Re: IPV6 Training Books

[Owen DeLong <owen () delong com>]

More ideally, you give every end site a /48 if they want more than one network.

Owen

On Apr 4, 2011, at 5:59 PM, 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.
> -- 
> Mark Andrews, ISC
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742                 INTERNET: marka () isc org