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Getting Started with NetScaler
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Solutions for Telecom Service Providers
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Points to Consider before Configuring LSN
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Overriding LSN configuration with Load Balancing Configuration
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Load Balance Control-Plane Traffic that is based on Diameter, SIP, and SMPP Protocols
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Provide Subscriber Load Distribution Using GSLB Across Core-Networks of a Telecom Service Provider
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Authentication, authorization, and auditing application traffic
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Basic components of authentication, authorization, and auditing configuration
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Web proxy support for outbound calls to IDP or third party endpoints
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Web Application Firewall protection for VPN virtual servers and authentication virtual servers
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On-premises NetScaler Gateway as an identity provider to Citrix Cloud™
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Authentication, authorization, and auditing configuration for commonly used protocols
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Troubleshoot authentication and authorization related issues
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Troubleshoot authentication, authorization and auditing issues
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Configure EULA as an authentication factor in NetScaler nFactor system
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Configure periodic Endpoint Analysis scan as a factor in nFactor authentication
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Configure post-authentication Endpoint Analysis scan as a factor in NetScaler nFactor authentication
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Configure pre-authentication Endpoint Analysis scan as a factor in nFactor authentication
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Configure pre-auth and post-auth EPA scan as a factor in nFactor authentication
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Configure prefill user name from certificate in NetScaler nFactor authentication
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Configure protected user as an authentication factor in NetScaler nFactor authentication
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Localize error messages generated by NetScaler nFactor system
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Configure NetScaler Gateway preauthentication EPA scan for the domain check
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Configure DNS resource records
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Configure NetScaler as a non-validating security aware stub-resolver
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Jumbo frames support for DNS to handle responses of large sizes
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Caching of EDNS0 client subnet data when the NetScaler appliance is in proxy mode
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Use case - configure the automatic DNSSEC key management feature
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Use Case - configure the automatic DNSSEC key management on GSLB deployment
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Source IP address whitelisting for GSLB communication channels
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Use case: Deployment of domain name based autoscale service group
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Use case: Deployment of IP address based autoscale service group
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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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Retrieve location details from user IP address using geolocation database
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Use source IP address of the client when connecting to the server
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Use client source IP address for backend communication in a v4-v6 load balancing configuration
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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 12: Configure Citrix Virtual Desktops for load balancing
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Use case 13: Configure Citrix Virtual Apps and Desktops for load balancing
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Use case 14: ShareFile wizard for load balancing Citrix ShareFile
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Use case 15: Configure layer 4 load balancing on the NetScaler appliance
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Support for hybrid Post Quantum cryptography on the frontend
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Create a certificate signing request and use SSL certificates on a NetScaler appliance
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Configure SSL acceleration with HTTP on the front end and SSL on the back end
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Export certificates used on a NetScaler appliance as PFX file
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Configure SSL monitoring when client authentication is enabled on the back-end service
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Configure SSL action to forward client traffic if a cipher is not supported on the ADC
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Configure synchronization of files in a high availability setup
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Authentication and authorization for System Users
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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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Points to Consider before Configuring LSN
Consider the following points before configuring LSN on a NetScaler appliance:
- Make sure that you understand the different components of Large Scale NAT, described in RFCs 6888, 5382, 5508, and 4787.
- Endpoint independent mapping (EIM) and endpoint independent filtering (EIF) are disabled by default. These options must be enabled for proper functioning of VoIP and peer-to-peer (P2P) applications.
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Logging LSN: Following are the consideration points for logging LSN information:
- Citrix recommends logging the LSN information on external log servers instead of on the NetScaler appliance. Logging on external servers facilitates optimal performance when the appliance creates large numbers of LSN log entries (in order of millions).
- Citrix® recomends using SYSLOG over TCP, or NSLOG. By default SYSLOG uses UDP, and NSLOG uses only TCP to transfer log information to the log servers. TCP is more reliable than UDP for transferring complete data.
- The following limitations apply to SYSLOG over TCP:
- The Syslog over TCP solution does not provide authentication, integrity check, and privacy.
- The NetScaler appliance relies on the TCP protocol to provide confirmation of SYSLOG message delivery to external log servers.
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High Availability: Following are the consideration points for high availability of NetScaler appliances for LSN:
- Citrix recommends configuring the LSN feature in a high availability deployment of two NetScaler appliances for uninterrupted and seamless operation of all LSN sessions.
- In a high availability deployment, Citrix recommends:
- Setting the SYNC VLAN parameter for dedicating a VLAN for all HA related communication.
- Synchronizing the symmetric RSS key of the primary node to the secondary node for stateful synchronization of a large number of LSN mappings and sessions.
- Binding the subnet of LSN IP addresses to a VLAN to avoid flooding of GARP broadcasts on all VLANs after a failover.
- In a high availability deployment of NetScaler appliances, ALG-related sessions are not mirrored to the secondary appliance.
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Application Layer Gateways (ALGs): Following are the consideration points related for ALGs on a NetScaler appliance:
- The following are not supported for SIP ALG:
- Multicast IP addresses
- Encrypted SDP
- SIP messages over TLS
- FQDN translation in SIP messages
- Authentication of SIP messages
- Traffic domains, admin partitions, andNetScaler clusters.
- SIP messages with multipart bodies.
- The following are not supported for RTSP ALG:
- Multicast RTSP sessions
- RTSP session over UDP
- NetScaler traffic domains, admin partitions, andNetScaler clusters
- The NetScaler appliance does not support ALG for the IPSec protocol.
- The following are not supported for SIP ALG:
- If you disable the LSN feature when some LSN sessions exist on the NetScaler appliance, these sessions continue to exist for the duration of the configured timeout interval.
- LSN takes precedence over RNAT. If a packet from a specified LSN subscriber also matches a RNAT rule, the packet is translated according to the LSN configuration.
- Forwarding of packets related only to the LSN sessions is based on the NetScaler appliance’s routing table.
- Unlike with subnet IP addresses, selection of an LSN NAT IP address for a subscriber’s connection is not based on the routing entry for the destination IP address.
- For inbound packets, static LSN mappings take precedence over dynamic LSN mappings.
- For outbound packets, LSN application profiles take precedence over static mapping.
- When a large number of LSN sessions (> 1 million) exist on the NetScaler appliance, Citrix recommends displaying selected LSN sessions instead of all of them. In the command line interface or the configuration utility, use the selection parameters for showing LSN session operation.
- To reduce the amount of active memory allocated to the LSN feature, you must warm restart the NetScaler appliance after changing the configured-memory setting. Without a warm restart, you can only increase the amount of active memory.
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