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A 16-bit length for this field allows 65,535 prefixes per site, which seems sufficient for all but the largest of organizations If more prefixes are needed, additional SLAs can be obtained from the upstream provider A degree of wasted space was accepted when the SLA size was chosen in order to force the length of all prefixes identifying the same site to be the same (48 bits) Having a common length should facilitate changing upstream providers and developing multihoming strategies, although the latter especially are not a solved problem for IPv6
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Finally, the interface ID field is intended to provide unique identification for hosts It is deliberately longer than a 48-bit MAC address, which has been used as a host address in some architectures but has proven to have limitations
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Startup providers are likely to need to renumber their IP space several times during the process of building their businesses They will probably have to start with space assigned by an upstream provider, then get a minimum allocation of their own, then justify subsequent allocations As RIPE puts it:
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When changing upstream providers, an organisation that does not operate an LIR will probably have to renumber their networks and return the formerly used address space to the LIR it was received from Organisations operating an LIR do not depend on others for assigning address space to their own or their customers networks On the other hand, operating an LIR takes up considerable amounts of time and financial resources that should not be underestimated
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Allocations are not necessarily contiguous, so there may be additional renumbering into larger, contiguous spaces that provide better aggregation How should you renumber First, be aware that a great many mechanisms may be affected, unless previous designers and administrators planned to be renumbering-friendly (see Figure 519) Second, draw on industry experience Most people who have done major renumbering with little or no user impact agree that the key is to have a comprehensive database in place This database, at the very minimum, contains thorough current IP and DNS information as well as the physical location of equipment and administrative and technical
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Figure 519 Mechanisms affected by renumbering
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contacts for it The actual renumbering will be carried out by software running against the database Important in a renumbering is what I will call dual-use capabilities These are tools that will work both in the current numbering and in renumbered environments One key tool is getting all hosts to use DHCP, which should be dynamically linked to DNS People often forget that DHCP can give extremely long or permanent leases it isn t just used for address conservation By getting all address assignments into DHCP servers, or functional equivalents such as remote-access servers, you greatly minimize the number of places where you have to make changes for the renumbering to be implemented One challenge is to find hidden IP addresses, such as IP addresses that are hard-coded into applications, into software license managers, and network management tools These tend to be more prevalent in user applications than network infrastructure, although there is one notable case where a major network management package asked for a registered address during installation It then generated a license key from this address and monitored the network for activity by this address If no activity was seen for a prolonged period, the software concluded it was pirated and shut itself down Routers other than those in small and home offices typically have fixed addresses and do not use DHCP In general, you will need to establish new configuration files, merge them into current configurations, and typically bounce interfaces down and up so the new addresses take effect The routing domain will then have to reconverge with these new addresses another argument for using hierarchy in your routing design
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