IPv6 Address Structure in .NET framework

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IPv6 Address Structure
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IPv6 addresses are 128 bits long [RFC 2373] The format prefix, a variable number of the most significant bits, identifies the format of a specific address instance (Table 526) We are concerned here with the allocation of globally aggregatable unicast addresses, the 001 prefix addresses
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Administration, Addressing, and Naming Table 527 Fields of Unicast Address Format FIELD ID FP TLA ID RES NLA ID SLA ID INTERFACE ID PURPOSE Format prefix (001) Top-level aggregation identifier Reserved for future use Next-level aggregation identifier Site-level aggregation identifier Interface identifier LENGTH (BITS) 3 13 8 24 16 64
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The Aggregatable Unicast Address
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Aggregatable unicast addresses are designed to support the current type of provider-based aggregation, but also a new, basically geographic, type of aggregation based on exchange points [RFC 2374] The latter is, realistically, experimental, and provider-based aggregation may remain the norm Let s look at the overall structure of the global unicast address format in Table 527
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Top-Level Aggregation Identifiers
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One of the goals [RFC 2460] in assigning 13 bits to the top-level aggregation (TLA) is to be certain that the default-free routing table stays within current router capabilities A length of 13 bits allows for 8,192 TLA IDs The idea is that a router in the default-free zone (the area within which there are no default routes; all possibilities are known) will have a RIB that contains all assigned TLAs, plus more-specific routes inside its own routing domain (See Figure 518) At the time the 13 bit TLA size was selected, the typical IPv4 DFZ routing table had 50,000 routes While the table has roughly doubled at the time of this writing (June 2001), when the TLA was sized there were serious questions about whether 50,000 routes was above the threshold of reasonable routing stability This concern still exists The problem is not purely the number of best routes selected by the route selection algorithm (see 9), but the reality that there may be 10 to 15 instances of every route The more instances, the more the table changes and churns, both of which put more workload on processors and cause even more bandwidth to be consumed by BGP announcements Designers of the initial TLA structure did think about improved routing technology that might make larger DFZ tables more practical Remember that the Reserved field is between the TLA and next-level aggregation (NLA), so either
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Default-Free Zone All TLAs Visible DFZ Router Own NLA and Below DFZ Router Own NLA and Below
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Figure 518 DFZ IPv6 router relationships
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the TLA field can expand to the right or the NLA field can expand to the left The alternative to using parts of the Reserved field is to allocate additional format prefix(es) for aggregatable unicast addresses Table 527 shows that many prefixes have not yet been assigned Besides the technical goals of keeping the top-level routing table manageable, there are other operational and organizational guidelines for the assignment of TLAs TLAs will only be assigned to transit providers and exchanges They are not intended as a means of creating provider-independent address space for enterprise multihoming; IPv6 has other mechanisms for that purpose Initial allocation will be conservative IANA will directly assign small blocks of TLA IDs to registries, and also may directly assign TLAs for experimental use or new applications such as exchange-based allocation The registries will first assign a sub-TLA ID (see Sub-TLAs later in this chapter) and will only assign a full TLA when the recipient demonstrates it has assigned more than 90 percent of the space Recipients will not need to return or renumber their subTLAs Organizations receiving TLAs will do so with the understanding that they do not own them, as is the practical case with IPv4 allocations TLA recipients are considered the stewards of a common resource The recipients need to meet an assortment of qualifications to keep their role of stewardship First, they must have the will and the technical capability to offer native IPv6 transit services (for example, running IPv6 over a sub-IP or data-link protocol, not a tunnel) within 3 months of the assignment Registries will want to see a specific plan, including details of allocation and registration procedures and the availability of a public database with this information We are just beginning to learn the operational realities of IPv6, and we want only serious players to have TLAs This is quite consistent with current IPv4 practice of justifying the need for addresses It also avoids the ugly equivalent of domain squatting and other DNS speculation
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