > man 3 sysctl
> > I already looked there and didn't see any description.
> The variable specifies initial value for IPV6_V6ONLY
> socket option for AF_INET6 socket. Please refer to
> ip6(4) for detail.
> The ip6 man page describes in more detail:
> IPV6_V6ONLY controls behavior of AF_INET6 wildcard listening socket. The
> following example sets the option to 1:
> int on = 1;
> setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on));
> If set to 1, AF_INET6 wildcard listening socket will accept IPv6 traffic
> only. If set to 0, it will accept IPv4 traffic as well, as if it was
> from IPv4 mapped address like ::ffff:10.1.1.1. Note that if you set it
> this to 0, IPv4 access control gets much more complicated. For example,
> even if you have no listening AF_INET listening socket on port X, you
> will end up accepting IPv4 traffic by AF_INET6 listening socket on the
> same port. The default value for this flag is copied at socket instanti-
> ation time, from net.inet6.ip6.v6only sysctl(3) variable. The option
> affects TCP and UDP sockets only.
Thank you! I would have never thought to go to the ip6 man page. And
dumb me, I think I was looking on a system (more than one netbsd system)
that had old man pages.
> > > Does the NFS problem go away if you change the sysctl back to the
> > > old value?
> > Yes. I enjoy poking around blindly to fix things. :)
> Okay, that's bad. File a PR saying that the change broke NFS.
Will do, once I figure out what it is breaking. (one of the daemons nfs
depends on isn't coming up.)
Hisashi T Fujinaka - email@example.com
BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte