- What's New
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User Guide
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FAQs
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Product Consultation
- Managing Quotas
- How Do I Assign or Retrieve a Specific EIP?
- Why Is an EIP Newly Assigned the Same as the One I Released?
- Can I Buy a Specific EIP?
- Does an EIP Change Over Time?
- Why Can't I Find My Purchased EIP on the Management Console?
- What Is the EIP Assignment Policy?
- Can an EIP Be Used or Migrated Across Accounts?
- How Do I Query the Traffic Usage of My EIP?
- Do I Need to Configure a Shared Data Package for Use After It Is Purchased?
- Can I Change the Dedicated Bandwidth Used by an EIP to a Shared Bandwidth?
- How Many ECSs Can I Bind an EIP To?
- What Are the Differences Between EIP, Private IP Address, and Virtual IP Address?
- What Are the Differences Among a Bandwidth Add-On Package, Shared Data Package, and Shared Bandwidth?
- When Should I Use Premium BGP and Are There Any Limitations on Using Premium BGP?
- Why My EIPs Are Frozen? How Do I Unfreeze My EIPs?
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Billing and Payments
- How Is an EIP Billed?
- 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?
- Why Am I Still Being Billed After My EIP Has Been Unbound or Released?
- When Will I Be Billed for Reservation Price?
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EIP Binding and Unbinding
- How Do I Access an ECS with an EIP Bound from the Internet?
- How Can I Unbind an Existing EIP from an Instance and Bind Another EIP to the Instance?
- Can I Bind an EIP of an ECS to Another ECS?
- Can I Bind an EIP to a Cloud Resource in Another Region?
- Can Multiple EIPs Be Bound to an ECS?
- What Are the Differences Between Unbinding and Releasing an EIP?
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Bandwidth
- How Do I Increase a Bandwidth to Be More Than 300 Mbit/s?
- What Bandwidth Types Are Available?
- How Many EIPs Can I Add to Each Shared Bandwidth?
- What Are the Differences Between a Dedicated Bandwidth and a Shared Bandwidth?
- What Are Inbound Bandwidth and Outbound Bandwidth?
- How Do I Know If My EIP Bandwidth Has Been Exceeded?
- What Are the Differences Between Public Bandwidth and Private Bandwidth?
- Can I Increase a Yearly/Monthly Bandwidth and Decrease It Later?
- What Is the Relationship Between Bandwidth and Upload/Download Rate?
- What Are the Differences Among Static BGP, Dynamic BGP, and Premium BGP?
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Connectivity
- 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 Can't My ECS Access the Internet Even After an EIP Is Bound?
- What Should I Do If an EIP Cannot Be Pinged?
- How Do I Unblock an EIP?
- Why Is There Network Jitter or Packet Loss During Cross-Border Communications?
- Why Does the Download Speed of My ECS Is Slow?
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Product Consultation
- Videos
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More Documents
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User Guide (ME-Abu Dhabi Region)
- Service Overview
- Quick Start
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Elastic IP
- EIP Overview
- Assigning an EIP and Binding It to an ECS
- Assigning an EIP
- Binding an EIP to an Instance
- Unbinding an EIP from an Instance
- Releasing an EIP
- Changing Dedicated Bandwidth Size of an EIP
- Unbinding an EIP from an ECS and Releasing the EIP
- Modifying an EIP Bandwidth
- Exporting EIP Information
- Managing EIP Tags
- Shared Bandwidth
- Monitoring
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FAQs
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Product Consultation
- What Is a Quota?
- How Do I Assign or Retrieve a Specific EIP?
- Why Is an EIP Newly Assigned the Same as the One I Released?
- What Are the Differences Between EIP, Private IP Address, and Virtual IP Address?
- Can an EIP That Uses Dedicated Bandwidth Be Changed to Use Shared Bandwidth?
- Can I Bind an EIP to Multiple ECSs?
- What Are the Differences Between the Primary and Extension NICs of ECSs?
- What Is the EIP Assignment Policy?
- Can I Assign a Specific EIP?
- Can a Bandwidth Be Used by Multiple Accounts?
- How Do I Unbind an EIP from an Instance and Bind a New EIP to the Instance?
- Why Can't I Find My Assigned EIP on the Management Console?
- EIP Binding and Unbinding
-
Bandwidth
- What Is the Bandwidth Size Range?
- How Do I Increase a Bandwidth to Be More Than 300 Mbit/s?
- What Bandwidth Types Are Available?
- Is There a Limit to the Number of EIPs That Can Be Added to Each Shared Bandwidth?
- What Are the Differences Between a Dedicated Bandwidth and a Shared Bandwidth?
- What Are Inbound Bandwidth and Outbound Bandwidth?
- How Do I Know If My EIP Bandwidth Limit Has Been Exceeded?
- What Are the Differences Between Public Bandwidth and Private Bandwidth?
- What Is the Relationship Between Bandwidth and Upload/Download Rate?
- Connectivity
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Product Consultation
- Change History
- API Reference (ME-Abu Dhabi Region)
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User Guide (Kuala Lumpur Region)
- Service Overview
- Quick Start
- EIP
- Shared Bandwidth
- Monitoring
-
FAQs
- Product Consultation
- EIP Binding and Unbinding
-
Bandwidth
- What Is the Bandwidth Size Range?
- What Bandwidth Types Are Available?
- Is There a Limit to the Number of EIPs That Can Be Added to Each Shared Bandwidth?
- What Are the Differences Between a Dedicated Bandwidth and a Shared Bandwidth? Can a Dedicated Bandwidth Be Changed to a Shared Bandwidth or the Other Way Around?
- Connectivity
- Change History
- API Reference (Kuala Lumpur Region)
- User Guide (Ankara Region)
- API Reference (Ankara Region)
-
User Guide (ME-Abu Dhabi Region)
- General Reference
- Symptom
- Fault Locating
- Checking Security Group Rules
- Checking Firewall Settings
- Checking Whether Ping Operations Have Been Disabled on the ECS
- Checking ACL Rules
- Checking Whether the Network Is Functional
- Checking the ECS Route Configuration If Multiple NICs Are Used
- Checking Domain Name Resolution If the Domain Name Cannot Be Pinged
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What Should I Do If an EIP Cannot Be Pinged?
Symptom
After you purchase an EIP and bind it to an ECS, the local host or other cloud servers cannot ping the EIP of the ECS.
Fault Locating
The following fault causes are sequenced based on their occurrence probability.
If the fault persists after you have ruled out a cause, check other causes.
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Possible Cause |
Solution |
---|---|
ICMP access rules are not added to the security group. |
Add ICMP access rules to the security group. For details, see Checking Security Group Rules. |
Ping operations are prohibited on the firewall. |
Allow ping operations on the firewall. For details, see Checking Firewall Settings. |
Ping operations are prohibited on the ECS. |
Allow ping operations on the ECS. For details, see Checking Whether Ping Operations Have Been Disabled on the ECS. |
Network ACL is associated. |
If the VPC is associated with a network ACL, check the network ACL rules. For details, see Checking ACL Rules. |
A network exception occurred. |
Use another ECS in the same region to check whether the local network is functional. For details, see Checking Whether the Network Is Functional. |
Routes are incorrectly configured if multiple NICs are used. |
If the network is inaccessible due to an extension NIC, the fault is generally caused by incorrect route configurations. To resolve this issue, see Checking the ECS Route Configuration If Multiple NICs Are Used. |
The domain name is not ICP licensed. |
If the domain name cannot be pinged or cannot be resolved, see Checking Domain Name Resolution If the Domain Name Cannot Be Pinged to resolve this issue. |
Checking Security Group Rules
ICMP is used for the ping command. Check whether the security group accommodating the ECS allows ICMP traffic.
- Under Computing, click Elastic Cloud Server.
- On the Elastic Cloud Server page, click the name of the target ECS.
The page providing details about the ECS is displayed.
- Click the Security Groups tab, expand the information of the security group, and view security group rules.
- Click the security group ID.
The system automatically switches to the Security Group page.
- On the Outbound Rules page, click Add Rule. In the displayed dialog box, set required parameters to add an outbound rule.
Figure 2 Adding an outbound rule
Table 2 Security group rules Transfer Direction
Type
Protocol/Port Range
Source
Outbound
IPv4
ICMP/Any
0.0.0.0/0
0.0.0.0/0 indicates all IP addresses.
- On the Inbound Rules tab, click Add Rule. In the displayed dialog box, set required parameters to add an inbound rule.
Figure 3 Adding an inbound rule
Table 3 Security group rules Transfer Direction
Type
Protocol/Port Range
Source
Inbound
IPv4
ICMP/Any
0.0.0.0/0
0.0.0.0/0 indicates all IP addresses.
- Click OK to complete the security rule configuration.
Checking Firewall Settings
If a firewall is enabled on the ECS, check whether the firewall blocks the ping operations.
- Consider CentOS 7 as an example. Run the following command to check the firewall status:
If running is displayed in the command output, the firewall has been enabled.
- Check whether there is any ICMP rule blocking the ping operations.
If the command output shown in Figure 4 is displayed, there is no ICMP rule blocking the ping operations.
If the ping operations are blocked by an ICMP rule, run the following commands to modify the rule for unblocking:
iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
iptables -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT
- Log in to the Windows ECS, click the Windows icon in the lower left corner of the desktop, and choose Control Panel > Windows Firewall.
- Click Turn Windows Firewall on or off.
View and set the firewall status.
- If the firewall is On, go to 4.
- Check the ICMP rule statuses in the firewall.
- In the navigation pane on the Windows Firewall page, click Advanced settings.
- Enable the following rules:
Inbound Rules: File and Printer Sharing (Echo Request - ICMPv4-In)
Outbound Rules: File and Printer Sharing (Echo Request - ICMPv4-Out)
If IPv6 is enabled, enable the following rules:
Inbound Rules: File and Printer Sharing (Echo Request - ICMPv6-In)
Outbound Rules: File and Printer Sharing (Echo Request - ICMPv6-Out)
Figure 5 Inbound RulesFigure 6 Outbound Rules
Checking Whether Ping Operations Have Been Disabled on the ECS
Windows
Enable ping operations using the CLI.
- Start the Run dialog box. Enter cmd and press Enter.
- Run the following command to enable ping operations:
Linux
- Check the net.ipv4.icmp_echo_ignore_all value in the /etc/sysctl.conf file. Value 0 indicates that ping operations are allowed, and value 1 indicates that ping operations are prohibited.
- Allow ping operations.
Checking ACL Rules
By default, no ACL is configured for a VPC. If a network ACL is associated with a VPC, check the ACL rules.
- Check whether the subnet of the ECS has been associated with a network ACL.
If an ACL name is displayed, the network ACL has been associated with the ECS.
- Click the ACL name to view its status.
- If the network ACL is enabled, add an ICMP rule to allow traffic.
NOTE:
The default network ACL rule denies all incoming and outgoing packets. If a network ACL is disabled, the default rule is still effective.
Checking Whether the Network Is Functional
- Use another ECS in the same region to check whether the local network is functional.
Use another ECS in the same region to ping the affected EIP. If the EIP can be pinged, the VPC is functional. In such a case, rectify the local network fault and ping the affected EIP again.
- Check whether the link is accessible.
A ping failure is caused by packet loss or long delay, which may be caused by link congestion, link node faults, or heavy load on the ECS.
Checking the ECS Route Configuration If Multiple NICs Are Used
Generally, the default route of an OS will preferentially select the primary NIC. If an extension NIC is selected in a route and the network malfunctions, this issue is typically caused by incorrect route configuration.
- If the ECS has multiple NICs, check whether the default route is available.
- Log in to the ECS and run the following command to check whether the default route is available:
ip route
Figure 7 Default route - If the route is unavailable, run the following command to add it:
ip route add default via XXXX dev eth0
NOTE:
In the preceding command, XXXX specifies a gateway IP address.
- Log in to the ECS and run the following command to check whether the default route is available:
- If the ECS has multiple NICs and the EIP is bound to an extension NIC, configure policy routing on the ECS for network communication with the extension NIC.
Checking Domain Name Resolution If the Domain Name Cannot Be Pinged
If you can ping the EIP but not the domain name, the possible cause is that an error occurred in domain name resolution.
- Check the domain name resolution.
If the domain name records are incorrectly configured, the domain name may fail to be resolved.
Switch to the DNS management console to view details about the domain name resolution.
- Check the DNS server configuration.
If the system shows no server found after you ping a domain name, this issue may be caused by slow response from the DNS server.
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