Modifying the DHCP Options Set Associated with a Net

You can associate a default or custom DHCP options set with a Net to apply the options it contains to virtual machines (VMs) created in this Net.

This action replaces the DHCP options set with another one, as you can associate a Net with one DHCP options set only at a time.

When you modify the DHCP options set associated with a Net, the options it contains are automatically applied to both existing VMs and VMs that you launch afterward. Existing VMs apply these options within a few hours after you modify the DHCP options set, depending on their DHCP lease renewal frequency. You do not need to restart the VMs. You can however force the renewal of your DHCP lease using the dhclient command for Linux VMs, or the ipconfig/renew command for Windows VMs.

Modifying the DHCP Options Set Associated with a Net Using Cockpit v2

  1. Click inside the Nets dashboard to make checkboxes appear.

  2. Check the box of the Net you want to associate with the DHCP options set.
    The Net is selected and an action menu appears.

  3. Click IconEdit Update.
    The UPDATE DHCP OPTIONS SET dialog box appears.

  4. In the list, select the DHCP options set you want to associate with your Net.

  5. Click Update.
    The DHCP options set is associated with the Net and replaces the previous set.

Modifying the DHCP Options Set Associated with a Net Using OSC CLI

The UpdateNet command associates a DHCP options set with a specified Net.

Request sample
$ osc-cli api UpdateNet --profile "default" \
    --NetId "vpc-12345678" \
    --DhcpOptionsSetId "dopt-12345678"

This command contains the following attributes that you need to specify:

  • DhcpOptionsSetId: The ID of the DHCP options set (or default if you want to associate the default one).

  • DryRun: (optional) If true, checks whether you have the required permissions to perform the action.

  • NetId: The ID of the Net.

The UpdateNet command returns the following elements:

  • Net: Information about the Net.

  • ResponseContext: Information about the context of the response.

Result sample
{
  "ResponseContext": {
    "RequestId": "0475ca1e-d0c5-441d-712a-da55a4175157"
  },
  "Net": {
    "Tags": [],
    "DhcpOptionsSetId": "dopt-12345678",
    "IpRange": "10.0.0.0/16",
    "Tenancy": "default",
    "NetId": "vpc-12345678",
    "State": "available"
  }
}

Modifying the DHCP Options Set Associated with a VPC Using AWS CLI

To modify the DHCP options set associated with a VPC, use the associate-dhcp-options command following this syntax:

Request sample
$ aws ec2 associate-dhcp-options \
    --profile YOUR_PROFILE \
    --dhcp-options-id dopt-1234abcd \
    --vpc-id vpc-12345678 \
    --endpoint https://fcu.eu-west-2.outscale.com

This command contains the following attributes that you need to specify:

  • (optional) profile: The named profile you want to use, created when configuring AWS CLI. For more information, see Installing and Configuring AWS CLI.

  • dhcp-options-id: The ID of the DHCP options set you want to associate with the VPC, or default if you want to associate the default one.

    A VPC cannot have no DHCP options set associated with it.

  • vpc-id: The ID of the VPC you want to associate the DHCP options set with.

  • endpoint: The endpoint corresponding to the Region you want to send the request to.

The DHCP options set is associated with the specified VPC.

Related Pages

Corresponding API Methods

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