[mythtv] Proposed change to Network Communications

Peter Bennett pgbennett at comcast.net
Fri Mar 10 15:15:07 UTC 2017

On 03/10/2017 03:50 AM, Stephen Worthington wrote:
> You have prefixes the wrong way around.  A /64 is the standard size
> for a minimum subnet, where the rest of the address is made up from
> the individual device addresses.  It is like an a.b.c.x address in
> IPv4, where the a.b.c designates a subnet of 256 addresses and .x is
> used for individual devices on that subnet.  A /56 is a bigger address
> space, of 256 /64 subnets.  A /48 is the original recommended
> delegation of IPv6 address space to a customer from an ISP (65536 /64
> subnets), although many now seem to be using /56 instead.  Allocating
> only a single /64 means the customer can not easily create subnets
> from their /64 block as most IPv6 software assumes that /64 will be
> the smallest subnet size.
Hi Stephen

Thank you for setting me straight. This is my first foray into IPV6. It 
is obvious to me now that /56 is a bigger allocation than /64. I will 
follow through and make sure I can find the correct subnet size.


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