IPv6 Loopback/Point-to-Point address allocation

Sat Sep 9 22:09:14 UTC 2017

You want to configure point to point interfaces as /127 or /126 even if you
allocate a full /64 for the link. This prevents an NDP exhaustion attack
with no downside.

Loopback interfaces should be configured as /128. How you allocate these do
not matter.

Den 9. sep. 2017 18.08 skrev "Kody Vicknair" <kvicknair at reservetele.com>:

> All,
>
> I’ve been doing some reading in preparation of IPv6 deployment and
> figuring out how we will break up our /32. I think I’m on the right track
> in thinking that each customer will be allocated a /48 to do whatever they
> wish with it.
>
> I’ve read recent BCOP drafts that have been approved by the IETF:
> https://www.ripe.net/publications/docs/ripe-554
> It looks like the smallest subnet that should ever be assigned is a /64 on
> a particular link.
>
>
> Some questions that come to mind with IPv6:
>
> In regards to Point to point links my thinking is this:
> Assign a unique /64 to each point to point link with these addresses being
> Globally routable. This seems to be what our IX providers do when assigning
> us an IPv6 address. Am I correct in this train of thought? Why/Why not?
>
> In regards to core loopback addressing my initial thoughts are as follows:
> Assign a single /64 encompassing all /128’s planned for loopback
> addressing schemes. Should I be using Unique Local addressing for loopbacks
> instead of going with a Globally routeable addressing scheme? Should each
> interface IP configuration have a /64 or a /128?
>
> Also when talking about CPE mgmt addresses what do you think is a
> practical way of going about assigning “Private” addressing schemes for cpe
> management purposes.
>
> I’m sure some of these questions will be answered when I dive deeper into
> how OSPFv6 works as well as BGP in regards to IPv6.
>
> Are any of you currently running IPv6 and wished you had done something
> differently during the planning phase that may have prevented headaches
> down the road?
>
>
>
>
> Kody Vicknair
> Network Engineer
>
>
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