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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Actually, Owen, now the day has come, I can say I love it.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">No one likes tradeoffs. No one wants to compromise.
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Ryland just told us we have a near perfect title for a spec that is bound to be hated.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Keep safe;<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Pascal<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Calibri"><span style="font-size:11.0pt;font-weight:bold">From:</span></font></b> Owen DeLong <owen@delong.com>
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<b><span style="font-weight:bold">Sent:</span></b> mercredi 30 mars 2022 22:33<br>
<b><span style="font-weight:bold">To:</span></b> Ryland Kremeier <rkremeier@barryelectric.com><br>
<b><span style="font-weight:bold">Cc:</span></b> Pascal Thubert (pthubert) <pthubert@cisco.com>; Philip Homburg <pch-nanog-2@u-1.phicoh.com>; nanog@nanog.org; 'jordi.palet' (jordi.palet@consulintel.es) <jordi.palet@consulintel.es><br>
<b><span style="font-weight:bold">Subject:</span></b> Re: V6 still not supported <o:p>
</o:p></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">I think this message is 4 days early.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Owen<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">On Mar 28, 2022, at 11:03 , Ryland Kremeier <</span><a href="mailto:rkremeier@barryelectric.com">rkremeier@barryelectric.com</a></font>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><img border="0" width="695" height="283" style="width:7.2395in;height:2.9479in" id="_x0000_i1025" src="cid:image001.png@01D842A4.69CBE6F0"><o:p></o:p></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Hmm.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">-----Original Message-----<br>
From: NANOG <</span><a href="mailto:nanog-bounces+rkremeier=barryelectric.com@nanog.org">nanog-bounces+rkremeier=barryelectric.com@nanog.org</a></font>> On Behalf Of Pascal Thubert (pthubert) via NANOG<br>
Sent: Monday, March 28, 2022 11:55 AM<br>
To: Philip Homburg <<a href="mailto:pch-nanog-2@u-1.phicoh.com">pch-nanog-2@u-1.phicoh.com</a>>;<span class="apple-converted-space"> </span><a href="mailto:nanog@nanog.org">nanog@nanog.org</a>; 'jordi.palet' (<a href="mailto:jordi.palet@consulintel.es">jordi.palet@consulintel.es</a>)
<<a href="mailto:jordi.palet@consulintel.es">jordi.palet@consulintel.es</a>><br>
Subject: RE: V6 still not supported<span class="apple-converted-space"> </span><o:p></o:p></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Seems that we lost sync.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">I would not rephrase so I made it a draft to make it easy to socialize:<span class="apple-converted-space"> </span></span><a href="https://www.ietf.org/archive/id/draft-thubert-v6ops-yada-yatt-00.html"><font color="black"><span style="color:windowtext;text-decoration:none">https://www.ietf.org/archive/id/draft-thubert-v6ops-yada-yatt-00.html</span></font></a></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">The goal is NOT to allow any IPv4 host to talk to any IPv6 host. For that I agree you need the traditional transition mechanisms, CG-NATs etc.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">The plan has 2 phases:<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">- The first phase called YADA extends the reach of IPv4 using a common IPv4 space that is like an elevator shaft.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> /------------------------------------------------------<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / |------------| realm 1 /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / /. /. /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / / . shaft / . (current IPv4 Internet) /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / |------------| . /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / . . . . /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> ------------------------------------------------------/<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> | . | |<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> /-----|------------|--|--------------------------------<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / | . | | /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / | |---------|--| realm 2 /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / | /. | /. /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / |/ . shaft |/ . /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / |------------| . /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / . . . . /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> ------------------------------------------------------/<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> | . | |<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> | . | |<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> | | .<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> | | .<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> . . |<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> . . |<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> | . | |<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> /-----|------------|--|--------------------------------<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / | . | | /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / | |---------|--| realm N /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / | / | / /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / |/ shaft |/ /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / |------------| /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> / /<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> ------------------------------------------------------/<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">There's more in the draft as to how forwarding happens. But only a few routers serving the shaft have to do anything and it's dead simple.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">In that phase, we can now have many realms that are parallel to the IPv4 Internet of today. IPv4 acts as normal in each realm.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">The phase upgrades IPv4 host to understand an IP in IP format that allows to traverse the shaft. At that time, scale is no more the issue for IPv4. <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">- The second phase called YATT does a stateless translation between a v4 in v4 and a v6 address. No CG-NAT.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">+-----+---------------+--------------+-----------------------------+<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">|YATT | Realm | IPv4 | Well-Known |<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">|Space| Address | Address | IID |<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">+-----+- -------------+--------------+-----------------------------+<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <- YADA<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> Prefix -><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><-------- YATT Prefix ----------><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">What it does is allow any node that needs to talk to a legacy device, to 1) obtain a YADA address (IPv4 pair), 2) form a YATT address (YADA derived IPv6 address), and talk to
the YADA node, across any of v4 or v6 networks. A stateful bump in the stack can NAT the IP pairs into single Ips and back. A bump in the stack on the legacy host can NAT the IP pairs into single Ips as well.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">In that phase, IPv6 can be seen as the sphere that that encompasses the planes above, and a lot more. Every node that has a YADA address owns a full IPv6 prefix automatically.
Nodes and networks can migrate to IPv6 only but the nodes that need to talk to IPv4 nodes need an YATT address for that.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">There will be corner cases, like well-known IPv4 coded in legacy application payload. For those arguably we'll need a stateful CG-NAT that knows the mapping in advance. But maybe
those are not many, and will mostly stay within their realm.<span class="apple-converted-space"> </span><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Am I being any clearer now?<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Keep safe;<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">Pascal<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"> <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> -----Original Message-----<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> From: NANOG <</span><a href="mailto:nanog-bounces+pthubert=cisco.com@nanog.org"><font color="black"><span style="color:windowtext;text-decoration:none">nanog-bounces+pthubert=cisco.com@nanog.org</span></font></a></font>>
On Behalf Of<o:p></o:p></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> Philip Homburg<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> Sent: samedi 26 mars 2022 12:24<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> To:<span class="apple-converted-space"> </span></span><a href="mailto:nanog@nanog.org"><font color="black"><span style="color:windowtext;text-decoration:none">nanog@nanog.org</span></font></a></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> Subject: Re: V6 still not supported<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">><span class="apple-converted-space"> </span><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> >The only far ressemblance with 6to4 is the thing that was actually<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> >nice in the design, the automatic word in automatic tunnel. Which<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> >for the rest of us mean s stateless. Compared to CGNATs that is huge.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">><span class="apple-converted-space"> </span><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> Any form of communication with the current IPv4 internet requires some<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> sort of CGNAT. We no longer have enough IPv4 addresses to give each<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> customer an unique one. So some ISPs are forced to map multiple<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> customers to a single IPv4 address. Which results in CGNAT.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> Technically,<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> A+P (address plus port) mapping is a bit different, but for the<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> A+customer<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> that doesn't make a lot of difference. And A+P has serious scalability<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> problems.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">><span class="apple-converted-space"> </span><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> >Beyond that the proposal is not a tunnel and more akin to a nat64<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> >since it all ows v6 nodes to talk to v4 nodes. The network can be<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> >pure v4 or pure v6 if the method is implemented as a bump in the<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> >stack at the<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> wrong end.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">><span class="apple-converted-space"> </span><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> You mostly ignored the routing problems I brought up. With NAT64 each<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> ISP is in full control over all routing. Your problem has routing<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> aspects that are not under control of the ISP.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">><span class="apple-converted-space"> </span><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> >Your response is also missing the capability to extend the IPv4<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> >network a mill ion times. Or drop it completely while maintaining<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> >IPv4<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> applications.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">><span class="apple-converted-space"> </span><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> Extending IPv4 is fine (except for the installed base of IPv6). It is<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> not fine if the extension leads to problem in other areas, like routing.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">><span class="apple-converted-space"> </span><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> There are other problems to consider. For example, IPv6 can be added<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> transparently to a network with legacy IPv4-only hosts. Hosts can get<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> a public IPv6 address and a RFC 1918 IPv4 address. I wonder how in<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> your approach such a mix of legacy and new hosts will work out.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">><span class="apple-converted-space"> </span><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> >6to4 was meant for early v6 to interconnect islands. A solution for a<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> >problem that never really existed. Solutions without a problem aren?t<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> usually popular.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">><span class="apple-converted-space"> </span><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> We seem to have a different recall of history. 6to4 was extremely<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> popular.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> Popular enough that major content providers did not turn on IPv6 until<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> host stacks were modified to essentially kill 6to4. (in case we are<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> talking about different 6to4 protocols. I meant the one that<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> interconnects with the<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">> non-6to4 IPv6 internet. So more than just islands)<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt">><span class="apple-converted-space"> </span><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt"><o:p> </o:p></span></font></p>
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