Getting Started with Citrix ADC
Deploy a Citrix ADC VPX instance
Install a Citrix ADC VPX instance on Microsoft Hyper-V servers
Install a Citrix ADC VPX instance on Linux-KVM platform
Prerequisites for Installing Citrix ADC VPX Virtual Appliances on Linux-KVM Platform
Provisioning the Citrix ADC Virtual Appliance by using OpenStack
Provisioning the Citrix ADC Virtual Appliance by using the Virtual Machine Manager
Configuring Citrix ADC Virtual Appliances to Use SR-IOV Network Interface
Configuring Citrix ADC Virtual Appliances to use PCI Passthrough Network Interface
Provisioning the Citrix ADC Virtual Appliance by using the virsh Program
Provisioning the Citrix ADC Virtual Appliance with SR-IOV, on OpenStack
Configuring a Citrix ADC VPX Instance on KVM to Use OVS DPDK-Based Host Interfaces
Deploy a Citrix ADC VPX instance on Microsoft Azure
Network architecture for Citrix ADC VPX instances on Microsoft Azure
Configure a high-availability setup with multiple IP addresses and NICs
Configure a high-availability setup with multiple IP addresses and NICs by using PowerShell commands
Configure address pools (IIP) for a Citrix Gateway appliance
配置多个IP地址的Citrix ADC VPX instance in standalone mode by using PowerShell commands
Upgrade and downgrade a Citrix ADC appliance
Solutions for Telecom Service Providers
Load Balance Control-Plane Traffic that is based on Diameter, SIP, and SMPP Protocols
提供DNS基础设施/交通服务,等as, Load Balancing, Caching, and Logging for Telecom Service Providers
Provide Subscriber Load Distribution Using GSLB Across Core-Networks of a Telecom Service Provider
Authentication, authorization, and auditing application traffic
Configuring authentication, authorization, and auditing policies
Configuring Authentication, authorization, and auditing with commonly used protocols
Use an on-premises Citrix Gateway as the identity provider for Citrix Cloud
Troubleshoot authentication issues in Citrix ADC and Citrix Gateway with aaad.debug module
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Persistence and persistent connections
Advanced load balancing settings
Gradually stepping up the load on a new service with virtual server–level slow start
Protect applications on protected servers against traffic surges
Retrieve location details from user IP address using geolocation database
Use source IP address of the client when connecting to the server
Use client source IP address for backend communication in a v4-v6 load balancing configuration
Set a limit on number of requests per connection to the server
Configure automatic state transition based on percentage health of bound services
使用中科院e 2: Configure rule based persistence based on a name-value pair in a TCP byte stream
使用中科院e 3: Configure load balancing in direct server return mode
使用中科院e 6: Configure load balancing in DSR mode for IPv6 networks by using the TOS field
使用中科院e 7: Configure load balancing in DSR mode by using IP Over IP
使用中科院e 10: Load balancing of intrusion detection system servers
使用中科院e 12: Configure Citrix Virtual Desktops for load balancing
使用中科院e 14: ShareFile wizard for load balancing Citrix ShareFile
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Authentication and authorization
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Configuring a CloudBridge Connector Tunnel between two Datacenters
Configuring CloudBridge Connector between Datacenter and AWS Cloud
Configuring a CloudBridge Connector Tunnel Between a Datacenter and Azure Cloud
Configuring CloudBridge Connector Tunnel between Datacenter and SoftLayer Enterprise Cloud
Configuring a CloudBridge Connector Tunnel Between a Citrix ADC Appliance and Cisco IOS Device
CloudBridge Connector Tunnel Diagnostics and Troubleshooting
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使用中科院e 3: Configure load balancing in direct server return mode
Load balancing in direct server return (DSR) mode allows the server to respond to clients directly by using a return path that does not flow through the Citrix ADC appliance. In DSR mode, however, the appliance can continue to perform health checks on services. In a high-data volume environment, sending server traffic directly to the client in DSR mode increases the overall packet handling capacity of the appliance because the packets do not flow through the appliance.
DSR mode has the following features and limitations:
- It supports one-arm mode and inline mode.
- The appliance ages out sessions based on idle timeout.
- Because the appliance does not proxy TCP connections (that is it does not send SYN-ACK to the client), it does not completely shut out SYN attacks. By using the SYN packet rate filter, you can control the rate of SYNs to the server. To control the rate of SYNs, set a threshold for the rate of SYNs. To get protection from SYN attacks, you must configure the appliance to proxy TCP connections. However, that requires the reverse traffic to flow through the appliance.
- In a DSR configuration, the Citrix ADC appliance does not replace the load balancing virtual server’s IP address with the destination server’s IP address. Instead, it forwards packets to a service by using the server’s MAC address. The VIP must be configured on the server and ARP must be disabled for the VIP which is configured on the server to prevent the client request from bypassing the appliance when it is configured in one-arm mode. For example, a user needs to configure VIP in the loopback interface and disable the ARP for the same VIP.
- 设备获得服务器的MAC地址摇来摇去m the monitor bound to the service. However, custom user monitors (monitors of type USER), which use scripts stored on the Citrix ADC appliance, do not learn a server’s MAC address. If you use only custom monitors in a DSR configuration, for each request the virtual server receives, the appliance attempts to resolve the destination IP address to a MAC address (by sending ARP requests). Because the destination IP address is a virtual IP address owned by the Citrix ADC appliance, the ARP requests always resolve to the MAC address of the Citrix ADC interface. Consequently, all traffic received by the virtual server is looped back to the appliance. If you use user monitors in a DSR configuration, you must also configure another monitor of a different type (for example, a PING monitor) for the services, ideally with a longer interval between probes, so that the MAC address of the servers can be learned.
- The Citrix ADC appliance learns the server L2 parameters from the monitor that is bound to the service. For UDP-ECV monitors, configure a receive string to enable the appliance to learn the L2 parameters of the server. If the receive string is not configured and the server does not respond, then the appliance does not learn the L2 parameters but the service is set to UP. The traffic for this service is blackholed.
In the example scenario, the services Service-ANY-1, Service-ANY-2, and Service-ANY-3 are created and bound to the virtual server Vserver-LB-1. The virtual server load balances the client request to a service, and the service responds to clients directly, bypassing the Citrix ADC appliance. The following table lists the names and values of the entities configured on the Citrix ADC appliance in DSR mode.
Entity type | Name | IP address | Protocol |
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Virtual server | Vserver-LB-1 | 10.102.29.94 | ANY |
Services | Service-ANY-1 | 10.102.29.91 | ANY |
Service-ANY-2 | 10.102.29.92 | ANY | |
Service-ANY-3 | 10.102.29.93 | ANY | |
Monitors | TCP | None | None |
The following diagram shows the load balancing entities and values of the parameters to be configured on the appliance.
Figure 1. Entity Model for Load Balancing in DSR Model
For the appliance to function correctly in DSR mode, the destination IP in the client request must be unchanged. Instead, the appliance changes the destination MAC to that of the selected server. This setting enables the server to determine the client MAC address for forwarding requests to the client while bypassing the server.
Next, you configure a basic load balancing setup as described inSetting Up Basic Load Balancing, naming the entities and setting the parameters using the values described in the previous table.
After you configure the basic load balancing setup, you must customize it for DSR mode. To do this, you configure a supported load balancing method, such as the Source IP Hash method with a sessionless virtual server. You also need to set the redirection mode to allow the server to determine the client MAC address for forwarding responses and bypass the appliance.
在您配置负载平衡方法和redirection mode, you need to enable the USIP mode on each service. The service then uses the source IP address when forwarding responses.
To configure the load balancing method and redirection mode for a sessionless virtual server by using the command line interface
At the command prompt, type:
set lb vserver -lbMethod -m -sessionless
Example
set lb vserver Vserver-LB-1 -lbMethod SourceIPHash -m MAC -sessionless enabled
Note
For a service that is bound to a virtual server on which -m MAC option is enabled, you must bind a non-user monitor.
To configure the load balancing method and redirection mode for a sessionless virtual server by using the configuration utility
- Navigate to Traffic Management > Load Balancing > Virtual Servers.
- 打开一个虚拟服务器,选择重定向模式MAC Based, and method as SOURCEIPHASH.
- In Traffic Settings, select Sessionless Load Balancing.
To configure a service to use source IP address by using the command line interface
At the command prompt, type:
set service -usip
Example:
set service Service-ANY-1 -usip yes
To configure a service to use source IP address by using the configuration utility
- Navigate to Traffic Management > Load Balancing > Services.
- Open a service, and in Traffic Settings, select Use Source IP Address.
Some additional steps are required in certain situations, which are described in the succeeding sections.
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In this article
- To configure the load balancing method and redirection mode for a sessionless virtual server by using the command line interface
- To configure the load balancing method and redirection mode for a sessionless virtual server by using the configuration utility
- To configure a service to use source IP address by using the command line interface
- To configure a service to use source IP address by using the configuration utility
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