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System Administration Guide: IP Services
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Adding a Subnet to a Network (Task Map)

If you are changing from a network that does not use a subnet to a network that does use a subnet, perform the tasks in the following task map.


Note - The information in this section applies to IPv4 subnets only. For information on planning IPv6 subnets, refer to Preparing the Network Topology for IPv6 Support and Creating a Numbering Scheme for Subnets.


Task

Description

For Instructions

1. Determine if your network topology requires subnets.

Decide on the new subnet topology, including where to locate routers and hosts on the subnets.

Planning for Routers on Your Network, What Is Subnetting?, and Network Classes

2. Assign the IP addresses with the new subnet number to the systems to become members of the subnet.

Configure IP addresses that use the new subnet number, either during Solaris OS installation or later, in the /etc/hostname.interface file.

Deciding on an IP Addressing Format for Your Network

3. Configure the network mask of the subnet on all prospective systems in the subnet.

Modify the /etc/inet/netmasks file, if you are manually configuring network clients. Or, supply the netmask to the Solaris installation program.

netmasks Database and Creating the Network Mask for IPv4 Addresses

4. Edit the network databases with the new IP addresses of all systems in the subnet.

Modify /etc/inet/hosts on all hosts to reflect the new host addresses.

hosts Database

5. Reboot all systems.

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