Questions on IPv6 deployment
mhuff at ox.com
Tue Jan 17 21:07:50 UTC 2017
The reason for allocating a /64 for a point to point link is due to various denial of service attack vectors. Just do it. The numbers in IPv6 are staggering. The generally accepted best practice is to allocate a /64 and use a /128 within that /64 for point to point links.
Matthew Huff | 1 Manhattanville Rd
Director of Operations | Purchase, NY 10577
OTA Management LLC | Phone: 914-460-4039
aim: matthewbhuff | Fax: 914-694-5669
> -----Original Message-----
> From: NANOG [mailto:nanog-bounces at nanog.org] On Behalf Of William
> Sent: Tuesday, January 17, 2017 4:02 PM
> To: Michael Still <stillwaxin at gmail.com>
> Cc: nanog at nanog.org
> Subject: Re: Questions on IPv6 deployment
> On Tue, Jan 17, 2017 at 12:48 PM, Michael Still <stillwaxin at gmail.com>
> > http://nabcop.org/index.php/IPv6_Subnetting
> That's overall good advice. I quibble with a couple of points:
> 1. If you plan to use a /126 on a point to point and can't imagine how
> you would use a /64 on that point to point, don't allocate a /64. Odds
> are that by the time you can imagine some way to use a /64 there, the
> details will require you to assign a new block anyway.
> Why be concerned about resource consumption? Because it's a good
> habit. Don't overdo it, IPv6 is not resource constrained the way IPv4
> is, but shrewd use of available resources is a good habit even when
> resources are plentiful.
> 2. Make all your point to points /124. That will work for all your
> point to points. Serial or ethernet. Even the ethernets which have two
> high-availability routers on both ends along with the failover address
> needing a total of 6 IPs plus 1 for your troubleshooting laptop.
> Configuring /124 every time allows you to standardize your
> configuration, the same way /64 standardizes the netmask on a LAN
> One additional point not brought up:
> Minimum assignment to a customer: /60. Never ever /64 or /128. How
> much more than a /60 you choose as your minimum is up to you. Common
> choices are /56 and /48. But never, ever less than a /60. Your
> customer will want to deploy a /64 to each LAN. And there are so many
> cases where he'll want to deploy more than one LAN.
> I've noticed a lot of hosting providers getting this wrong. Some of
> your customers do create VPNs on their VPC you know.
> Bill Herrin
> William Herrin ................ herrin at dirtside.com bill at herrin.us
> Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>
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