Scenarios

You can assign an EIP and bind it to an ECS so that the ECS can access the Internet.

Assigning an EIP

1. Log in to the management console.
2. Click in the upper left corner and select the desired region and project.
3. On the console homepage, under Network, click Elastic IP.
4. On the displayed page, click Buy EIP.
5. Set the parameters as prompted.

   Table 1 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.	CN North-Beijing1
   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. For details, see What Are the Differences Between Static BGP and Dynamic BGP?	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.	100
   IPv6 EIP	After the IPv6 EIP function is enabled, you will obtain an extra IPv6 EIP. External IPv6 addresses can access cloud resources through this IPv6 EIP.	Enable
   Bandwidth Name	The name of the bandwidth.	bandwidth
   Required Duration	The duration for which the purchased EIP will use. The duration must be specified if the Billing Mode is set to Yearly/Monthly.	1 month
   Quantity	The number of EIPs you want to purchase. The quantity must be specified if the Billing Mode is set to Pay-per-use.	1
   Tag	The EIP tags. Each tag contains a key and value pair. The tag key and value must meet the requirements listed in Table 2.	Key: Ipv4_key1 Value: 192.168.12.10
   Enterprise Project	The enterprise project to which the EIP 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

   Table 2 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 letters, digits, underscores (_), and hyphens (-).	Ipv4_key1
   Value	Can contain a maximum of 43 characters. Can contain letters, digits, underscores (_), periods (.), and hyphens (-).	192.168.12.10

   

   • If you are buying an EIP billed on a pay-per-use basis and you want to use shared bandwidth, you can only select an existing shared bandwidth from the Bandwidth Name drop-down list. If there are no shared bandwidths to select, purchase a shared bandwidth first.
   • A dedicated bandwidth cannot be changed to a shared bandwidth and vice versa. However, you can purchase shared bandwidth for pay-per-use EIPs.
     • After an EIP is added to a shared bandwidth, the EIP will use the shared bandwidth.
     • After an EIP is removed from the shared bandwidth, the EIP will use the dedicated bandwidth.
6. Click Next.
7. Click Submit.

Binding an EIP

1. On the EIPs page, locate the row that contains the target EIP, and click Bind.
2. Select the instance to which you want to bind the EIP.
3. Click OK.

Helpful Links

• How Do I Assign or Retrieve a Specific EIP?
• How Do I Access an ECS from the Internet After an EIP Is Bound to the ECS?
• Can I Bind an EIP to an ECS, to Another ECS?
• Will the EIP Bound to an ECS Be Changed After the ECS Is Stopped and Then Started?
• How Do I Check Whether the Bandwidth Exceeds the Limit?
• What Should I Do If My ECS Fails to Access the Internet Using an EIP?