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 <http://tools.ietf.org/html/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
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