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Classless Inter-Domain Routing (CIDR / ˈ s aɪ d ər, ˈ s ɪ-/) is a method for allocating IP addresses for IP routing.The Internet Engineering Task Force introduced CIDR in 1993 to replace the previous classful network addressing architecture on the Internet.
In order to address the issues of address space and other factors, Cisco created EIGRP (Enhanced Interior Gateway Routing Protocol). EIGRP adds support for VLSM (variable length subnet mask) and adds the Diffusing Update Algorithm (DUAL) in order to improve routing and provide a loopless environment.
As in IPv4, subnetting in IPv6 is based on the concepts of variable-length subnet masking (VLSM) and the Classless Inter-Domain Routing methodology. It is used to route traffic between the global allocation spaces and within customer networks between subnets and the Internet at large.
There are plenty of online network calculators, and the two ones in the external links are quite limited in functionalities. How about adding this one.--Olivier Debre 07:45, 14 April 2006 (UTC) []
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English: VLSM chart, shows the different possible subnets with masks larger than /24. Helps to find the network, netmask and host addresses. Helps to find the network, netmask and host addresses. Español: Tabla VLSM, muestra las diferentes subredes posibles con máscaras mayores a /24.
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