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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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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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Configuring Application Access Controls
Application access controls, also known as management access controls, form a unified mechanism for managing user authentication and implementing rules that determine user access to applications and data. You can configure SNIPs to provide access for management applications. Management access for the NSIP is enabled by default and cannot be disabled. You can, however, control it by using ACLs.
For information about using ACLs, see Access Control Lists (ACLs).
The NetScaler appliance does not support management access to VIPs.
The following table provides a summary of the interaction between management access and specific service settings for Telnet.
Management Access | Telnet (State Configured on the NetScaler) | Telnet (Effective State at the IP Level) |
---|---|---|
Enable | Enable | Enable |
Enable | Disable | Disable |
Disable | Enable | Disable |
Disable | Disable | Disable |
The following table provides an overview of the IP addresses used as source IP addresses in outbound traffic.
Application/ IP | NSIP | SNIP | VIP |
---|---|---|---|
ARP | Yes | Yes | No |
Server side traffic | No | Yes | No |
RNAT | No | Yes | Yes |
ICMP PING | Yes | Yes | No |
Dynamic routing | Yes | Yes | Yes |
The following table provides an overview of the applications available on these IP addresses.
Application/ IP | NSIP | SNIP | VIP |
---|---|---|---|
SNMP | Yes | Yes | Yes |
System access | Yes | Yes | No |
You can access and manage the NetScaler by using applications such as Telnet, SSH, GUI, and FTP.
Note: Telnet and FTP are disabled on the NetScaler for security reasons. To enable them, contact the customer support. After the applications are enabled, you can apply the controls at the IP level.
To configure the NetScaler to respond to these applications, you need to enable the specific management applications. If you disable management access for an IP address, existing connections that use the IP address are not terminated, but no new connections can be initiated.
Also, the non-management applications running on the underlying FreeBSD operating system are open to protocol attacks, and these applications do not take advantage of the NetScaler appliance’s attack prevention capabilities.
You can block access to these non-management applications on a SNIP or NSIP. When access is blocked, a user connecting to a NetScaler by using the SNIP or NSIP is not be able to access the non-management applications running on the underlying operating system.
To configure management access for an IP address by using the NetScaler command line:
At the command prompt, type:
set ns ip <IPAddress> -mgmtAccess <value> -telnet <value> -ftp <value> -gui <value> -ssh <value> -snmp <value> -restrictAccess (ENABLED | DISABLED)
Example:
To enable management access and restrict access for a NetScaler owned IP address:
> set ns ip 192.0.2.20 -mgmtAccess enabled -restrictAccess ENABLED
Done
To disable GUI access for a NSIP or SNIP address:
> set ns ip 192.0.2.10 -gui disabled
Done
To enable management access for an IP address by using the NetScaler GUI:
- Navigate to System > Network > IPs > IPV4s.
- Open an IP address entry, and select the Enable Management Access control to support the listed applications option.
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