IPv6 TCP

[Kevin Oberman]

> Date: Mon, 28 Dec 2009 18:02:29 -0800 (PST)
> From: Pamela Rock <prock111 at yahoo.com>
> 
> 
> 
> --- On Mon, 12/28/09, Mark Andrews <marka at isc.org> wrote:
> 
> > From: Mark Andrews <marka at isc.org>
> > Subject: Re: IPv6 TCP
> > To: "Pamela Rock" <prock111 at yahoo.com>
> > Cc: "Kevin Oberman" <oberman at es.net>, "Chuck Anderson" <cra at WPI.EDU>, bind-users at lists.isc.org
> > Date: Monday, December 28, 2009, 8:22 PM
> > 
> > In message <475084.65186.qm at web110304.mail.gq1.yahoo.com>,
> > Pamela Rock writes:
> > > This query is to anyone in general, based on the
> > previous dig statement, do=
> > > es the following command make sense??
> > > 
> > > dig -6 www.es.net @some:ipv6:address +tcp
> > > 
> > > I'm wondering if the combination of -6,
> > @some:ipv6:address, and +tcp even m=
> > > ake sense.  That is ultimately what I'm trying to
> > achieve.
> > 
> > Yes, it make sense.  The following will retrieve the
> > SOA record
> > from ns-ext.isc.org using its IPv6 address over tcp. 
> > If you put a
> > literal IPv6 address rather than a name then the -6 is not
> > needed.
> 
> That's it!!  So you are saying if I can use either -6 or
> MY:IPv6:Address, but I don't have to use both?  Is that accurate?  If
> so, that resolves the issue.

If you tell dig(1) to query an IPv6 address, it has no choice but to
use IPv6, so -6 is unnecessary and -4 is an error. The only reason
for the -4 and -6 options is to force that protocol to be used when a
name is provided and it has both v4 and v6 addresses.

That said, using -6 with an IPv6 address should not cause a problem. It
certainly works fine for me.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4  EADA 927D EBB3 987B 3751