Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks?

[Victor Kuarsingh <victor.kuarsingh () gmail com>]

Dmitry et al,

I found Jeff's following comments to be quite insightful for general
practices.

http://www.networkcomputing.com/ipv6-tech-center/231600717

http://www.networkcomputing.com/ipv6-tech-center/231700160

As for using 127s on P2P links....

He discussed reasoning behind using /64s, concerns related to "waste", ND
exploits and
other points as noted in RFC6164. - directed

Regards,

Victor K

On 11-11-29 7:58 AM, "Dmitry Cherkasov" <doctorchd () gmail com> wrote:

> Thanks to everybody participating in the discussion.
> I try to summarize.
>
> 1) There is no any obvious benefit of using longer prefixes then /64
> in DOCSIS networks yet there are no definite objections to use them
> except that it violates best practices and may lead to some problems
> in the future
>
> 2) DHCPv6 server can use any algorithm to generate interface ID part
> of the address, and EUI-64 may be just one of them that can be useful
> for keeping correspondence between MAC and IPv6 addresses. Yet if we
> use EUI-64 we definitely need to use /64 prefix
>
> 3) Using /64 networks possesses potential security threat related to
> neighbor tables overflow. This is wide IPv6 problem and not related to
> DOCSIS only
>
> There were also notes about address usage on link networks. Though
> this was out of the scope of original question it is agreed that using
> /64 is not reasonable here. BTW, RFC6164 (Using 127-Bit IPv6 Prefixes
> on Inter-Router Links) can be mentioned here.
>
>
> Dmitry Cherkasov
>
>
>
> 2011/11/29 Dmitry Cherkasov <doctorchd () gmail com>:
> > Tore,
> >
> > To comply with this policy we delegate at least /64 to end-users
> > gateways. But this policy does not cover the network between WAN
> > interfaces of CPE and ISP access gateway.
> >
> > Dmitry Cherkasov
> >
> >
> >
> > 2011/11/29 Tore Anderson <tore.anderson () redpill-linpro com>:
> > > * Dmitry Cherkasov
> > >
> > > > I am determining technical requirements to IPv6 provisioning system
> > > > for DOCSIS networks and I am deciding if it is worth to restrict user
> > > > to use not less then /64 networks on cable interface. It is obvious
> > > > that no true economy of IP addresses can be achieved with increasing
> > > > prefix length above 64 bits.
> > >
> > > I am not familiar with DOCSIS networks, but I thought I'd note that in
> > > order to comply with the RIPE policies, you must assign at least a /64
> > > or shorter to each end user:
> > >
> > > http://www.ripe.net/ripe/docs/ripe-523#assignment_size
> > >
> > > --
> > > Tore Anderson
> > > Redpill Linpro AS - http://www.redpill-linpro.com