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There really isn't a great repository for things, at least that I've
seen... But keep in mind that the binary works the same in IPv6 as
it does in IPv4. :)<br>
<br>
So when you look at a /21, do you look at it as 2000'ish IPv4
addresses? (At which point a single /64 is more than enough)<br>
Or do you look at it as 8 x /24 networks (at which point a /61 is
the technical equivalent)<br>
<br>
/64 is used by many people as the de facto "network" addressing for
any subnet because of all the magical EUI-64 addressing to work
(e.g. less whiny customer calls = better). But anyone doing DHCPv6
will quickly learn that a /64 is a SERIOUS amount of addresses than
can be broken down internally to any variation they really feel
like. (/126 = /30, etc.)<br>
<br>
So to best answer that questions, you have to know a little about
your customer and how they'll use the addresses. /56 seems to be
the way many folks are going with things, but that's 256 /64
networks or the veritable "boatload" of addresses that will be
wasted beyond belief.<br>
<br>
Remember in the old days everyone gave out IPv4 addresses like
candy. Back then 4.2 billion addresses seemed like a lot... Today,
340 undecillion addresses seems like a lot... Times change though!<br>
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<p class="p1"><span class="Apple-converted-space"> </span></p>
<p class="p1"><br>
</p>
<p class="p2"><b>Scott Morris</b>, CCIE<i>x4</i>
(R&S/ISP-Dial/Security/Service Provider) #4713,</p>
<p class="p2">CCDE #2009::D, JNCIE-M #153, JNCIS-ER, CISSP, et al.</p>
<p class="p2">CCSI #21903, JNCI-M, JNCI-ER</p>
<p class="p3"><a class="moz-txt-link-abbreviated" href="mailto:swm@emanon.com">swm@emanon.com</a></p>
<p class="p1"><br>
</p>
<p class="p4">Knowledge is power.</p>
<p class="p4">Power corrupts.</p>
<p class="p4">Study hard and be Eeeeviiiil......</p>
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<br>
On 9/13/10 1:24 PM, Schnell, Darryl wrote:
<blockquote
cite="mid:C31D7F2AE868E84895D378A5B9E42340E40A4FAE74@EXCHANGE2K7.corp.ptd.net"
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<p class="MsoNormal">Can anyone recommend a good IPV6 website
for Beginners? I’ve
read about eight web sites which say the same things and I
feel like my head is
going to explode. I guess the problem I’m having is trying to
understand
how an IPv4 CIDR notation translates in an IPv6 CIDR in order
to fill out ARIN
IPV6 Allocation Template future usage section. My actual
question is –<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If I assigned a customer say an IPV4 /21 in
IPV6 this would
translate into a /56? If I’m not mistaken a /56 would
translate into something
like 65,000 host addresses? That just seems like a lot of
hosts to me,
especially when most of the time I’m working with networks
that are /26
or smaller. I guess my big problem is confusion over labeling.
What would be
the equivalent of a /26, /27, /28 or have we done away with
blocks that small
and simply would just assign a /56 instead?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Does any of the gibberish I wrote make any
sense at all?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any help anyone can offer is much
appreciated.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">D -<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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