[195726] in North American Network Operators' Group
Re: IPv6 Loopback/Point-to-Point address allocation
daemon@ATHENA.MIT.EDU (Baldur Norddahl)
Sun Sep 10 04:47:40 2017
X-Original-To: nanog@nanog.org
In-Reply-To: <3979AE529B56AB47942E2423B707F16E64C27570@RTC-EXCH01.RESERVE.LDS>
From: Baldur Norddahl <baldur.norddahl@gmail.com>
Date: Sun, 10 Sep 2017 00:09:14 +0200
To: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
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@reservetele.com>:
> All,
>
> I=E2=80=99ve been doing some reading in preparation of IPv6 deployment an=
d
> figuring out how we will break up our /32. I think I=E2=80=99m on the rig=
ht track
> in thinking that each customer will be allocated a /48 to do whatever the=
y
> wish with it.
>
> I=E2=80=99ve 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 o=
n
> 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 bein=
g
> Globally routable. This seems to be what our IX providers do when assigni=
ng
> 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=E2=80=99s planned for loopback
> addressing schemes. Should I be using Unique Local addressing for loopbac=
ks
> 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 =E2=80=9CPrivate=E2=80=9D addressi=
ng schemes for cpe
> management purposes.
>
> I=E2=80=99m sure some of these questions will be answered when I dive dee=
per 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
>
>
> [cid:imagebf3343.JPG@c9d2fbd2.4db10e0d] <http://www.rtconline.com=
>
>
> Tel: 985.536.1214
> Fax: 985.536.0300
> Email: kvicknair@reservetele.com
> Web: www.rtconline.com
>
> Reserve Telecommunications
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>
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