Example Rajan Shankaran 10 An organization requires 2000 addresses to cater to

Example rajan shankaran 10 an organization requires

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Example
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Rajan Shankaran 10 An organization requires 2000 addresses to cater to a large multimedia laboratory. Suggest a suitable Supernetting scheme to cater to this requirement . Step 1: Determine the size of Supernet Block. Use eight Class C networks, or CIDR /21, to give us 2,048 possible addresses: Each Class C address provides 256 addresses. Step 2: Eight Class addresses provide 2048 addresses: Actual number of host addresses obtained is 2046 (cannot use the first and the last address ) Step 3: Select a starting address that fulfils all Supernetting rules: The starting address chosen is 192.168.16.0 Starting with 192.168.16.0, all "connected" networks must be consecutive in the numbering of the third octet. Refer to the table in the next slide. Example
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Rajan Shankaran 11 Network Available Addresses Usage Circumstances 192.168.16.0 1-255 First address not available 192.168.17.0 0-255 All addresses in range available 192.168.18.0 0-255 All addresses in range available 192.168.19.0 0-255 All addresses in range available 192.168.20.0 0-255 All addresses in range available 192.168.21.0 0-255 All addresses in range available 192.168.22.0 0-255 All addresses in range available 192.168.23.0 0-254 Last address not available Supernetting Plan for the organization Note: Address Usage
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Classless Inter-Domain Routing (CIDR ) (RFC 1518/RFC 4632) A new addressing scheme which allows for more efficient allocation of IP addresses than the old Class A, B, and C address scheme. CIDR and Supernetting standards developed independently- Not related. Used Synonymously with Route Summarization and VLSM but its different CIDR itself refers to the administrative assignment of large address blocks and the related summarized routes for the purpose of reducing the size of the routing tables. Rajan Shankaran 12
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CIDR Need for CIDR Running out of IP addresses Running out of capacity in the global routing tables How Were These Problems Solved? Restructuring IP address assignments to increase efficiency Hierarchical routing aggregation to minimize route table entries Advantages : Efficient address Allocation Allows Route Aggregation Rajan Shankaran 13
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CIDR Procedure CIDR Procedure Administrative : A hierarchy of ISPs where larger ISPs control large blocks of addresses and assign smaller blocks to smaller ISPs and customers. Technical : It involves the process of route summarization/aggregation as well as creating variable length subnetting blocks. Rajan Shankaran 14
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Restructuring IP Address Assignments Instead of being limited to network identifiers (or "prefixes") of 8, 16 or 24 bits, CIDR currently uses prefixes anywhere from 13 to 27 bits. Thus, blocks of addresses can be assigned to networks as small as 32 hosts or to those with over 500,000 hosts. CIDR address includes the standard 32-bit IP address and also information on how many bits are used for the network prefix. For example, in the CIDR address 206.13.01.48/25, the "/25" indicates the first 25 bits are used to identify the unique network leaving the remaining bits to identify the specific host.
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  • Summer '11
  • Computer Networks, IP address, Classless Inter-Domain Routing, Rajan Shankaran

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