Re: 2.4.21+ - IPv6 over IPv4 tunneling b0rked

Pekka Savola
2003-07-11T10:33:20Z

On Fri, 11 Jul 2003, YOSHIFUJI Hideaki / [iso-2022-jp] ^[$B5HF#1QL@^[(B wrote:
> In article <Pine.LNX.4.44.0307111301520.27036-100000@netcore.fi> (at Fri, 11 Jul 2003 13:03:54 +0300 (EEST)), Pekka Savola <pekkas@netcore.fi> says:
>
> > > We have but we cannot; it is refcnt'ed.
> >
> > I don't understand what you mean. Refcnt'ed by a userland process, so
> > that if you'd want the subnet-router anycast address, the whole time a
> > process (like radvd) should be running.. or what?
>
> Kernel has refcnt for subnet router anycast address.
> Ref/dereference from userspace is done via socket.
> You cannot derefer subnet router anycast address
> from userspace if the socket hasn't refered it.

So? The point is that subnet router anycast address *could* be referenced
explicitly by a user-land socket (e.g. by radvd), not kernel at all.

--
Pekka Savola "You each name yourselves king, yet the
Netcore Oy kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings