Network Interface

Available in VPC

Network Interface describes the screen configuration of the Network Interface menu and network interface information, and explains how to create and manage the network interface.

Network Interface is a service for creating network interfaces that can be assigned to servers. Servers with the network interface applied are able to conduct independent network communications through subnets.

Check network interface information

You can check network interface information on the Network Interface page.

Network Interface page

From the NAVER Cloud Platform portal, click the Console > Services > Compute> Server > Network Interface menus, in that order, to view the Network Interface page.

The Network Interface page is laid out as follows:

Create network interface

The following describes how to create a network interface.

1. Click the environment you are using in the Region menu and the Platform menu on the NAVER Cloud Platform console.
2. Click Services > Compute > Server, in order.
3. Click the Network Interface menu.
4. Click the [Create network interface] button.
5. Specify the settings in the Create network interface pop-up window.
   • Network Interface name: it must start with an English letter. Enter between 3-30 characters using lowercase English letters, numbers, and hyphens (-)
   • VPC: select VPC to place the network interface
   • Subnet: select the subnet to place the network interface
   • Primary IP: select Automatic assignment or Enter directly, and enter the IP to be used by the relevant network interface
   • Secondary IP: create a subsidiary IP to be used in the same subnet
     • Enter the IP in the entry field and click the [Add] button
     • Leaving the field blank and clicking the [Add] button automatically assigns it
     • To delete the entered IP, click the [x] button
   • ACG: select ACG to place the network interface
     • You can select up to 3 ACGs, and the applicable ACG differs according to the subnet
   • Usage: usage of the network interface, automatically selected as General (exclusively for general VM) or BareMetal (exclusively for the bare metal servers) in accordance with the selected subnet
   • Select applied server: select the server to assign the network interface
6. Click the [Create] button.
   • The created network interface is displayed in the list.

Assign network interface

Among the network interfaces placed in Private Subnet, you can assign the network interfaces not assigned to a server to a server.
The following describes how to assign a network interface to a server.

1. Click the environment you are using in the Region menu and the Platform menu on the NAVER Cloud Platform console.
2. Click Services > Compute > Server, in order.
3. Click the Network Interface menu.
4. In the network interface list, click to select the network interface to assign to the server, and then click the [Assign to server] button.
5. Select the server for application in the Assign pop-up window, then click the [OK] button.
   • The network interface is assigned to the selected server.

Activate network interface

See the guide for the server OS you are using to activate the added network interface on the server.

CentOS

Access the server and run the following commands: The example activates eth1:

$> vi /etc/sysconfig/network-scripts/ifcfg-eth1
	DEVICE=eth1
	BOOTPROTO=static
	Enter IPADDR=Interface IP
	NETMASK=255.255.255.0
	ONBOOT=yes
$> ifup eth1

Ubuntu

Access the server and run the following commands: The example activates eth1:

Legacy configuration

$> vi /etc/network/interfaces

	auto eth1
	iface eth1 inet static
    Enter # eth1 IP
	address 192.168.1.8
    # Enter subnet mask
	netmask 255.255.255.0
    
$> ifup eth1
$> ip addr list eth1

Netplan configuration

​$> vi /etc/netplan/00 Installing-netcfg.yaml

    network:
      ethernets:
        # Enter eth1 IP / subnet mask
        eth1:
          addresses: [192.168.1.8/24]
      version: 2
      
$> netplan --debug apply
$> ip addr list eth1

Windows

Access the server and run the following tasks:

1. Click > > Network & Internet > Change adapter options, in that order.
2. Right-click the icon for the added network interface, then click Properties.
3. Click the [Networking] tab, click to select Internet Protocol Version 4 (TCP/IPv4), and then click the [Properties] button.
4. Click to select Use the following IP address, enter the IP address of the network interface in IP address, and then enter "255.255.255.0" for Subnet mask.
5. Click the [OK] button.

Remove assignment of network interface

The following describes how to remove an assigned network interface from a server.

1. Click the environment you are using in the Region menu and the Platform menu on the NAVER Cloud Platform console.
2. Click Services > Compute > Server, in order.
3. Click the Network Interface menu.
4. From the network interface list, click to select the network interface to remove from the server, and then click the [Remove from server] button.
5. Check the details in the assignment removal pop-up window, and then click the [Remove] button.
   • The network interface is removed from the assigned server.

Return network interface

The following describes how to terminate an unused network interface.

1. Click the environment you are using in the Region menu and the Platform menu on the NAVER Cloud Platform console.
2. Click Services > Compute > Server, in order.
3. Click the Network Interface menu.
4. In the network interface list, click to select the network interface to terminate, and then click the [Terminate] button.
5. Check the details in the terminate pop-up window and click the [Terminate] button.
   • When assigned to a server, the [Terminate] button is activated only when you agree to the removal of assignment.
   • The network interface is terminated and disappears from the list.

Set flow log

Flow log is a function to store the communication logs generated in the network interface in Object Storage. You can set to filter and save only the communication details allowed or rejected by the ACG applied to the network interface.
The following describes how to change the flow log settings.

1. Click the environment you are using in the Region menu and the Platform menu on the NAVER Cloud Platform console.
2. Click Services > Compute > Server, in order.
3. Click the Network Interface menu.
4. Click to select the network interface to change the flow log settings in the network interface list, and then click the [Set flow log] button.
5. Specify the settings in the Set Flow log pop-up window, and then click the [Set] button.

• Collection action: select among ALLOW, DENY, or ALL for the collection action

• Collection unit (minute): enter the collection cycle between 5-15 minutes (default: 15 minutes)

• Bucket name: select the bucket to save the collected logs

  • The file name will be generated in the format of ${Region number }${FLOWLOG_configured_NETWORK-INTERFACE_number}${FLOWLOG collection interval_reference time}.
    <example>1_000123000_2023-01-01T04:21:00Z_0.log

• Bucket folder name: enter the name of the bucket folder to save the collected logs

• The log description is as follows:
  (For ncloud resources that have both Public IP and Private IP, the Private IP will be displayed.)

  Field name	Description
  LOG_TIME	Log occurrence time (epoch)
  DIRECTION	Packet direction (inbound/outbound)
  REGION	NCP Region number
  VPC_NM	VPC name
  VPC_NO	VPC unique ID
  SBNET_NO	Subnet unique ID
  INSTC_NO	VM unique ID
  NIC_ID	Network interface unique ID
  SRC_ADDR	Source address of traffic
  SRC_PORT	Source port of traffic
  DST_ADDR	Destination address of traffic
  DST_PORT	Destination port of traffic
  ACTION	ACG setting rules (ALL, ALLOW, DENY)
  PROTOCOL	Communication protocol (TCP, UDP, ICMP)
  TP_CD	Type of network interface

Set secondary IP

Secondary IP is a feature that adds secondary IPs to network interfaces assigned to servers to be utilized for HA solutions and so on.

• You can use them if you need to use several IPs in a single subnet.
  <example> If you have created redundancy with an Active server and Standby server in a cluster, you can move a secondary IP for services between the two servers.
• Up to 5 secondary IPs can be manually specified or randomly assigned within the IP range of the subnet that the network interface belongs to.

The following describes how to change the secondary IP settings.

1. Click the environment you are using in the Region menu and the Platform menu on the NAVER Cloud Platform console.
2. Click Services > Compute > Server, in order.
3. Click the Network Interface menu.
4. Click to select the network interface to change the Secondary IP settings for in the network interface list, and then click the [Set Secondary IP] button.
5. Change the settings from the Set Secondary IP pop-up window, and then click the [Set] button.
   • Enter the IP in the input field, and click the [Add] button.
   • Leaving the field blank and clicking the [Add] button automatically assigns the IP.
   • To delete the entered IP, click the [x] button.

Activate Secondary IP

For Secondary IPs to function properly, they need to be created and changed from the console, and then set up from the server. The following describes how to change the Secondary IP settings for each server OS.

CentOS

Access the server and run the following commands: The following example configures a secondary IP on eth1:

$> vi /etc/sysconfig/network-scripts/ifcfg-eth1:0
    DEVICE=eth1:0
    BOOTPROTO=static
    # Enter secondary IP
    IPADDR=192.168.1.9
    # Enter subnet mask
    NETMASK=255.255.255.0
    ONBOOT=yes
$> ifup eth1:0
$> ip addr list eth1

Ubuntu

Access the server and run the following commands: The following example configures a secondary IP on eth1:

Legacy configuration

$> vi /etc/network/interfaces

    auto eth1
    iface eth1 inet static
    # Enter eth1 IP
    address 192.168.1.8
    # Enter subnet mask
    netmask 255.255.255.0 
    
    iface eth1 inet static
    # Enter secondary IP
    address 192.168.1.9
    # Enter subnet mask
    netmask 255.255.255.0
    
$> systemctl restart networking.service
$> ip addr list eth1

Netplan configuration

$> vi /etc/netplan/00-installer-config.yaml

    network:
      ethernets:
        # Enter primary eth1 IP, secondary IP / subnet mask
        eth1:
          addresses: [192.168.1.8/24, 192.168.1.9/24]    
      version: 2

$> netplan --debug apply
$> ip addr list eth1

Windows

Access the server and run the following tasks:

1. Click > > Network & Internet > Change adapter options, in that order.
2. Right-click the icon for the added network interface, and then click Properties.
3. Click the [Networking] tab, click to select Internet Protocol Version 4 (TCP/IPv4), and then click the [Properties] button.
4. Click the [Advanced] button.
5. Click the [Add] button from the IP address area.
6. Enter the added Secondary IP address, then click the [OK] button.