Re: OT: IPv6 Questions

I would suggest checking this link ... it is pretty good.
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6553/white_paper_c11-558744-00_ns1017_Networking_Solutions_White_Paper.html

HTH,

Andrew

On Wed, Feb 16, 2011 at 3:02 AM, Aaron Riemer <ariemer_at_amnet.net.au> wrote:

> Hey guys,
>
>
>
> I am just learning up on IPv6 and have a couple of questions. An example
> would probably be best to convey what I am trying to get my head around.
>
>
>
> Let's say I want to run IPv6 globally over the Internet. I am assigned an
> global unicast IPV6 address block and start advertising this block to my
> ISP's with BGP.
>
>
>
> What happens when an IPv4 host out on the internet wants to access my
> companies web service? Would I need to run dual stack and have a
> corresponding global IPv4 block advertised as well?
>
>
>
> Another example. Let's say a host is running dual stack somewhere out on
> the
> Internet and decides to use IPv6 by default. Is there a way that these
> hosts
> can "Fail back" to IPv4 if for example some destination out on the Internet
> is IPv4 only? i.e. IPv6 DNS lookup does not return an IPv6 address
> therefore
> do an IPv4 DNS lookup?
>
>
>
> You can start to see why the take up of IPv6 has been so slow. Why run dual
> routing tables when 99% of the Internet are running IPv4?? What is the
> driving force? Sure Addresses are running out but unless the RIR's start
> stripping me of my IPv4 addresses why do I care?
>
>
>
> Thanks for any clarification guys as usual.
>
>
>
> -Aaron
>
>
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-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net