Setting Up an IPv4 Network

Step 1: Create a VPC

Before creating your VPCs, determine how many VPCs, the number of subnets, and what IP address ranges you will need. For details, see Network Planning.

In the instructions presented here, our sample VPC is named vpc-test and its default subnet called subnet-01.

1. Go to the Create VPC page.
2. On the Create VPC page, set parameters as prompted.

   A default subnet will be created together with a VPC and you can also click Add Subnet to create more subnets for the VPC.

   Figure 2 Creating a VPC and subnet
   

   Table 1 VPC parameter descriptions

   Parameter	Description	Example Value
   Region	Select the region nearest to you to ensure the lowest latency possible.	EU-Dublin
   Name	The VPC name. The name can contain a maximum of 64 characters, which may consist of letters, digits, underscores (_), hyphens (-), and periods (.). The name cannot contain spaces.	VPC-test
   IPv4 CIDR Block	The CIDR block of the VPC. The CIDR block of a subnet can be the same as the CIDR block for the VPC (for a single subnet in the VPC) or a subset of the CIDR block for the VPC (for multiple subnets in the VPC). The following CIDR blocks are supported: 10.0.0.0/8-24 172.16.0.0/12-24 192.168.0.0/16-24 This parameter will be CIDR Block in regions where IPv4/IPv6 dual stack is not supported, and IPv4 CIDR Block if IPv4/IPv6 dual stack is supported.	192.168.0.0/16
   Enterprise Project	The enterprise project to which the VPC belongs. An enterprise project facilitates project-level management and grouping of cloud resources and users. The name of the default project is default. For details about creating and managing enterprise projects, see the Enterprise Management User Guide.	default
   Advanced Settings	Click the drop-down arrow to set advanced VPC parameters, including tags.	Retain the default settings.
   Tag	The VPC tag, which consists of a key and value pair. You can add a maximum of 10 tags to each VPC.	Key: vpc_key1 Value: vpc-01
   Description	Supplementary information about the VPC. This parameter is optional. The VPC description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).	N/A

   Table 2 Subnet parameter descriptions

   Parameter	Description	Example Value
   AZ	An AZ is a geographic location with independent power supply and network facilities in a region. AZs are physically isolated, and AZs in the same VPC are interconnected through an internal network. For details, see Region and AZ. Note the following when you select an AZ: A VPC can have subnets that are in different AZs. For example, a VPC can have subnet A in AZ 1, and subnet B in AZ 3. A cloud resource and its subnet can be in different AZs. For example, a cloud server in AZ 1 can use a subnet in AZ 3.	AZ1
   Name	The subnet name. The name can contain a maximum of 64 characters, which may consist of letters, digits, underscores (_), hyphens (-), and periods (.). The name cannot contain spaces.	subnet-01
   IPv4 CIDR Block	The CIDR block for the subnet. This value must be within the VPC CIDR block. This parameter is displayed only in regions where IPv4/IPv6 dual stack is supported.	192.168.0.0/24
   IPv6 CIDR Block	Specifies whether to set IPv6 CIDR Block to Enable. After the IPv6 function is enabled, the system automatically assigns an IPv6 CIDR block to the created subnet. Currently, the IPv6 CIDR block cannot be customized. IPv6 cannot be disabled after the subnet is created. This parameter is displayed only in regions where IPv4/IPv6 dual stack is supported.	-
   Associated Route Table	The default route table to which the subnet will be associated. You can change the route table to a custom route table on the Subnets page.	Default
   Advanced Settings	Click the drop-down arrow to set advanced settings for the subnet, including Gateway and DNS Server Address.	Retain the default settings.
   Gateway	The gateway address of the subnet. This IP address is used to communicate with other subnets.	192.168.0.1
   DNS Server Address	Huawei Cloud private DNS server addresses are entered by default. This allows ECSs in a VPC to communicate with each other and also access other cloud services using private domain names without exposing their IP addresses to the Internet. You can change the default DNS server addresses if needed. This may interrupt your access to cloud services. You can also click Reset on the right to restore the DNS server addresses to the default value. A maximum of two DNS server IP addresses can be configured. Multiple IP addresses must be separated using commas (,).	100.125.x.x
   DHCP Lease Time	The period during which a client can use an IP address automatically assigned by the DHCP server. After the lease time expires, a new IP address will be assigned to the client. Limited: Set the DHCP lease time. The unit can be day or hour. Unlimited: The DHCP lease time does not expire. After you change the DHCP lease time on the console, the change is applied automatically when the DHCP lease of an instance (such as ECS) is renewed. You can wait for the system to renew the lease or manually renew the lease. Renewing lease will not change the IP address used by the instance. If you want the new lease time to take effect immediately, manually renew the lease or restart the ECS.	-
   Tag	The subnet tag, which consists of a key and value pair. You can add a maximum of 10 tags to each subnet.	Key: subnet_key1 Value: subnet-01
   Description	Supplementary information about the subnet. This parameter is optional. The subnet description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).	N/A

   Table 3 VPC tag key and value requirements

   Parameter	Requirements	Example Value
   Key	Cannot be left blank. Must be unique for each VPC and can be the same for different VPCs. Can contain a maximum of 36 characters. Can contain only the following character types: Uppercase letters Lowercase letters Digits Special characters, including hyphens (-) and underscores (_)	vpc_key1
   Value	Can contain a maximum of 43 characters. Can contain only the following character types: Uppercase letters Lowercase letters Digits Special characters, including periods (.), hyphens (-) and underscores (_)	vpc-01

   Table 4 Subnet tag key and value requirements

   Parameter	Requirements	Example Value
   Key	Cannot be left blank. Must be unique for each subnet. Can contain a maximum of 36 characters. Can contain only the following character types: Uppercase letters Lowercase letters Digits Special characters, including hyphens (-) and underscores (_)	subnet_key1
   Value	Can contain a maximum of 43 characters. Can contain only the following character types: Uppercase letters Lowercase letters Digits Special characters, including hyphens (-) and underscores (_)	subnet-01

3. Confirm the current configuration and click Create Now.

Step 2: Buy an ECS

On the management console, under Compute, click Elastic Cloud Server, and then click Buy ECS.

Configure the network as follows:

Figure 3 Network configuration

Figure 4 Network configuration

• Network: Select the created VPC vpc-test and subnet subnet-01.
• Security Group: Select the default security group Sys-default. Table 5 lists the default security group rules.
  You can also create a security group and add rules to it.

  Table 5 Rules in the default security group

  Direction	Action	Type	Protocol & Port	Source/Destination	Description
  Inbound	Allow	IPv4	All	Source: default security group (default)	This rule allows IPv4 instances in the security group to communicate with each other using any protocol over any port.
  Inbound	Allow	IPv6	All	Source: Default security group (default)	This rule allows IPv6 instances in the security group to communicate with each other using any protocol over any port.
  Outbound	Allow	IPv4	All	Destination: 0.0.0.0/0	This rule allows all traffic from the instances in the security group to any IPv4 address over any port.
  Outbound	Allow	IPv6	All	Destination: ::/0	This rule allows all traffic from the instances in the security group to any IPv6 address over any port.

• EIP: Select Not required.

Step 3: Buy an EIP and Bind It to an ECS

The EIP service provides independent public IP addresses and bandwidth for Internet access. You can buy an EIP and bind it to an ECS to allow the ECS to access the Internet.

If you already have an EIP that has not been bound to any resource, you can directly bind the EIP to the ECS.

Buying an EIP

1. Log in to the management console.
2. Click in the upper left corner and choose Networking > Virtual Private Cloud.

   The Virtual Private Cloud page is displayed.

3. Choose Elastic IP and Bandwidth > EIPs.
4. Click Buy EIP.
5. Set parameters as prompted.
   Figure 5 Buying an EIP
   

   Table 6 Parameter descriptions

   Parameter	Description	Example Value
   Billing Mode	The following billing modes are available: Yearly/Monthly Pay-per-use	Pay-per-use
   Region	Regions are geographic areas that are physically isolated from each other. The networks inside different regions are not connected to each other, so resources cannot be shared across different regions. For lower network latency and faster access to your resources, select the region nearest you.	-
   EIP Type	Dynamic BGP: Dynamic BGP provides automatic failover and chooses the optimal path when a network connection fails. Static BGP: Static BGP offers more routing control and protects against route flapping, but an optimal path cannot be selected in real time when a network connection fails.	Dynamic BGP
   Billed By	This parameter is available when you set Billing Mode to Pay-per-use. Bandwidth: You specify a maximum bandwidth and pay for the amount of time you use the bandwidth. This is suitable for scenarios with heavy or stable traffic. Traffic: You specify a maximum bandwidth and pay for the total traffic you use. This is suitable for scenarios with light or sharply fluctuating traffic. Shared Bandwidth: The bandwidth can be shared by multiple EIPs. This is suitable for scenarios with staggered traffic.	Bandwidth
   Bandwidth	The bandwidth size in Mbit/s.	5
   Bandwidth Name	The name of the bandwidth.	bandwidth-test
   Required Duration	This parameter is available only when Billing Mode is set to Yearly/Monthly.	1 month
   Quantity	The number of EIPs you want to assign. The quantity must be specified if the Billing Mode is set to Pay-per-use.	1
   Tag	The EIP tag that consists of a key and value pair. The tag key and value must meet the requirements listed in Table 7.	Key: Ipv4_key1 Value: 192.168.12.10
   Enterprise Project	The enterprise project that the EIP belongs to. An enterprise project facilitates project-level management and grouping of cloud resources and users. The name of the default project is default. For details about creating and managing enterprise projects, see the Enterprise Management User Guide.	default

   Table 7 EIP tag requirements

   Parameter	Requirement	Example Value
   Key	Cannot be left blank. Must be unique for each EIP. Can contain a maximum of 36 characters. Can contain only the following character types: Uppercase letters Lowercase letters Digits Special characters, including hyphens (-) and underscores (_)	Ipv4_key1
   Value	Can contain a maximum of 43 characters. Can contain only the following character types: Uppercase letters Lowercase letters Digits Special characters, including hyphens (-) and underscores (_)	3005eip

6. Click Next.

Binding the EIP

1. In the EIP list, locate the target EIP and click Bind.
   Figure 6 Bind
   
2. Select the ECS.
   Figure 7 Bind EIP
   

3. Click OK.

Verifying the Result

Ensure that the security group of the ECS allows the ICMP traffic (ping) and the access from specific ports, such as port 22 (SSH) and port 3389 (RDP).