Common Questions Overview

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BLB BLB

  • API Reference
    • Access control
    • API Service Domain Name
    • Appendix
    • Application BLB Interface
      • Application BLB Instance Related Interfaces
      • Application BLB Listener Related Interfaces
      • Application BLB Security Group Related Interfaces
      • Application BLB Server Group Related Interfaces
    • Application IPv6 BLB Interface
      • Application IPv6 BLB Instance Related Interfaces
      • Application IPv6 BLB Listener Related Interfaces
      • Application IPv6 BLB Security Group Related Interfaces
      • Application IPv6 BLB Server Group Related Interfaces
    • BLB Order Related Interfaces
      • BLB - Resize
      • BLB Charge Shift - Cancel Prepay to Postpay
      • BLB Charge Shift - Postpay to Prepay
      • BLB Charge Shift - Prepay to Postpay
      • BLB Inquiry
      • BLB Unsubscribe Interface
    • Document Update Records
    • Error code
    • Interface Specifications
    • Introduction
    • Load Balancer Dedicated Cluster LBDC Interface
      • LBDC Instance Related Interfaces
    • Service Publishing Point Interface
      • Service Publishing Point Related Interfaces
    • Standard BLB Interface
      • Standard BLB Instance Related Interfaces
      • Standard BLB Listener Related Interfaces
      • Standard BLB Real Server Related Interfaces
      • Standard BLB Security Group Related Interfaces
    • Standard IPv6 BLB Interface
      • Standard IPv6 BLB Related Interfaces
  • FAQs
    • Billing Problems
    • Common Questions Overview
    • Configuration-related questions
    • Fault-related questions
    • General Problems
    • Load Balancer Dedicated Cluster Related Issues
    • Performance-related questions
    • Security Problems
  • Function Release Records
  • Operation guide
    • Access control
    • Access Logs
    • Application BLB instance
    • Application IPv6 Instance
    • BLB metric description
    • Certification
    • Custom configuration
    • Extended domain name
    • General-purpose BLB instance
      • Creating BLB Ordinary Instance
      • Managing BLB Ordinary Instance
    • General-purpose IPv6 BLB instance
    • Identity and access management
    • IP Group Usage Guide
    • Load Balance Dedicated Cluster
    • Load Balancer Frontend and Backend Protocol Correspondence
    • Recording Access Logs Using VPC Flow Logs
    • Service Release Point
    • Tag Management
  • Product Description
    • Application scenarios
    • Basic Architecture
    • Basic concepts
    • Performance Specification Description
    • Product advantages
    • Product features
    • Product Introduction
    • Usage restrictions
  • Product pricing
    • Load Balancer Dedicated Cluster Billing
    • Load Balancer Instance Billing
  • Quick Start
  • SDK
    • GO-SDK
      • Application BLB Instance
      • Initialization
      • Install
      • IPv6 BLB Instance
      • Load Balance Dedicated Cluster (LBDC)
      • Ordinary BLB Instance
      • Overview
      • Service Release Point
      • Version Change Records
    • Java-SDK
      • Application BLB instance
      • General-purpose BLB instance
      • Initialization
      • Install the SDK Package
      • IPv6 BLB Instance
      • Load Balance Dedicated Cluster (LBDC)
      • Overview
      • Service Release Point
      • Version Update Description
    • PHP-SDK
      • Initialization
      • Install
      • Ordinary BLB Instance
      • Overview
    • Python-SDK
      • Application BLB Instance
      • Initialization
      • Install
      • IPv6 BLB Instance
      • Load Balance Dedicated Cluster (LBDC)
      • Ordinary BLB Instance
      • Overview
      • Service Release Point
      • Version Update Description
  • Service Level Agreement (SLA)
    • Description of Baidu AI Cloud Load Balancer Trusted Cloud certification service availability
    • LBDC Service Level Agreement SLA
    • BLB Service Level Agreement (V2.0)
  • Typical Practices
    • BLB Selection Guide
    • Health Check Exception Troubleshooting
    • Implementing BLB Association with Listeners, Real Servers, Security Groups, etc. via Terraform
    • Implementing Multi-Site Hosting via Application BLB
    • Load Balancer Security Protection Strategy
    • Managing BLB via Terraform
    • Obtaining Client Information via Application BLB Instance
    • Using IP Group Function to Mount Real Servers Across VPCs in Different Regions
    • Using IP Group Function to Mount Real Servers Across VPCs in the Same Region
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Table of contents on this page
  • General Problems
  • Performance-related questions
  • Fault-related questions
  • Configuration-related questions
  • Security Problems
  • Billing Problems
  • Dedicated Cluster Problems

Common Questions Overview

Updated at：2025-10-16

General Problems

  • [Can BLB support non-Baidu Cloud Compute (BCC) machines?](BLB/FAQs/General Problems.md#Can BLB support non-Baidu Cloud Compute (BCC) machines?)
  • [What is the difference between enabling and disabling public network access for a BLB instance?](BLB/FAQs/General Problems.md#BLB Instance Enable/What is the difference between enabling and disabling public network access for a BLB instance)
  • [Can I set up a load sharing service on Baidu AI Cloud?](BLB/FAQs/General Problems.md#Can I set up a load sharing service on Baidu AI Cloud?)
  • [The total count of BLB instances exceeds the upper limit. Can the current service needs increase the BLB quota?](BLB/FAQs/General Problems.md#The total count of BLB instances exceeds the upper limit. Can the current service needs increase the BLB quota?)
  • [The real server does not have a public network EIP. Can I access the public network through BLB?](BLB/FAQs/General Problems.md#The real server does not have a public network EIP. Can I access the public network through BLB?)
  • [Does BLB support IPv6?](BLB/FAQs/General Problems.md#Does BLB support IPv6?)
  • [Can Windows OS use BLB?](BLB/FAQs/General Problems.md#Can Windows OS use BLB?)
  • Explanation on the intranet IP of a Ping load balancer instance
  • Explanation on Telnet load balancer listener ports
  • Under what circumstances is HTTPS mutual authentication required?
  • Does BLB support mounting different ports of the same real server under the same listener?
  • Does BLB support creating multiple listeners with different protocols on the same port?
  • Does BLB support cross-VPC access within the same region?
  • Does BLB communicate with real cloud server via public network or intranet?
  • What are the differences between BLB's UDP and TCP protocols?
  • Which TCP ports can BLB perform load balancing for?
  • What is the length limit of request forwarded by BLB? Adjustment supported or not?
  • How is BLB cascading scenario used?
  • What is the principles of achieving session persistence by load balancer cookies?
  • What port does HTTPS listener use?
  • Why does traffic statistics decline after changing TCP listeners to HTTPS/HTTP listeners?
  • What is real server weight?
  • What are the explanations and potential causes for request responses with status codes 500, 502, 503, or 504?
  • How to check for request imbalance?
  • How to check high latency in load balancer service access?
  • Does BLB instance support client IP passthrough?
  • The BLB instance's real servers send back responses to the request in batches, but the client sees that only one request is received. Does BLB support not caching the response requests from real servers?
  • What scheduling algorithms does the BLB product support?
  • What are the differences between standard BLB and application BLB?
  • Under what circumstances should BLB be purchased together with EIP?

Performance-related questions

  • [What is the maximum count of BLB instances a user can create?](BLB/FAQs/Performance-related questions.md#What is the maximum count of BLB instances a user can create?)
  • [Does BLB impose bandwidth restrictions?](BLB/FAQs/Performance-related questions.md#Does BLB impose bandwidth restrictions?)
  • [What forwarding rules does BLB support?](BLB/FAQs/Performance-related questions.md#What forwarding rules does the BLB support?)
  • [What monitor information does BLB currently provide?](BLB/FAQs/Performance-related questions.md#What monitor information does BLB currently provide?)
  • [How is health check implemented?](BLB/FAQs/Performance-related questions.md#How is health check implemented?)
  • [How to get the visitor's real IP?](BLB/FAQs/Performance-related questions.md#How to get the visitor's real IP?)
  • [Does BLB support session persistence function?](BLB/FAQs/Performance-related questions.md#Does BLB support session persistence function?)
  • [Does real BCC require Internet bandwidth? Is this related to BLB's service capabilities?](BLB/FAQs/Performance-related questions.md#Does the backend BCC require external network bandwidth Is this related to the service capabilities of BLB)
  • [Does BLB have DDOS protection function?](BLB/FAQs/Performance-related questions.md#Does BLB have DDOS protection capabilities?)
  • Does the load balancer support Jumbo frames forwarding?

Fault-related questions

  • [Will BCC instance anomalies affect BLB service?](BLB/FAQs/Fault-related questions.md#Will BCC instance anomalies affect BLB service?)
  • [How to do if health check status remains abnormal?](BLB/FAQs/Fault-related questions.md#How to do if health check status remains abnormal?)
  • [When the forwarding rule is source IP, is loopback prevention supported?](BLB/FAQs/Fault-related questions.md#When the forwarding rule is source IP, is loopback prevention supported?)
  • How to do if network connectivity fails when accessing load balancer TCP/UDP/ICMP protocols via IP shard?
  • Why can't client access the load balancer?

Configuration-related questions

  • [TCP timeout configuration?](BLB/FAQs/Configuration-related questions.md#TCP Timeout Configuration?)
  • [Can real servers send requests to associated load balancer instances?](BLB/FAQs/Configuration-related questions.md#Can real servers send requests to associated load balancer instances?)
  • [Are there relatively reasonable recommended values for health check configurations?](BLB/FAQs/Configuration-related questions.md#Are there relatively reasonable recommended values for health check configurations?)
  • [Can a group of cloud server instances host multiple websites to perform load balancing simultaneously?](BLB/FAQs/Configuration-related questions.md#Can a group of cloud server instances host multiple websites to perform load balancing simultaneously?)
  • [What protocols does BLB support?](BLB/FAQs/Configuration-related questions.md#What protocols does BLB support?)
  • [Can the same BLB configure two HTTPS certificates to listen ports 443 and 442 respectively?](BLB/FAQs/Configuration-related questions.md#Can the same BLB configure two HTTPS certificates to listen ports 443 and 442 respectively?)
  • [Can a server be configured on two different BLBs?](BLB/FAQs/Configuration-related questions.md#Can a server be configured on two different BLBs?)
  • [In BLB listener settings, what is the difference between TCP listener and HTTP listener?](BLB/FAQs/Configuration-related questions.md#In BLB listener settings, what is the difference between TCP listener and HTTP listener?)
  • [Among the multiple IPs obtained by the load balancer, which one is the real IP of the end user?](BLB/FAQs/Configuration-related questions.md#Among the multiple IPs obtained by the load balancer, which one is the real IP of the end user?)
  • [How to perform regular comprehensive checks on the status of BLB resources?](BLB/FAQs/Configuration-related questions.md#How to perform regular comprehensive checks on the status of BLB resources?)
  • [Why does the health check fail when an application BLB mounts an IDC server via an IP group?](BLB/FAQs/Configuration-related questions.md#Why does the health check fail when an application BLB mounts an IDC server via an IP group?)
  • Explanation on intranet loopback issues
  • The difference between setting the real server weight to 0 and deleting the RS in Layer 7 Load Balancer?
  • The difference between setting the backend RS weight to 0 and deleting the RS in Layer 7 Load Balancer
  • When there is few connections on the listener, why do the connections of each real server with the same weight under WRR or RR scheduling strategies differ?
  • Why can the Layer 4 Load Balancer's source IP still receive and process traffic after the real server weight is set to 0 by hash scheduling algorithm?
  • How to handle existing connections on a real server deleted from a Layer 4 Load Balancer?
  • How to enable WebSocket support?
  • Is it possible to upgrade a shared load balancer to a specification load balancer without service interruption?
  • Does LB support uploading certificate?
  • How many HTTPS certificates can be bound to a single listener?
  • Are certificates region-specific?
  • Does the certificate need to be uploaded to the real server?
  • HTTP and HTTPS use the same real server to provide services, the user can access HTTP listener normally, but access HTTPS abnormally with typesetting error. How to solve this problem?
  • Does traffic continue to be forwarded after a listener is released in BLB?
  • Can the load balancer directly get the client IP address?
  • The user still doesn't get real client IP although x-forwarded-for is enabled. How to solve this problem?
  • Can the count of real severs be adjusted while the load balancer is running?
  • Does IPv6-BLB fail to mount BBC/BCC?
  • Does BLB support ECC-P256 server certificates and CA certificates?
  • How does BLB associate with a security group?
  • How to modify the health check configuration of a listener?
  • Is the source IP network segment for load balancer health check probe 100.64.0.0/10?
  • How to handle health check alerts?
  • The health check indicates normal status, but the service remains inaccessible. How to solve this problem?
  • Is the health check frequency of BLB too high?
  • How long does it take for the health check status of real servers on the BLB console to change?
  • Why are IPs from the 100 network segment accessing real servers?
  • Why are IPs from the 100 network segment accessing real servers?
  • With CIP pass-through enabled on the LB instance, why can the server still receive connection requests from addresses in the 100.64.0.0/10 network segment?
  • Why does server still receive a large number of connection requests from source IPs ending with 3 and 4 within the 100640010- network segment?
  • How to check the status of the real servers of a load balancer instance?
  • How long does it take for a real server that is added with a load balancer instance to start handling traffic?
  • I find many health check requests on real servers sent from 100-segment IPs. Will the count of requests decrease later?

Security Problems

  • [Many IP addresses are frequently accessing my BCC. What is the reason?](BLB/FAQs/Security Problems.md#Many IP addresses are frequently accessing my BCC. What is the reason?)
  • [Does BLB support the HTTPS?](BLB/FAQs/Security Problems.md#Does BLB support the HTTPS?)
  • [Can BLB prevent attacks?](BLB/FAQs/Security Problems.md#Can BLB prevent attacks?)

Billing Problems

  • [Will BCC's joining BLB change its billing rules?](BLB/FAQs/Billing Problems.md#Will BCC's joining BLB change its billing rules?)
  • [Will the traffic generated by the health check be counted into the billed traffic?](BLB/FAQs/Billing Problems.md#Will the traffic generated by the health check be counted into the billed traffic?)
  • [What metering data does BLB provide?](BLB/FAQs/Billing Problems.md#What metering data does BLB provide?)

Dedicated Cluster Problems

  • I have purchased a dedicated cluster, why can't I see it when I create a BLB instance?
  • For BLB instances created on dedicated clusters, how to choose between active-standby mode and active-active mode?
  • When BLB instances migrate between dedicated clusters, shared clusters or different dedicated clusters, will data flow be lossy? How long will the expected lossiness duration be?
  • Will data flow be lossy during switching of BLB instances in a dedicated cluster from active-standby data centers to active-standby or active-active mode? How long will the expected lossiness duration be?
  • I have purchased a dedicated cluster, why can't I see it when I create a BLB instance?
  • For BLB instances created on dedicated clusters, how to choose between active-standby mode and active-active mode?
  • When BLB instances migrate between dedicated clusters, shared clusters or different dedicated clusters, will data flow be lossy? How long will the expected lossiness duration be?
  • Will data flow be lossy during switching of BLB instances in a dedicated cluster from active-standby data centers to active-standby or active-active mode? How long will the expected lossiness duration be?

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