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Getting Started with Citrix NetScaler
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Deploy a Citrix NetScaler VPX instance
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Install a Citrix NetScaler VPX instance on Microsoft Hyper-V servers
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Install a NetScaler VPX instance on Linux-KVM platform
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Prerequisites for Installing NetScaler VPX Virtual Appliances on Linux-KVM Platform
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Provisioning the NetScaler Virtual Appliance by using OpenStack
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Provisioning the NetScaler Virtual Appliance by using the Virtual Machine Manager
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Configuring NetScaler Virtual Appliances to Use SR-IOV Network Interface
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Configuring NetScaler Virtual Appliances to use PCI Passthrough Network Interface
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Provisioning the NetScaler Virtual Appliance by using the virsh Program
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Deploying NetScaler VPX Instances on AWS
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Upgrade and downgrade a NetScaler appliance
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Configure DNS resource records
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Configure negative caching of DNS records
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Overriding Static Proximity Behavior by Configuring Preferred Locations
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Example of a Complete Parent-Child Configuration Using the Metrics Exchange Protocol
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Configuring Global Server Load Balancing for DNS Queries with NAPTR records
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Using the EDNS0 Client Subnet Option for Global Server Load Balancing
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Persistence and persistent connections
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Advanced load balancing settings
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Gradually stepping up the load on a new service with virtual server–level slow start
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Protect applications on protected servers against traffic surges
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Use source IP address of the client when connecting to the server
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Set a limit on number of requests per connection to the server
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Configure automatic state transition based on percentage health of bound services
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Use case 2: Configure rule based persistence based on a name-value pair in a TCP byte stream
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Use case 3: Configure load balancing in direct server return mode
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Use case 6: Configure load balancing in DSR mode for IPv6 networks by using the TOS field
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Use case 7: Configure load balancing in DSR mode by using IP Over IP
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Use case 10: Load balancing of intrusion detection system servers
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Use case 11: Isolating network traffic using listen policies
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Use case 14: ShareFile wizard for load balancing Citrix ShareFile
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Configuring a CloudBridge Connector Tunnel between two Datacenters
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Configuring CloudBridge Connector between Datacenter and AWS Cloud
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Configuring a CloudBridge Connector Tunnel Between a Datacenter and Azure Cloud
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Configuring CloudBridge Connector Tunnel between Datacenter and SoftLayer Enterprise Cloud
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Configuring a CloudBridge Connector Tunnel Between a NetScaler Appliance and Cisco IOS Device
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CloudBridge Connector Tunnel Diagnostics and Troubleshooting
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Configure negative caching of DNS records
The NetScaler 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—If a negative response is present in the local cache, the NetScaler returns an error message (NXDOMAIN). If the response is not in the local cache, the query is forwarded to the server, and the server returns an NXDOMAIN error to the NetScaler appliance. The appliance caches the response locally, then returns the error message to the client.
- NODATA error message—If the domain name in query is valid but records of the given type are not available, the appliance sends a NODATA error message.
When negative caching is enabled, the appliance caches the negative response from the DNS server and serves the future requests from the cache only. This helps speed up responses to queries and also to reduce the DNS traffic. Negative caching can be used in all deployments, that is, when a NetScaler appliance is serving as a proxy, as an end resolver, or as a forwarder.
You can enable or disable negative caching using 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 <dnsProfileName> [-cacheRecords ( ENABLED | DISABLED )] [-cacheNegativeResponses (ENABLED | DISABLED )]
- show dns profile [<dnsProfileName>]
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:
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Configure the DNS profile.
add dns profile <dnsProfileName> [-cacheRecords ( ENABLED | DISABLED )] [-cacheNegativeResponses (ENABLED | DISABLED )]
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Bind the DNS profile to the service or virtual server.
To bind the DNS profile to the service:
set service <name> [-dnsProfileName <string>]
Example:
>set service service1 -dnsProfileName dns_profile1
Done
To bind the DNS profile to the virtual server:
set lb vserver <name> [-dnsProfileName <string>]
Example:
>set lb vserver lbvserver1 -dnsProfileName dns_profile1
Done
Specify service or virtual server level DNS parameters by using the GUI
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Configure the HTTP profile.
Navigate to System > Profiles> DNS Profile, and create the DNS profile.
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Bind the HTTP profile to the service or virtual server.
Navigate to Traffic Management > Load Balancing> Services/Virtual Servers, and create the DNS profile, which should be bound to the service/virtual server.
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