modify-subnet-attribute¶

Description¶

Modifies a subnet attribute. You can only modify one attribute at a time.

Use this action to modify subnets on Amazon Web Services Outposts.

To modify a subnet on an Outpost rack, set both MapCustomerOwnedIpOnLaunch and CustomerOwnedIpv4Pool . These two parameters act as a single attribute.
To modify a subnet on an Outpost server, set either EnableLniAtDeviceIndex or DisableLniAtDeviceIndex .

For more information about Amazon Web Services Outposts, see the following:

Synopsis¶

  modify-subnet-attribute
[--assign-ipv6-address-on-creation | --no-assign-ipv6-address-on-creation]
[--map-public-ip-on-launch | --no-map-public-ip-on-launch]
--subnet-id <value>
[--map-customer-owned-ip-on-launch | --no-map-customer-owned-ip-on-launch]
[--customer-owned-ipv4-pool <value>]
[--enable-dns64 | --no-enable-dns64]
[--private-dns-hostname-type-on-launch <value>]
[--enable-resource-name-dns-a-record-on-launch | --no-enable-resource-name-dns-a-record-on-launch]
[--enable-resource-name-dns-aaaa-record-on-launch | --no-enable-resource-name-dns-aaaa-record-on-launch]
[--enable-lni-at-device-index <value>]
[--disable-lni-at-device-index | --no-disable-lni-at-device-index]
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]

Options¶

--assign-ipv6-address-on-creation | --no-assign-ipv6-address-on-creation (structure)

Specify true to indicate that network interfaces created in the specified subnet should be assigned an IPv6 address. This includes a network interface that’s created when launching an instance into the subnet (the instance therefore receives an IPv6 address).

If you enable the IPv6 addressing feature for your subnet, your network interface or instance only receives an IPv6 address if it’s created using version 2016-11-15 or later of the Amazon EC2 API.

Value -> (boolean)

The attribute value. The valid values are true or false .

--map-public-ip-on-launch | --no-map-public-ip-on-launch (structure)

Specify true to indicate that network interfaces attached to instances created in the specified subnet should be assigned a public IPv4 address.

Value -> (boolean)

The attribute value. The valid values are true or false .

--subnet-id (string)

The ID of the subnet.

--map-customer-owned-ip-on-launch | --no-map-customer-owned-ip-on-launch (structure)

Specify true to indicate that network interfaces attached to instances created in the specified subnet should be assigned a customer-owned IPv4 address.

When this value is true , you must specify the customer-owned IP pool using CustomerOwnedIpv4Pool .

Value -> (boolean)

The attribute value. The valid values are true or false .

--customer-owned-ipv4-pool (string)

The customer-owned IPv4 address pool associated with the subnet.

You must set this value when you specify true for MapCustomerOwnedIpOnLaunch .

--enable-dns64 | --no-enable-dns64 (structure)

Indicates whether DNS queries made to the Amazon-provided DNS Resolver in this subnet should return synthetic IPv6 addresses for IPv4-only destinations.

Value -> (boolean)

The attribute value. The valid values are true or false .

--private-dns-hostname-type-on-launch (string)

The type of hostnames to assign to instances in the subnet at launch. For IPv4 only subnets, an instance DNS name must be based on the instance IPv4 address. For IPv6 only subnets, an instance DNS name must be based on the instance ID. For dual-stack subnets, you can specify whether DNS names use the instance IPv4 address or the instance ID.

Possible values:

ip-name

resource-name

--enable-resource-name-dns-a-record-on-launch | --no-enable-resource-name-dns-a-record-on-launch (structure)

Indicates whether to respond to DNS queries for instance hostnames with DNS A records.

Value -> (boolean)

The attribute value. The valid values are true or false .

--enable-resource-name-dns-aaaa-record-on-launch | --no-enable-resource-name-dns-aaaa-record-on-launch (structure)

Indicates whether to respond to DNS queries for instance hostnames with DNS AAAA records.

Value -> (boolean)

The attribute value. The valid values are true or false .

--enable-lni-at-device-index (integer)

Indicates the device position for local network interfaces in this subnet. For example, 1 indicates local network interfaces in this subnet are the secondary network interface (eth1). A local network interface cannot be the primary network interface (eth0).

--disable-lni-at-device-index | --no-disable-lni-at-device-index (structure)

Specify true to indicate that local network interfaces at the current position should be disabled.

Value -> (boolean)

The attribute value. The valid values are true or false .

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See ‘aws help’ for descriptions of global parameters.

Examples¶

To change a subnet’s public IPv4 addressing behavior

This example modifies subnet-1a2b3c4d to specify that all instances launched into this subnet are assigned a public IPv4 address. If the command succeeds, no output is returned.

Command:

aws ec2 modify-subnet-attribute --subnet-id subnet-1a2b3c4d --map-public-ip-on-launch

To change a subnet’s IPv6 addressing behavior

This example modifies subnet-1a2b3c4d to specify that all instances launched into this subnet are assigned an IPv6 address from the range of the subnet.

Command:

aws ec2 modify-subnet-attribute --subnet-id subnet-1a2b3c4d --assign-ipv6-address-on-creation

For more information, see IP Addressing in Your VPC in the AWS Virtual Private Cloud User Guide.

Output¶

None

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