Supernetting.ppt - Supernetting Recall subnetting allows an organization to share a single IP network address among multiple physical networks

Supernetting.ppt - Supernetting Recall subnetting allows an...

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Supernetting Recall: subnetting allows an organization to share a single IP network address among multiple physical networks Supernetting (a.k.a. classless addressing ) allows the addresses assigned to an organization to span multiple IP network addresses
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The Original Classful Addressing Scheme
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Classful Addresses The different classes were different sizes: Less than 17,000 class B network addresses More than 2,000,000 class C network addresses The classes differed in popularity: Class B addresses were very popular and almost exhausted Class C addresses were hardly used at all
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Supernetting Assign an organization a block of plentiful addresses (class C) rather than a single scarce (class B) address Example: An organization wants to connect to the Internet The organization would prefer a class B address Plans to subnet its various physical networks using the third octet of the IP address to represent the subnet This would allow the organization to have 254 physical networks with up to 254 hosts per network
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Supernetting (cont) Example (cont): Instead of getting a class B address, the organization is given 256 contiguous class C addresses E.g. 192.17.0.0 – 192.17.255.0 Then: The organization can have up to 256 physical networks (each with its own class C network address) Each physical network can have up to 254 hosts Result: a block of plentiful addresses (class C) substituted for a single scarce (class B) address
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Extending Supernetting A few large commercial Internet Service
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  • Fall '14
  • IP address, Classless Inter-Domain Routing

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