On Oct 12, 2010, at 7:02 PM, Mark Andrews wrote: > > In message <992DF93E-1EFB-4D68-BDD7-D5C7BE02FC01@xxxxxxxxxxxxxx>, Marshall Euba > nks writes: >> Hello; >> >> I think that people here would be interested in (and likely >> concerned by) the ARIN 2010-9 proposal : >> >> https://www.arin.net/policy/proposals/2010_9.html >> >> "On 15 July 2010 the ARIN Advisory Council (AC) selected "IPv6 for 6rd" >> as a draft policy for adoption discussion on the PPML and at the >> Public Policy Meeting in Atlanta in October. >> >> IPv6 for 6rd >> >> 6rd is an incremental method for Service Providers to deploy IPv6, >> defined in the IETF Standards Track RFC 5969. 6rd has been used >> successfully by a number of service providers to deploy IPv6 based >> on automatic IPv6 prefix delegation and tunneling over existing IPv4 >> infrastructure. .... " >> >> What worries me (and others) is that to give end >> users an IPv6 /56 will generally require the assignments as short as /24s >> to ISPs, due to the encapsulation of v4 addresses inside of v6 addresses : >> >> "The 6rd prefix is an RIR delegated IPv6 prefix. It must encapsulate >> an IPv4 address and must be short enough so that a /56 or /60 can be >> given to subscribers." >> >> 56 - 32 = a /24 > > Only a naive deployment of 6rd would do this. Maybe so, but I was just quoting from the ARIN draft. Regards Marshall > > If you deploy a 6rd prefix per IPv4 prefix you have allocated and > set appropriate IPv4 mask lengths in your DHCP replies to the 6rd > option request then you have as many /56 as you have IPv4 addresses. > Round up to the next power of 2 and you have the amount of address > space you need to get from your RIR to support your 6rd deployment. > > See RFC 5969. > > Most ISP's IPv4 address allocations all fall within one or two /8. > That gives a /32 per containing 8 if you a IPv4MaskLen of 8. > > Mark > -- > Mark Andrews, ISC > 1 Seymour St., Dundas Valley, NSW 2117, Australia > PHONE: +61 2 9871 4742 INTERNET: marka@xxxxxxx > _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf