barcode vb.net code Mapping Names into Addresses and Vice Versa in Objective-C

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To map names into addresses and vice versa, the decision was to adopt what was defined by the standard POSIX 10031g (Protocol Independent Interfaces)15 that is, getaddrinfo() functions (for mapping names into addresses) and getnameinfo() functions (for mapping addresses into names) These two functions were designed by IEEE to be independent from the protocol and are therefore suitable to meet IPv6 needs
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Each time we need to interact with human users, we need to translate an address s numerical format into a textual format or vice versa To do so, we can use the two new library functions that have been defined:
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inet_pton() (from a textual format to numerical a format) inet_ntop() (from a numerical format to a textual format)
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211 Domain Name Service (DNS) Modifications
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The calls to functions getaddrinfo() and getnameinfo() cannot be executed if the Domain Name Service is not upgraded, allowing it to store IPv6 addresses First, a new type of record AAAA 16 has been added The name of this new record (AAAA) was derived from the one used to memorize IPv4 (A) addresses; because IPv6 addresses are four times bigger than IPv4 addresses (128 bits instead of 32), the decision was to use four A s Therefore, if, in DNS, we write configuration files mapping from the name into the IPv4 address as
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HOST1POLITOIT IN A 130192253252
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we write the same operation from the name into the IPv6 address as
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HOST1POLITOIT IN AAAA 4321:0:1:2:3:4:567:89ab
The DNS must also provide opposite definitions that is, of mapping addresses into names To define the mapping from an IPv4 address into a name, we use a PTR record, for example, with reference to the previous case:
252253192130IN-ADDRARPA PTR HOST1POLITOIT
Because the ARPA domain is obsolete, it has been decided to define the second layer IP6 domain under the first layer INT domain With reference to the preceding example, the rule to map an IPv6 address into the corresponding name is as follows:
ba9876504000300020001000000012 34IP6INT PTR HOST1POLITOIT
An Overview of IPv6
DHCP Servers
In practice, the length of IPv6 addresses makes their use by end users impossible End users will work on IPv6 using only names, and these names will be converted into addresses by DNSs Also, network managers will be confronted with the addresses lengths, so they must adopt the necessary support tools for the network configuration In particular, configuring IPv6 addresses not directly on hosts, but on DHCP (Dynamic Host Configuration Protocol)17 servers, will become common Hosts, when bootstrapping, will interact with DHCP servers to configure their addresses and their prefixes (the subnetworks) In practice, DHCP servers are databases that contain relationships between link addresses (typically LANs MAC addresses) and IPv6 addresses, whereas DNS servers contain relationships between IPv6 addresses and names Because both types of servers (DNS and DHCP) will be practically mandatory with IPv6 and because both of them share IPv6 addresses, integrated solutions for DHCP and DNS servers based on a common database should be preferred
REFERENCES
J Postel, RFC 791: Internet Protocol, September 1981 IS 8473, Information processing systems Data communications Protocol for providing the connectionless-mode network service, ISO, 1988 S Deering, R Hinden, RFC 1883: Internet Protocol, Version 6 (IPv6) Specification, December 1995 S Gai, PL Montessoro, P Nicoletti, Reti Locali: dal Cablaggio all Internetworking, SSGRR (Scuola Superiore G Reiss Romoli), 1995 R Hinden, S Deering, RFC 1884: IP Version 6 Addressing Architecture, December 1995 S Thomson, C Huitema, RFC 1886: DNS Extensions to support IP version 6, December 1995 G Bennett, Designing TCP/IP Internetworks, Van Nostrand Reinhold G Malkin, RFC 1723: RIP Version 2 Carrying Additional Information, November 1994 J Moy, RFC 1583: OSPF Version 2, March 1994
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DC Plummer, RFC 826: Ethernet Address Resolution Protocol: On converting network protocol addresses to 48 bit Ethernet address for transmission on Ethernet hardware, November 1982 T Narten, E Nordmark, W Simpson, RFC 1970: Neighbor Discovery for IP Version 6 (IPv6), August 1996 A Conta, S Deering, RFC 1885: Internet Control Message Protocol (ICMPv6), December 1995 J Postel, RFC 793: Transmission Control Protocol, September 1981 RE Gilligan, S Thomson, J Bound, Basic Socket Interface Extensions for IPv6, IETF, April 1996 IEEE, Protocol Independent Interfaces, IEEE Std 10031g, DRAFT 63, November 1995 S Thomson, C Huitema, RFC 1886: DNS Extensions to support IP version 6, December 1995 R Droms, RFC 1541: Dynamic Host Configuration Protocol, October 1993
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