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Re: IPV6 Training Books
From: Roman <nurul () apnic net>
Date: Tue, 05 Apr 2011 11:07:13 +1000

Best book on IPv6 (My personal opinion)

http://www.amazon.com/Migrating-IPv6-Practical-Implementing-Networks/dp/0471498920/ref=sr_1_16?ie=UTF8&qid=1301965365&sr=8-16

Roman

On 5/04/11 10:59 AM, Mark Andrews wrote:
In message<690D7D20D2507C44BA8066926B2009890867FA () ES1002 ic-sa com>, Michael R
uiz writes:
Hello All,

                 I am looking for some good reading material to get a better=
  understanding of IPV6.  I know how to convert HEX into decimal format.  Wh=
at I am looking for is how to under the CIDR notation and break them out in=
to subnets.   Thank you in advance.

If you think in hex its straight forward to do CIDR in IPv6.  There
are only three groupings on a non nibble boundaries.  You also
display the entire 128 bits with the least significant bits set to
zero.  The :: notation is used to shorten the displayed address.

e.g for a /57, /58 and /59 with leading bits of 2001:23bc:fe8d:b200::/56
you would have.

/57     {0,1,2,3,4,5,6,7} {8,9,a,b,c,d,e,f}
        2001:23bc:fe8d:b200::/57
        2001:23bc:fe8d:b280::/57
/58     {0,1,2,3} {4,5,6,7} {8,9,a,b} {c,d,e,f}
        2001:23bc:fe8d:b200::/58
        2001:23bc:fe8d:b240::/58
        2001:23bc:fe8d:b280::/58
        2001:23bc:fe8d:b2c0::/58
/59     {0,1} {2,3} {4,5} {6,7} {8,9} {a,b} {c,d} {e,f}
        2001:23bc:fe8d:b200::/59
        2001:23bc:fe8d:b220::/59
        2001:23bc:fe8d:b240::/59
        2001:23bc:fe8d:b260::/59
        2001:23bc:fe8d:b280::/59
        2001:23bc:fe8d:b2a0::/59
        2001:23bc:fe8d:b2c0::/59
        2001:23bc:fe8d:b2e0::/59

Note the last nibble before the :: is 0 and is there so that the
final bits are all zeros.  The following all represent the same
cidr block.

        2001:23bc:fe8d:b2e0::/59
        2001:23bc:fe8d:b2e0:0000:0000:0000:0000/59
        2001:23bc:fe8d:b2e0:0:0:0:0/59

Normally you just assign /64 subnets and delegate address blocks
on nibble boundaries to end customers, e.g. /48, /52, /56 or /60.
This means that end customers don't need do deal with cidr block
if they don't want to.  They can just route individual /64.

MAR.


--
----------------------------------------------------------------------
Nurul Islam Roman                      email:         nurul () apnic net
Internet Resource Analyst, APNIC       sip:       nurul () voip apnic net
http://www.apnic.net                   phone:         +61 7 3858 3100
                                       direct:        +61 7 3858 3190


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