- What's New
- Function Overview
- Service Overview
- Getting Started
-
User Guide
- Permissions Management
- VPC and Subnet
- Route Table and Route
- Virtual IP Address
-
Elastic Network Interface and Supplementary Network Interface
-
Elastic Network Interface
- Elastic Network Interface Overview
- Creating a Network Interface
- Viewing the Basic Information About a Network Interface
- Attaching a Network Interface to a Cloud Server
- Binding an EIP to a Network Interface
- Binding a Network Interface to a Virtual IP Address
- Detaching a Network Interface from an Instance or Unbinding an EIP from a Network Interface
- Changing Security Groups That Are Associated with a Network Interface
- Deleting a Network Interface
-
Supplementary Network Interfaces
- Supplementary Network Interface Overview
- Creating a Supplementary Network Interface
- Viewing the Basic Information About a Supplementary Network Interface
- Binding or Unbinding an EIP to or from a Supplementary Network Interface
- Changing Security Groups That Are Associated with a Supplementary Network Interface
- Deleting a Supplementary Network Interface
- Network Interface Configuration Examples
-
Elastic Network Interface
-
Access Control
- Access Control Overview
- Security Group
- Network ACL
- IP Address Group
-
VPC Peering Connection
- VPC Peering Connection Overview
- VPC Peering Connection Usage
- Creating a VPC Peering Connection to Connect Two VPCs in the Same Account
- Creating a VPC Peering Connection to Connect Two VPCs in Different Accounts
- Obtaining the Peer Project ID of a VPC Peering Connection
- Modifying a VPC Peering Connection
- Viewing VPC Peering Connections
- Deleting a VPC Peering Connection
- Modifying Routes Configured for a VPC Peering Connection
- Viewing Routes Configured for a VPC Peering Connection
- Deleting Routes Configured for a VPC Peering Connection
- IPv4/IPv6 Dual-Stack Network
- VPC Flow Log
- Elastic IP
- Shared Bandwidth
- Monitoring and Auditing
- Managing Quotas
- Best Practices
-
API Reference
- Before You Start
- API Overview
- Calling APIs
- APIs
-
API V3
- VPC
- Security Group
- Security Group Rule
- IP Address Group
-
Supplementary Network Interface
- Creating a Supplementary Network Interface
- Creating Supplementary Network Interfaces in Batches
- Querying Supplementary Network Interfaces
- Querying the Details of a Supplementary Network Interface
- Querying the Number of Supplementary Network Interfaces
- Updating a Supplementary Network Interface
- Deleting a Supplementary Network Interface
- Network ACL
- Port
-
Native OpenStack Neutron APIs (V2.0)
- API Version Information
- Port
- Network
- Subnet
- Router
-
Network ACL
- Querying Network ACL Rules
- Querying a Network ACL Rule
- Creating a Network ACL Rule
- Updating a Network ACL Rule
- Deleting a Network ACL Rule
- Querying Network ACL Policies
- Querying a Network ACL Policy
- Creating a Network ACL Policy
- Updating a Network ACL Policy
- Deleting a Network ACL Policy
- Inserting a Network ACL Rule
- Removing a Network ACL Rule
- Querying Network ACL Groups
- Querying a Network ACL Group
- Creating a Network ACL Group
- Updating a Network ACL Group
- Deleting a Network ACL Group
- Security Group
- Application Examples
-
Permissions and Supported Actions
- Introduction
- VPC
- Subnet
- Port
- VPC Peering Connection
- VPC Route
- Route Table
- Quota
- Private IP Address
- Security Group
- Security Group Rule
- VPC Tag
- Subnet Tag
- Port (OpenStack Neutron API)
- Network (OpenStack Neutron API)
- Subnet (OpenStack Neutron API)
- Router (OpenStack Neutron API)
- Network ACL (OpenStack Neutron API)
- Security Group (OpenStack Neutron API)
- Precautions for API Permissions
- FAQs
- Out-of-Date APIs
- Appendix
- SDK Reference
-
FAQs
-
Billing and Payments
- Will I Be Billed for Using the VPC Service?
- Why Is My VPC Still Being Billed After It Was Deleted?
- How Do I View My VPC Bills?
- How Is an EIP Charged?
- How Do I Change My EIP Billing Mode Between Pay-per-Use and Yearly/Monthly?
- How Do I Change the Billing Option of a Pay-per-Use EIP Between By Bandwidth and By Traffic?
-
VPCs and Subnets
- What Is Virtual Private Cloud?
- Which CIDR Blocks Are Available for the VPC Service?
- How Many VPCs Can I Create?
- Can Subnets Communicate with Each Other?
- What Subnet CIDR Blocks Are Available?
- Can I Change the CIDR Block of a Subnet?
- How Many Subnets Can I Create?
- How Do I Make the Changed DHCP Lease Time of a Subnet Take Effect Immediately?
- Why Can't I Delete My VPCs and Subnets?
- Can I Change the VPC of an ECS?
- Why Is the ECS IP Address Released After the System Time Is Changed?
- How Do I Change the DNS Server Address of an ECS?
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EIPs
- How Do I Assign or Retrieve a Specific EIP?
- What Are the Differences Between EIP, Private IP Address, and Virtual IP Address?
- Can I Change the Dedicated Bandwidth Used by an EIP to a Shared Bandwidth?
- How Many ECSs Can I Bind an EIP To?
- How Do I Access an ECS with an EIP Bound from the Internet?
- What Is the EIP Assignment Policy?
- Can I Bind an EIP of an ECS to Another ECS?
- Can I Buy a Specific EIP?
- How Do I Query the Region of My EIPs?
- How Can I Unbind an Existing EIP from an Instance and Bind Another EIP to the Instance?
- Can I Bind an EIP to a Cloud Resource in Another Region?
- Can I Change the Region of an EIP?
- VPC Peering Connections
- Virtual IP Addresses
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Bandwidth
- What Are Inbound Bandwidth and Outbound Bandwidth?
- What Are the Differences Between Static BGP and Dynamic BGP?
- How Do I Know If My EIP Bandwidth Limit Has Been Exceeded?
- What Are the Differences Between Public Bandwidth and Private Bandwidth?
- What Bandwidth Types Are Available?
- What Are the Differences Between a Dedicated Bandwidth and a Shared Bandwidth?
- How Many EIPs Can I Add to Each Shared Bandwidth?
- Can I Increase a Yearly/Monthly Bandwidth and Decrease It Later?
- What Is the Relationship Between Bandwidth and Upload/Download Rate?
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Connectivity
- Does a VPN Allow Communication Between Two VPCs?
- Why Cannot I Access Public Websites Through Domain Names or Access Internal Domain Names on the Cloud When My ECS Has Multiple NICs?
- What Are the Priorities of the Custom Route and EIP If Both Are Configured for an ECS to Enable the ECS to Access the Internet?
- Why Are There Intermittent Interruptions When a Local Host Accesses a Website Built on an ECS?
- Why Do ECSs Using Private IP Addresses in the Same Subnet Only Support One-Way Communication?
- Why Does Communication Fail Between Two ECSs in the Same VPC or Packet Loss Occur When They Communicate?
- Why Can't My ECS Use Cloud-init?
- Why Can't My ECS Access the Internet Even After an EIP Is Bound?
- Why Is My ECS Unable to Communicate at a Layer 2 or Layer 3 Network?
- How Do I Handle a BMS Network Failure?
- Why Does My ECS Fail to Obtain an IP Address?
- How Do I Handle a VPN or Direct Connect Connection Network Failure?
- Why Can My Server Be Accessed from the Internet But Cannot Access the Internet?
- Why Can't I Access Websites Using IPv6 Addresses After IPv4/IPv6 Dual Stack Is Configured?
- Why Does My ECS Fail to Communicate with Other After It Has Firewall Installed?
- Routing
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Security
- Does a Modified Security Group Rule or a Network ACL Rule Take Effect Immediately for Existing Connections?
- Why Is Outbound Access on TCP Port 25 Blocked?
- How Do I Know the Instances Associated with a Security Group?
- Why Can't I Delete a Security Group?
- Can I Change the Security Group of an ECS?
- How Do I Configure a Security Group for Multi-Channel Protocols?
- Why Are Some Ports of ECSs Inaccessible?
- Why Is Access from a Specific IP Address Still Allowed After a Network ACL Rule That Denies the Access from the IP Address Has Been Added?
- Why Are My Security Group Rules Not Working?
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Billing and Payments
How Do I Know If My EIP Bandwidth Limit Has Been Exceeded?
Symptom
The bandwidth size configured when you buy a dedicated or shared bandwidth defines the maximum amount of outbound bandwidth supported. If an ECS running your web applications cannot be accessed smoothly from the Internet, check whether the bandwidth of the EIP bound to the ECS is greater than the configured bandwidth size.
If the bandwidth exceeds the configured bandwidth size, there may be packet loss or remote login to an ECS may fail. To prevent data loss, it is recommended that you monitor the bandwidth.
Troubleshooting
Troubleshoot the issue by following the procedure described below. If the problem persists, submit a service ticket.
![](https://support.huaweicloud.com/eu/vpc_faq/en-us_image_0000001939929881.png)
- Check whether the EIP bandwidth usage has exceeded the configured size.
- Check the monitoring data on the EIP bandwidth usage.
Check whether the inbound bandwidth and outbound bandwidth usage have exceeded the amount purchased.
- Check EIP bandwidth overflow event.
For details about how to check the event, see 1.
If you have not configured EIP bandwidth overflow events, configure one by referring to solution 2. If there is packet loss or access delay, you can view EIP bandwidth overflow event on the Event Monitoring page.
If the bandwidth usage goes too high for a little while but it does not interrupt your services, ignore the problem. If the bandwidth usage goes too high many times or if the issue lasts for a long time, fix the problem as described in 2.
- Check the monitoring data on the EIP bandwidth usage.
- Fix the excessive bandwidth usage issue.
Traffic surges may cause the bandwidth to go beyond of the configured limit, causing packet loss.
Check whether the sudden increase in bandwidth is normal.
1. If it is normal, increase the bandwidth.
2. If it is not normal, for example, the sudden increase in bandwidth was caused by online attacks, rectify the fault by referring to System Processes Leading to High Bandwidth Usage.
- Check the alarm rule settings and EIP connectivity if the bandwidth usage has not exceeded the configured limit.
After doing the checks in Step 1, if the bandwidth usage has not exceeded the configured limit or the purchased bandwidth:
- Check whether Cloud Eye alarm rules are configured properly.
If there are alarm rules for bandwidth usage on the Cloud Eye console, where the outbound bandwidth limit or the alarm period is set too small, the system may generate excessive alarms. You can refer to Improper Cloud Eye Alarm Rules to fix the problem.
- Check whether the EIP connection has failed.
If an ECS with an EIP bound cannot access the Internet, you can refer to Why Can't My ECS Access the Internet Even After an EIP Is Bound?
- Check whether Cloud Eye alarm rules are configured properly.
System Processes Leading to High Bandwidth Usage
If some heavy-duty system processes or applications running on your ECS are causing the high bandwidth or CPU usage, your ECS will run slowly or may unexpectedly be inaccessible.
You can locate processes that have led to excessively high bandwidth or CPU usage, and optimize or stop the processes.
Improper Cloud Eye Alarm Rules
If there are alarm rules for bandwidth usage on the Cloud Eye console, where the outbound bandwidth limit or the alarm period is set too small, the system may generate excessive alarms.
- Log in to the management console, under Management & Governance, click Cloud Eye. On the Cloud Eye console, choose Alarm Management > Alarm Rules.
- Click Create Alarm Rule and configure an alarm rule to generate alarms when the bandwidth usage exceeds the configured limit.
- Solution 2: Configure EIP bandwidth overflow events.
NOTE:
The Event Monitoring page only displays EIP status. It does not display the shared bandwidth limit.
To configure EIP bandwidth overflow events:- Log in to the management console, under Management & Governance, click Cloud Eye. On the Cloud Eye console, choose Event Monitoring.
- Click Create Alarm Rule and configure an alarm rule to generate alarms when the EIP bandwidth usage exceeds the limit.
After the configuration, you can view the usage details of the EIP dedicated bandwidth on the Event Monitoring page when there are packet loss or data transfer delays.
To check the EIP bandwidth overflow history, perform the following steps:- On the Cloud Eye console, click Event Monitoring.
- On the Event Monitoring page, locate the target monitoring event and click View Graph in the Operation column.
- On the system event list page, locate the target monitored object and click View Event in the Operation column to view the bandwidth overflow details.
If the event EIP bandwidth overflow is not displayed, the usage of the dedicated EIP bandwidth did not exceed the preset limit.
If the event EIP bandwidth overflow is displayed, the usage of the dedicated EIP bandwidth exceeded the limit. To ensure stability and high availability of your workload, you can increase your bandwidth.
You will not be billed for Cloud Eye alarms, but if you enable SMN to send out alarm notifications, this will incur charges. For details, see the Cloud Eye User Guide.
Submitting a Service Ticket
If the problem persists, submit a service ticket.
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