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" <[email protected]> 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 <[email protected]>: >> 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 <[email protected]>: >>> * 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 >
