Getting Started with Citrix ADC
Deploy a Citrix ADC VPX instance
Optimize Citrix ADC VPX performance on VMware ESX, Linux KVM, and Citrix Hypervisors
Apply Citrix ADC VPX configurations at the first boot of the Citrix ADC appliance in cloud
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
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 multiple IP addresses for a Citrix ADC VPX standalone instance
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 a Citrix ADC VPX instance to use Azure accelerated networking
Configure HA-INC nodes by using the Citrix high availability template with Azure ILB
Configure a high-availability setup with Azure external and internal load balancers simultaneously
Configure address pools (IIP) for a Citrix Gateway appliance
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
Provide Subscriber Load Distribution Using GSLB Across Core-Networks of a Telecom Service Provider
Authentication, authorization, and auditing application traffic
Basic components of authentication, authorization, and auditing configuration
On-premises Citrix Gateway as an identity provider to Citrix Cloud
Authentication, authorization, and auditing configuration for commonly used protocols
Troubleshoot authentication and authorization related issues
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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
Use case 2: Configure rule based persistence based on a name-value pair in a TCP byte stream
Use case 6: Configure load balancing in DSR mode for IPv6 networks by using the TOS field
Use case 7: Configure load balancing in DSR mode by using IP Over IP
Use case 10: Load balancing of intrusion detection system servers
Use case 11: Isolating network traffic using listen policies
Use case 14: ShareFile wizard for load balancing Citrix ShareFile
Use case 15: Configure layer 4 load balancing on the Citrix ADC appliance
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Authentication and authorization for System Users
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Configuring a CloudBridge Connector Tunnel between two Datacenters
Configuring CloudBridge Connector between Datacenter and AWS Cloud
配置一个CloudBridge连接器之间的隧道a Citrix ADC Appliance and Virtual Private Gateway on AWS
Configuring CloudBridge Connector Tunnel between Datacenter and SoftLayer Enterprise Cloud
配置一个CloudBridge连接器之间的隧道a Citrix ADC Appliance and Cisco IOS Device
配置一个CloudBridge连接器之间的隧道a Citrix ADC Appliance and Fortinet FortiGate Appliance
CloudBridge Connector Tunnel Diagnostics and Troubleshooting
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Synchronizing Configuration Files in a High Availability Setup
Restricting High-Availability Synchronization Traffic to a VLAN
Understanding the High Availability Health Check Computation
Managing High Availability Heartbeat Messages on a Citrix ADC Appliance
Remove and Replace a Citrix ADC in a High Availability Setup
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Configure negative caching of DNS records
The Citrix ADC appliance supports caching of negative responses for a domain. A negative response indicates that information about a requested domain does not exist, or that the server cannot provide an answer for the query. The storage of this information is called negative caching. Negative caching helps speed up responses to queries about a domain.
Note:
Negative caching is supported only when the back-end server is configured as an authoritative DNS (ADNS) server for the queried domain.
A negative response can be one of the following:
- NXDOMAIN error message — The authoritative DNS servers respond with the NXDOMAIN error message when the queried domain name does not have any records configured on the server. This message implies that the queried domain is an invalid or a non-existent domain name.
- NODATA error message — If the domain name in the query is valid but records of the given type are not available, the appliance sends a NODATA error message.
-启用缓存时,设备caches the negative response from the DNS server and serves the future requests from the cache only. This action helps speed up responses to queries and also to reduce the back-end DNS traffic. Negative caching can be used in all deployments, that is, when a Citrix ADC appliance is serving as a proxy, as an end resolver, or as a forwarder.
You can enable or disable negative caching using a DNS profile, for more information see,DNS profiles. By default, negative caching is enabled in the default DNS profile (default-dns-profile
) that are bound by default to a DNS virtual server or in the newly created DNS profile.
Enable or disable negative caching by using the CLI
At the command prompt, type the following commands to enable or disable negative caching and verify the configuration:
- add dns profile [-cacheRecords ( ENABLED | DISABLED )] [-cacheNegativeResponses (ENABLED | DISABLED )] - show dns profile []
Example of a default DNS profile:
> sh dns profile default-dns-profile 1) default-dns-profile Query logging : DISABLED Answer section logging : DISABLED Extended logging : DISABLED Error logging : DISABLED Cache Records : ENABLED Cache Negative Responses: ENABLED Done
Example of a newly created DNS profile:
> add dnsprofile dns_profile1 -cacheRecords ENABLED -cacheNegativeResponses ENABLED Done > show dns profile dns_profile1 1) dns_profile1 Query logging : DISABLED Answer section logging : DISABLED Extended logging : DISABLED Error logging : DISABLED Cache Records : ENABLED Cache Negative Responses: ENABLED Done
Specify service or virtual server level DNS parameters by using the CLI
At the command prompt, perform the following:
Configure the DNS profile.
add dns profile
[-cacheRecords ( ENABLED | DISABLED )] [-cacheNegativeResponses (ENABLED | DISABLED )] Bind the DNS profile to the service or virtual server.
To bind the DNS profile to the service:
set service
[-dnsProfileName ]
Example:
>set service service1 -dnsProfileName dns_profile1 Done
To bind the DNS profile to the virtual server:
set lb vserver
Example:
>set lb vserver lbvserver1 -dnsProfileName dns_profile1 Done
Specify service or virtual server level DNS parameters by using the GUI
Configure the HTTP profile.
Navigate toSystem>Profiles>DNS Profile, and create the DNS profile.
Bind the HTTP profile to the service or virtual server.
Navigate toTraffic Management>Load Balancing>Services/Virtual Servers, and create the DNS profile, that must be bound to the service or the virtual server.
Rate limiting negative response served by the appliance
You can set a threshold for negative responses being served by the Citrix ADC appliance from the cache. When the threshold is set, the appliance serves the response from the cache until the threshold is reached. Once the threshold is reached, the appliance drops the requests instead of responding with an NXDOMAIN response.
Setting a rate limit for negative responses has the following advantages.
- Save the resources on the Citrix ADC appliance.
- Prevent any malicious queries for non-existent domain names.
Note:You can set a threshold for negative responses only for the domains for which the ADC appliance is configured as an authoritative domain name server. You cannot set a threshold for cached records received from the authoritative back-end name servers.
Rate limiting negative response served by the cache by using the CLI
At the command prompt, type
set dns parameter -NXDOMainRateLimitThreshold
Example:
set dns parameter -NXDOMainRateLimitThreshold 1000
NXDOMainRateLimitThreshold:When this parameter is set to a positive integer value, responses are served from the cache until this threshold (in seconds) is reached. Once the threshold exceeds, the requests are dropped. The threshold configured is per packet engine.
Rate limiting negative response served by the cache by using the GUI
- Navigate toTraffic Management > DNSand clickChange DNS Settings.
- In theConfigure DNS parameterspage, in theNXDOMAIN Rate Limit Thresholdfield, enter the threshold value until which the responses must be served from the cache.
Note:The value in theNXDOMAIN Threshold Crosseddisplays the number of times the requests are dropped after the threshold is reached.
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