[c-nsp] IPv6 Unique Local Address Routing Issue

[Xu Hu]

Hi All,
My situation is as below:
CE Router------Edge Router---------Core Router-------Internet
The link between CE Router and Edge Router is using ULA, the link between
Edge Router and Core Router is also using ULA, the link between Core Router
and Internet is using GUA.
Internet Router will give us the default route to Core Router, Core Router
will redistribute the default router to OSPF which is the IGP for our
network, so the CE Router can get the default route.
For the return traffic, the CE router will advertise the prefixes which
will allocate the the hosts to OSPF, then Core Router also learning this
prefixes. Core Router will advertise this prefixes to Internet Router
through BGP.
These prefixes are in the GUA range.

My concerns is that, if we don't configure any GUA in the Edge Router and
Core Router, can we receive the default route from Internet Router, also
for the return traffic, can go outside or not?

Will appreciate for any comments.

Best Regards,
Hu Xu

2012/9/11 Peter Rathlev <peter at rathlev.dk>

> On Mon, 2012-09-10 at 22:45 +0100, Aled Morris wrote:
> > On 10 September 2012 21:56, Mack McBride <mack.mcbride at viawest.com>
> wrote:
> > > If you are using ULA please be sure to use the correct procedure to
> > > generate a /48 and register the /48 subnet with SixXS.  This keeps
> > > ULA unique.
> >
> > Am I the only one to find this a bit of a contradiction in terms?  If
> > you're going to register it, how is it not then a kind of GUA?  Really?
>
> Just make sure the prefix is generated in a sufficiently random fashion
> (RFC4193 3.2.1) and rest assured that the law of large numbers is on
> your side.
>
> SixXS does host a generator that complies with RFC4193 3.2.1. Even
> though GUA is easy to get it's not as easy as pushing a few buttons on a
> webpage.
>
> (What's with the cross posting?)
>
> --
> Peter
>
>
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