I would (did) argue that the issue isn't reachability... On Apr 30, 2010, at 6:30 AM, Keith Moore wrote:
> I agree that the concept of ??? (reachability boundaries?) needs a name. > > Keith >> Fine. The concept I described is relevant, even if (as both Brian and I >> point out) it is not the same as the one RFC 2663/3103 talk about. We'll use >> a different word so you don't have to worry about it. >> >> On Apr 30, 2010, at 6:14 AM, Keith Moore wrote: >> >>> Even if one accepts the need for v6-v6 NAT (I do not) that's still not a >>> justification for IPv6 addressing realms. >>>> Look at the "cc" line of this email. >>>> >>>> On Apr 30, 2010, at 3:11 AM, Keith Moore wrote: >>>> >>>>> Why is there a need for such a concept as "IPv6 realm"? >>>>> >>>>> It seems to me that if we ever create IPv6 realms in the sense that >>>>> realms exist in IPv4 (i.e. if we make IPv6 addresses ambiguous), we've >>>>> irrevocably broken IPv6. >>>>> >>>>> And if we end up creating a subtly different concept in IPv6 - something >>>>> like realms without the potential for address assignment conflicts - it >>>>> will be confusing to call such things realms. >>>>> >>>>> But I really think the right thing to do is to make explicit that there >>>>> is only one "realm" for the entire IPv6 address space. >>>>> >>>>> Keith >>>>>> We got a definition for "IPv4 realm", based on RFC 2663 (but also RFC >>>>>> 3103). >>>>>> Both RFC's are IPv4 oriented, not providing an explicit definition for >>>>>> an "IPv6 realm". >>>>>> >>>>>> This question might be related to NAT66, because the IPv4 realm concept >>>>>> is originating from NAT44. >>>>>> >>>>>> Does anyone know a correspondent definition/reference for IPv6 realm? >>>>>> >>>>>> If not, I'd like to offer an initial proposal for discussion, - a common >>>>>> realm term for IPv4 and IPv6: >>>>>> >>>>>> (IPv4 or IPv6 address) realm: is defined as a set of addresses, which >>>>>> share all a common prefix, that are mutually reachable (thus, within a >>>>>> single IP routing domain). >>>>>> >>>>>> Note: "IPv6 realm" definition based on the GLOBAL UNICAST ADDRESS format >>>>>> (ยง 2.5.4/RFC 4291) because this is a hierarchical format using a "global >>>>>> routing prefix", which is assigned to a "site" (i.e. sth like a REALM). >>>>>> Comments would be appreciated, >>>>>> Albrecht >>>>>> _____ >>>>>> RFC 2663 IP Network Address Translator (NAT) Terminology and >>>>>> Considerations >>>>>> 2.1. Address realm or realm >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> An address realm is a network domain in which the network addresses >>>>>> are uniquely assigned to entities such that datagrams can be routed >>>>>> to them. Routing protocols used within the network domain are >>>>>> responsible for finding routes to entities given their network >>>>>> addresses. Note that this document is limited to describing NAT in >>>>>> IPv4 environment and does not address the use of NAT in other types >>>>>> of environment. (e.g. IPv6 environments) >>>>>> >>>>>> >>>>>> RFC 3103 Realm Specific IP: Protocol Specification >>>>>> 3. Terminology >>>>>> Private Realm >>>>>> >>>>>> A routing realm that uses private IP addresses from the ranges >>>>>> (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) specified in >>>>>> [ >>>>>> RFC1918 >>>>>> ], or addresses that are non-routable from the Internet. >>>>>> >>>>>> Public Realm >>>>>> >>>>>> A routing realm with unique network addresses assigned by the >>>>>> Internet Assigned Number Authority (IANA) or an equivalent address >>>>>> registry. >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> nat66 mailing list >>>>>> >>>>>> [email protected] >>>>>> https://www.ietf.org/mailman/listinfo/nat66 >>>>> _______________________________________________ >>>>> nat66 mailing list >>>>> [email protected] >>>>> https://www.ietf.org/mailman/listinfo/nat66 >>>> >>>> http://www.ipinc.net/IPv4.GIF >>>> >>>> _______________________________________________ >>>> nat66 mailing list >>>> [email protected] >>>> https://www.ietf.org/mailman/listinfo/nat66 >> >> http://www.ipinc.net/IPv4.GIF >> http://www.ipinc.net/IPv4.GIF
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