Library items tagged: IP address assignment

Subnetting examples

Anonymous
Monday, February 13, 2012 - 07:52
IP address assignment
Services
subnetting
What is Subnetting Subnetting is a way of partitioning a network at the IP level by dividing a block of addresses into a number of smaller sets. To understand what is happening, first look at some small numbers rather than a full IP address. Take the set of 'addresses' 100 to 129. If computers used decimal representation, this network of 30 addresses might naturally be split into: 100 - 109 110 - 119 120 - 129 The first two digits represent the subnet number (10,11,12), while the final digit gives the address within the subnet.
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Private IP addresses and network address translation

Anonymous
Friday, February 10, 2012 - 14:37
IP address assignment
NAT
network address translation
private IP addresses
Services
The use of private addressing and NAT permits even fairly large organisations to make the best use of a small block of addresses allocated from the globally unique IP address space, and assists in conserving this limited Internet resource.
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IP subnet addressing

Anonymous
Friday, February 10, 2012 - 14:36
services
IP address assignment
IP subnet addressing
The subnetting of IP addresses can help to make better use of IP address space, for example on expansion of a network. It also allows IP addresses on networks to be divided into multiple smaller networks or subnets. The addresses for the subnets are derived from the main network address by applying a subnet mask, and as such belong to that organisation. Effective use of subnets may remove the need to obtain additional address space. Subnets also provide some advantages over one large network:
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Reverse delegations

Anonymous
Friday, February 10, 2012 - 14:34
IP address assignment
reverse delegation
Services
Janet is responsible for reverse delegations within the Janet IP address space, as allocated by the RIPE NCC. Therefore, Janet will undertake delegations within the following zones:
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Assignment of IP address space

Anonymous
Friday, February 10, 2012 - 14:33
IP address assignment
IP address space
Services
Janet customers in the process of connecting to the network apply for IP addresses using the web-based JCUR. FE and specialist colleges and PCDL centres may enlist the help of their JISC RSC in completing the form.
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Internet registries

Anonymous
Friday, February 10, 2012 - 14:31
IP address assignment
internet registry
Services
ICANN, based in the USA, controls the global allocation of IP address space. This body has allocated blocks of IP addresses to five Regional Internet Registries, one of which is RIPE NCC. Janet and other networks in Europe may apply to RIPE NCC for IP address space.
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Classless IP addresses

Anonymous
Friday, February 10, 2012 - 14:29
services
IP address assignment
classless IP addresses
The method of allocating address space according to need is known as CIDR. Further information about this strategy may be found in RFC 1519, Classless Inter-Domain Routing (CIDR): an Address Assignment and Aggregation Strategy.
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