IPv6 Subnetting

johnwest43

Just want to make sure I am understanding this correctly.

Given a network 2340:1140::/26

the valid addresses in this range would be:
2340:1140::1
thru
2340:11FF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF

This is the edited portion below:

From what i can see now:
given a network 2340:1140::/26

useable addresss would be:
2340:1140::1
thru:
2340:117F:FFFF:FFFF:FFFF:FFFF:FFFF:FF7F
Does this look better?

Thanks in advance for the help

Forsaken_GA

Yes, your revision is correct.

vinbuck

Along the lines of IPv6 subnetting, I've been wondering if it is correct to refer to IPv6 prefixes as subnets, since the word subnet implies a network that falls under a major classful network. As far as I am aware, IPv6 is completely classless.

Thoughts?

johnwest43

So where im still kind of lost is the last quartet. from what i see from IOS FF80 thru FFFF (in the last quartet) is reserved for anycast.

Is this correct? I am having a hard time finding documentation on this.

Thanks again.

Forsaken_GA

vinbuck wrote: »

Along the lines of IPv6 subnetting, I've been wondering if it is correct to refer to IPv6 prefixes as subnets, since the word subnet implies a network that falls under a major classful network. As far as I am aware, IPv6 is completely classless.

Thoughts?

It depends on where you're getting your definition of subnets. In it's overview, RFC 950 has the following:

This memo discusses the utility of "subnets" of Internet networks,
which are logically visible sub-sections of a single Internet
network.

That doesn't specify classful networks, just that a subnet is a logical division of a defined network, which is pretty broad. For me, I consider a subnet to be a logical partitioning of an assigned prefix, whether that be private space, an allocation from an RIR, or an allocation from an ISP, etc.