![]() ![]() This solves the same problems that are solved by shared addresses, and eases the administrative burden of the provider having to assign and manage both an IPv4 address and an IPv6 address on every link. However, this is only a proposed solution and no IPv4 address blocks have yet been reserved for shared address use.Īn alternative to using IPv4 shared addresses between the provider and the customers is to use IPv6 addresses. The proposed solution is to reserve a block of the remaining IPv4 addresses to be used as “shared addresses” that do not overlap with RFC1918 addresses and will not encounter filtering problems when routing between customers behind the same LSN. But as explained in the previous article, there are concerns with using RFC1918 addresses on the customer links: Overlap between the customer’s RFC1918 addresses and the provider-assigned RFC1918 addresses, and problems with routing between customers behind the same LSN are the main issues here. The existing NATs at the customer network can be used, and the same basic NAT44 functionality is used at the provider’s LSN. NAT444 is the simplest architecture for providing IPv4 addresses on the provider-to-customer links. It is almost always a service on a router rather than a standalone device whether LSNs live up to “carrier grade” performance or scaling expectations is yet to be seen. LSN – the newer, more accurate name for what was previously called Carrier Grade NAT (CGN) – is simply a NAT that is located in a service provider network rather than in a customer network. Although quickly changing, many broadband customers are still running operating systems that either do not support IPv6 or have some shortcomings in their IPv6 support.Almost all services accessible on the public Internet are still IPv4 only.Assigning IPv6 addresses alone is not practical for two reasons: ![]() The focus is primarily on broadband service providers, who must somehow continue to assign addresses to very large numbers of new customers when there are no new IPv4 addresses to use. The previous article examined a couple of basic Large Scale NAT (LSN) architectures – NAT444 and NAT464 – for creating dual stacked networks in the face of a depleted IPv4 address pool. ![]()
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