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Getting Started with NetScaler
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Solutions for Telecom Service Providers
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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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Application Layer Gateway for PPTP Protocol
The NetScaler appliance supports Application Layer Gateways (ALGs) for the Point-to-Point Tunneling Protocol (PPTP).
PPTP is a network protocol that enables secure transfer of data from a remote client to an enterprise server by creating a tunnel across TCP/IP-based data networks. PPTP encapsulates PPP packets into IP packets for transmission over the Internet. PPTP establishes a tunnel for each communicating PPTP network server (PNS)-PPTP Access Concentrator (PAC) pair. After the tunnel is set up, enhanced generic routing encapsulation (GRE) is used to exchange PPP packets. A call ID in the GRE header indicates the session to which a particular PPP packet belongs.
The NetScaler appliance recognizes PPTP packets that arrive on the default TCP port, 1723. The appliance parses PPTP control packets, translates the call ID, and assigns a NAT IP address. For two-way data communication between the client and server, the NetScaler appliance creates an LSN session entry based on the server call ID, and an LSN session based on the client call ID. The appliance then parses the GRE data packets and translates call IDs on the basis of the two LSN session entries.
For PPTP protocol, the NetScaler appliance also includes timeout setting for any idle PPTP LSN sessions. If a PPTP LSN session is idle for a time that exceeds the timeout setting, the NetScaler appliance removes the session.
Limitations:
The following are the limitations of PPTP ALG on a NetScaler appliance:
- PPTP ALG is not supported for hairpin LSN flow.
- PPTP ALG is not supported to work with any RNAT configuration.
- PPTP ALG is not supported in NetScaler clusters.
Configuring PPTP ALG
Configuring PPTP ALG on the NetScaler appliance consist of the following tasks:
- Create an LSN configuration and enable PPTP ALG on it. In an LSN configuration, the LSN group includes the PPTP ALG setting. For instructions on creating an LSN configuration, see Configuration Steps for LSN.
- (Optional) Set the global timeout for idle PPTP LSN sessions.
To enable PPTP ALG for an LSN configuration by using the CLI
At the command prompt, type:
add lsn group <groupname> -clientname <string> [-pptp ( ENABLED | DISABLED )]
show lsn group
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To set the global timeout for idle PPTP LSN sessions by using the CLI
At the command prompt, type:
set appAlgParam -pptpGreIdleTimeout <positive_integer>
show appAlgParam
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Example:
In the following sample LSN configuration, PPTP ALG is enabled for subscribers in the 192.0.2.0/24 network.
Also idle PPTP LSN session timeout is set to 200 secs.
add lsn client LSN-CLIENT-1
Done
bind lsn client LSN-CLIENT-1 -network 192.0.2.0 -netmask 255.255.255.0
Done
add lsn pool LSN-POOL-1
Done
bind lsn pool LSN-POOL-1 203.0.113.3
Done
add lsn group LSN-GROUP-1 -clientname LSN-CLIENT-1 -pptp ENABLED
Done
bind lsn group LSN-GROUP-1 -poolname pool1 LSN-POOL-1
Done
set appAlgParam -pptpGreIdleTimeout 200
Done
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