Library items tagged:

IP subnet addressing

Anonymous

Friday, February 10, 2012 - 14:36

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:

Hardware addresses

Anonymous

Friday, February 10, 2012 - 14:35

services

IP address delegation

hardware addresses

Computers have a unique hardware address that is allocated to the network interface when the machine is manufactured. When a computer is connected to a LAN, the Address Resolution Protocol provides a mapping of IP addresses to the hardware or MAC address.

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:

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.

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.

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.

Joining the Network Time Service

Anonymous

Friday, February 10, 2012 - 14:15

Services

joining

network time

A Janet organisation wishing to use the service must complete and submit an on-line application form Once the application has been received, it will have to be approved and the applicant will be notified of the result within five working days.

Technical information

Anonymous

Friday, February 10, 2012 - 14:14

network time

Services

Technical Information Introduction to NTP NTP on Unix systems Fetching and building the NTP software NTP on non-Unix systems Your own clock

Janet txt

Anonymous

Friday, February 10, 2012 - 09:17

sms

txt

All Janet services are governed by the Janet policies. Cost: There are no set up fees or recurring charges for the basic service. All messages are charged at 3.7 pence (+ VAT) per message sent. SMS Messages are purchased in blocks and are valid for 12 months from the order date. For a full listing of Janet txt pricing, contact us