May 1, 2011

How to create Subnets

To create subnetworks you take bits from the host portion of the ip address & reserve them to define the subnet address.
This means fewer bits for hosts, so the more subnets the fewer bits available for defining hosts.

1. Determine the number of required network IDs:
  • One for each subnet.
  • One for each wide area network connection.
2. Determine the number of required host IDs per subnet:
  • One for each TCP/IP.
  • One for each router interface.
3. Based on the above requirements, create the following:
  • One subnet mask for your entire network.
  • A unique subnet ID for each physical segment.
  • A range of  host IDs for each subnet.

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