Fw: ipv6 newbie question

Jack Stonebraker Jack.Stonebraker at mygrande.com
Wed Jan 29 18:10:11 UTC 2014


We do a /64 allocation which is reserved for each point to point link, but then subnet it to a /126 for actual use.  That way we've got a /64 available if it's ever needed, while keeping the broadcast domain small for now when we don't.

JJ Stonebraker
IP Network Engineering
Grande Communications

-----Original Message-----
From: Justin M. Streiner [mailto:streiner at cluebyfour.org] 
Sent: Wednesday, January 29, 2014 8:44 AM
To: NANOG list
Subject: Re: Fw: ipv6 newbie question

On Wed, 29 Jan 2014, Nick Hilliard wrote:

> On 29/01/2014 17:35, Philip Lavine wrote:
>> Is it best practice to have the internet facing BGP router's peering ip
>> (or for that matter any key gateway or security appliance) use a
>> statically configured address or use EUI-64 auto config?
> how are you going to set up the bgp session from the remote side to an
> eui-64 auto configured address on your side?
> best use static here.  And make sure to disable RA (with fire, i.e. disable
> send + receive + answering solicited requests) and EUI64.  If it's a point
> to point link, use a /126 or /127 netmask.

+1.  I've seem some providers do /64 on their point-to-point links.  I 
don't have an issue with that, and the whole /64 vs /126 or /127 debate 
has been thoroughly beaten into the ground.  No need to re-hash it.

I have never seen a provider use a pseudo-dynamic address on an 
interface/BGP peer.  Having to reconfigure a BGP session because a 
provider did a hardware upgrade or moved my link to a new interface would 
not make me happy.


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