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Topic: IPv4 address shortage

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IP address allocation

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	IPv4 address exhaustion - Biocrawler (Site not responding. Last check: 2007-10-25)
		As the number of Internet-connected devices increases, the address space of the current IPv4 version of the TCP/IP protocol suite is rapidly being consumed by allocations for new devices.
		For both administrative and technical reasons (the latter in large part being related to routing), IPv4 addresses are allocated in blocks which are restricted to sizes which are powers of 2; this leads to many addresses being unused at any given time.
		The top-level unit of allocation of IPv4 addresses is the /8 block, a unit of approximately 16 million addresses.
	www.biocrawler.com /encyclopedia/IPv4_address_exhaustion (719 words)

	Science Fair Projects - IPv4
		IPv4 uses 32-bit addresses, limiting it to 4,294,967,296 unique addresses, many of which are reserved for special purposes such as local networks or multicast addresses, reducing the number of addresses that can be allocated as public Internet addresses.
		As the number of addresses available is consumed, an IPv4 address shortage appears to be inevitable in the long run.
		When a large IPv4 packet is split up into smaller fragments (which is usually, but not always, done at a router in the middle of the path from the source to the destination), the fragments are all normal IPv4 packets; i.e.
	www.all-science-fair-projects.com /science_fair_projects_encyclopedia/IPv4 (1397 words)

	IPv4 - Wikipedia, the free encyclopedia
		IPv4 uses 32-bit addresses, limiting it to 4.294.967.296 unique addresses, many of which are reserved for special purposes such as local networks or multicast addresses, reducing the number of addresses that can be allocated as public Internet addresses.
		IPv4 addresses are usually written in Dot-decimal notation.
		When a large IPv4 packet is split up into smaller fragments (which is usually, but not always, done at a router in the middle of the path from the source to the destination), the fragments are all normal IPv4 packets; i.e.
	en.wikipedia.org /wiki/IPv4 (1301 words)

	IPv4 (Linux Reviews)
		IPv4 â¢ IPv6) â¢ ARP â¢ RARP â¢ ICMP â¢ IGMP â¢ RSVP â¢ IPSec â¢ â¦
		IPv4 is a data-oriented protocol to be used on a packet switched internetwork (e.g., Ethernet).
		Note that this address may not be the "true" sender of the packet due to network address translation.
	www.linuxreviews.org /dictionary/IPv4 (3703 words)

	Network address translation - Open Encyclopedia (Site not responding. Last check: 2007-10-25)
		In computer networking, network address translation (NAT, also known as Network masquerading or IP-masquerading) is a technique which relies on rewriting IP addresses of network packets passing through a router or firewall.
		NAT became popular because of the IPv4 address shortage.
		Other computers on the local network (eth0) need to set the IP address of the masquerading box as their gateway.
	open-encyclopedia.com /NAT (1035 words)

	Transition from IPv4 to IPv4 (Site not responding. Last check: 2007-10-25)
		The address in the IPv6 packet that has been tunneled cannot provide the address of the IPv4 tunnel endpoint because when tunneling is done, it is to a router from either a router or a host: the endpoint of the tunnel is different from the destination of a packet that has been tunneled.
		The tunnel’s endpoint address is taken the IPv4 address of an IPv6/IPv4 router bordering the IPv6 backbone.
		Using this address when the traffic is passed the device at the tunnel entry point it automatically understands the encapsulated address by converting the compatible address to 32 bit IPv4 address, On the receiver side, the IPv4 address is removed to obtain an IPv6 address.
	ug.cs.dal.ca /~karimi/IPv6 (3238 words)

	IP Addressing (Site not responding. Last check: 2007-10-25)
		IPv4 addresses are made up of 32 bits of information which means that there are 2^32 or 4.2 billion addresses available.
		The address shortage problem is aggravated by the fact that portions of the IP address space have not been efficiently allocated.
		The long term solution to the shortage problem is an upgrade known as IP version 6 (IPv6), a protocol upgrade that tackles the shortage head-on by expanding the address space from 32 to 128 bits which in turn vastly increases the number of available addresses.
	home.insightbb.com /~jennyboice/IPAddressing.htm (1393 words)

	IPv4 Address Space: October 2003
		When IPv4 address space finally "runs out" this will occur at the global level, leaving each region with a relatively small pool of addresses remaining to be allocated.
		This is because addresses are distributed in a co-ordinated fashion from a single global pool, and there is no system whereby that pool is exclusively divided among, or pre-allocated to, different countries or regions.
		Through the current system of address administration, IP addresses are allocated according to immediate need wherever that need is demonstrated and it is simply not possible for isolated "shortages" to exist.
	www.ripe.net /rs/news/ipv4-ncc-20031030.html (605 words)

	IPv4 address exhaustion (Site not responding. Last check: 2007-10-25)
		As the number of Internet-connected devices rises, the address space of the current IPv4 version of the TCP/IP protocol suite is rapidly being consumed by allocations for new devices.
		The hierarchical allocation of addresses, which is necessary for both administrative and routing purposes, leads to many addresses being unused at any given time.
		The top-level unit of allocation of IPv4 addresses is the /8 block, a unit of approximately 16 million addressses.
	www.sciencedaily.com /encyclopedia/ipv4_address_exhaustion (604 words)

	Network address translation - the free encyclopedia (Site not responding. Last check: 2007-10-25)
		In computer networking, network address translation(NAT, also known as network masquerading or IP-masquerading) is a technique in which the source and/ordestination addresses of IP packets are rewritten as they pass through arouter or firewall.
		In a typical configuration, a local network uses one of the designated "private" IP address subnets (such as 192.168.x.x or 10.x.x.x), and a router on that network has a privateaddress (such as 192.168.0.1) in that address space.
		Some internet service providers only provide their customerswith "local" IP addresses, and they must access services external to the ISP's network through NAT, and a discussion has arisenas to whether such companies can properly be said to provide "Internet" service.
	www.encyclopedia-of-knowledge.com /?t=NAT (1000 words)

	The IPv4 address crisis
		Subnetting is the process of splitting a network portion of an IP address, which allows an administrator to partition or divide a network without having to use a new address for each network partition.
		The basic idea is to take the IP address, which is divided into a network portion and a host portion, and then to divide it further by adding a third part, the subnet number.
		The remaining "1" bits in the mask indicate the bits in the address that are the subnet part of the address.
	retea.20megsfree.com (1262 words)

	[LACNIC/Anuncios] Espacio Direcciones IPv4
		IPv4 Address Space: Allocated Globally According to Regional Needs ================================================== The RIRs are not-for-profit membership organisations dedicated to providing neutral and fair Internet resource distribution to their members, while ensuring the conservation and aggregation of IPv4 address space.
		When IPv4 address space finally "runs out" this will occur at the global level, leaving each region with a relatively small pool of addresses remaining to be allocated.
		This is because addresses are distributed in a co-ordinated fashion from a single global pool, and there is no system whereby that pool is exclusively divided among, or pre-allocated to, different countries or regions.
	www.lacnic.net /pipermail/anuncios/2003-November/000073.html (2176 words)

	Network address translation - Wikipedia, the free encyclopedia
		Network address translation (NAT, also known as Network masquerading or IP-masquerading) is a technique used in computer networking, which relies on rewriting IP addresses of network packets passing through a router or firewall.
		Use of NAT is particularly compelling in countries other than the United States, which have fewer address blocks allocated per capita for historical reasons.
		NAT with port-translation can be further distinguished to two kinds: source address translation (source NAT), where the IP address of the computer which initiated the connection is rewritten, and its counterpart: destination address translation (destination NAT).
	www.encyclopedia-online.info /NAT (919 words)

	ipv4 (Site not responding. Last check: 2007-10-25)
		IPv4 is version 4 of the Internet Protocol (IP).
		As the number of addresses available is consumed, an IPv4 address shortage appears to be inevitable in the long run.
		This limitation has helped stimulate the push towards IPv6, which is currently in the early stages of deployment, and is expected to eventually replace IPv4.
	www.yourencyclopedia.net /IPv4.html (179 words)

	[No title]
		IP routing protocols interpret IPv4 addresses as locators and construct routing tables based on which routers (which have their own locators) claim to know a route towards the locators of particular hosts.
		Generally speaking, the use of IPv4 addresses as locators has been considered more important than their use as identifiers, and whenever there has been a conflict between the two uses, the use as a locator has prevailed.
		Addresses are no longer all temporally unique Note that as soon as address significance changes anywhere in the address space, it has in some sense changed everywhere.
	www.ietf.org /rfc/rfc2101.txt (3996 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: 2007-10-25)
		An IP address (Internet Protocol address) is a unique address that certain electronic devices use in order to identify and communicate with each other on a computer network utilizing the Internet Protocol standard (IP)—in simpler terms, a computer address.
		An IP address can also be thought of as the equivalent of a street address or a phone number (compare: VoIP (voice over (the) internet protocol)) for a computer or other network device on the Internet.
		This reduces the number of addresses that can be allocated as public Internet addresses, and as the number of addresses available is consumed, an IPv4 address shortage appears to be inevitable in the long run.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=IP_address (786 words)

	Ammas.com's Ask Agent -- The Search Engine for Intelligent Life
		IPv4 users work around shortages of addresses in various ways, for example by using network address translation, which allows more than one organisation to use the same address.
		Current IPv4 addresses are 32 bits in length (initially they thought that Internet would be used by the military and researchers only), the move to IPv6 represents an exponential increase in the number of possible addresses, which are 128 bits in length with the new version (thereby opening infinite pool of IP addresses).
		Drawback of IPv4 is that it restricted addressing space with uneven geographic distribution with 74% of addresses was allocated to North America, 17% to Europe and 9% to Asia.
	askagent.ammas.com /topics/Business/a99485.html (3320 words)

	Home
		The current version of IP is version 4 (IPv4), which was formally standardized in 1981 and is used in most IP-based networks including the Internet today.
		IPv4 uses a 32-bit addressing scheme, which gives it 4 billion possible addresses.
		Many features of IPv4 remain in the new protocol, and the two can coexist during the transition to a complete IPv6 internetworking environment.
	www.nimsassociates.com /events/notes.asp?noteID=67 (395 words)

	Geek Style: IPv4 address space - Not so critical issue (Site not responding. Last check: 2007-10-25)
		RIPE Reports: Based on today’s total global allocation rate of approximately 4.25 blocks per year in 2002, or 5.5 blocks in 2001, and the remaining pool of 91 blocks held by IANA, it is unrealistic to assume that there is...
		Based on today’s total global allocation rate of approximately 4.25 blocks per year in 2002, or 5.5 blocks in 2001, and the remaining pool of 91 blocks held by IANA, it is unrealistic to assume that there is an imminent shortage in the IPv4 address space.
		Given the fact that migrating to IPv6 is a real pain for many networks (Lack of software, hardware and knowledge), I think many providers will stick with old IPv4 for a long time, and IPv4 will remain as main internet protocol while IPv6 operates as a secondary protocol for modern devices and applications.
	farrokhi.net /blog/archives/000219.html (246 words)

	Contenu en lecture (Site not responding. Last check: 2007-10-25)
		The addresses allocated (intended for use by a regional register or pre-RIR organisations) represent most of the stock and are intended primarily for the American region at the expense of Asia, despite its major development potential (China, India).
		The publication of the addresses assigned by the RIR, the absence of property rights to assigned IP addresses and the supervision of transfers between registers of the allocated addresses are all an effort to better manage IPv6 addresses.
		The recovery of unused addresses does not appear to be a truly effective means of delaying the shortage of IPv4 addresses: legal mechanisms for recovering addresses exist in theory although the RIPE do not appear to use them.
	www.art-telecom.fr /index.php?id=8455&L=1&tx_gspublication_pi1[typo]=4&tx_gspublication_pi1[uidDocument]=201&cHash=32e6f365f0 (4899 words)

	APNIC hot topics - Internet governance in China (Site not responding. Last check: 2007-10-25)
		This was a period when address conservation was not seen as a priority and during the 1980s and into the early 1990s many large organisations, most of them in the United States, were assigned /8 address blocks.
		The allocation of address space to RIRs from the IANA, and to ISPs from the RIRs (sometimes via National Internet Registries, or NIRs, in the APNIC region) is a continual process, and all allocations are made according to demonstrated need under a consistent set of policies.
		There is no preallocation of addresses to any economy or region in the world, meaning that a 'shortage' in any one country or economy simply cannot happen, except (and in theory only) as a result of specific national circumstances, of a type which do not appear to exist in China.
	www.apnic.net /news/hot-topics/internet-gov/ip-china.html (931 words)

	Don't panic, but be ready to adopt IPv6 - 28/Apr/2003 - ComputerWeekly.com
		IPv4 users work around shortages of addresses in various ways, for example by using network address translation, which allows more than one organisation to use the same address.
		Address space conservation methods entail some reduction in application flexibility and user security, plus extra expense and complexity.
		The limited IPv4 address allocation for Japan was beginning to hinder new applications from emerging and that is why Japan had to be the earliest adopter of IPv6."
	www.computerweekly.com /Articles/2003/04/28/194076/Don'tpanic%2cbutbereadytoadoptIPv6.htm (1406 words)

	Virtual Server via NAT (Site not responding. Last check: 2007-10-25)
		Due to the shortage of IP address in IPv4 and some security reasons, more and more networks use internal IP addresses (such as 10.0.0.0/255.0.0.0, 172.16.0.0/255.240.0.0 and 192.168.0.0/255.255.0.0) which cannot be used in the Internet.
		Network address translation is a feature by which IP addresses are mapped from one group to another.
		Then, the destination address and the port of the packet are rewritten to those of the chosen server, and the packet is forwarded to the server.
	www.linuxvirtualserver.org /VS-NAT.html (952 words)

	Slashdot \| IP Address Shortage
		Address classes have been gone for a while...
		On the other hand, the only sane way to give every gadget, appliance, outlet and lightswitch in a house its own IP address is to use the 10.0.0.0/8 network, so it's not an issue for the rest of the world.
		IPv4-compatible address space was built-in, and the protocol itself is meant to allow hosts to inter-communicate between IPv4 and IPv6 hosts on mixed networks.
	slashdot.org /articles/99/05/12/1848216.shtml (1450 words)

	4. IP Addresses
		At present IPv4 is used: see RIPE-324, the RIPE document for IPv4 Address Allocation and Assignment Policies.
		The addresses for the subnets are derived from the main network address by applying a subnet mask, and as such belong to that organisation.
		Since privately addressed nodes on a network do not have a presence on the Internet, there has to be a method by which these addresses are translated to globally routable numbers.
	www.ja.net /services/publications/service-documentation/supportmanual/ip.htm (1183 words)

	Do we really need IPv6? - Detractors say IPv4 address depletion is overblown; boosters point to other benefits - ...
		However, some critics of v6 have claimed that this is all v6 really has to offer in terms of technology, and that even the address shortage issue is overrated.
		The H-ratio base is a concept that presumes that since no network ever uses every single available address, the exhaustion level for usable v4 addresses would occur well before the protocol literally ran out of numerical combinations.
		Bound is especially critical of NAT (network address translation), which is typically used with Ipv4 to dynamically allocate addresses to individual devices sitting behind a router in a LAN.
	www.americasnetwork.com /americasnetwork/article/articleDetail.jsp?id=74319 (525 words)

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