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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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Monitor certificate status with OCSP
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Support for Gemalto SafeNet Network hardware security module
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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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Monitor certificate status with OCSP
Online Certificate Status Protocol (OCSP) is an Internet protocol that is used to determine the status of a client SSL certificate. NetScaler appliances support OCSP as defined in RFC 2560. OCSP offers significant advantages over certificate revocation lists (CRLs) in terms of timely information. Up-to-date revocation status of a client certificate is especially useful in transactions involving large sums of money and high-value stock trades. It also uses fewer system and network resources. NetScaler implementation of OCSP includes request batching and response caching.
OCSP implementation
OCSP validation on a NetScaler appliance begins when the appliance receives a client certificate during an SSL handshake. To validate the certificate, the appliance creates an OCSP request and forwards it to the OCSP responder. To do so, the appliance uses a locally configured URL. The transaction is in a suspended state until the appliance evaluates the response from the server and determines whether to allow the transaction or reject it. If the response from the server is delayed beyond the configured time and no other responders are configured, the appliance will allow the transaction or display an error, depending on whether the OCSP check was set to optional or mandatory, respectively.
The appliance supports batching of OCSP requests and caching of OCSP responses to reduce the load on the OCSP responder and provide faster responses.
OCSP request batching
Each time the appliance receives a client certificate, it sends a request to the OCSP responder. To help avoid overloading the OCSP responder, the appliance can query the status of more than one client certificate in the same request. For this to work efficiently, a timeout needs to be defined so that processing of a single certificate is not inordinately delayed while waiting to form a batch.
OCSP response caching
Caching of responses received from the OCSP responder enables faster responses to the clients and reduces the load on the OCSP responder. Upon receiving the revocation status of a client certificate from the OCSP responder, the appliance caches the response locally for a predefined length of time. When a client certificate is received during an SSL handshake, the appliance first checks its local cache for an entry for this certificate. If an entry is found that is still valid (within the cache timeout limit), it is evaluated and the client certificate is accepted or rejected. If a certificate is not found, the appliance sends a request to the OCSP responder and stores the response in its local cache for a configured length of time.
OCSP responder configuration
Configuring OCSP involves adding an OCSP responder, binding the OCSP responder to a certification authority (CA) certificate, and binding the certificate to an SSL virtual server. If you need to bind a different certificate to an OCSP responder that has already been configured, you need to first unbind the responder and then bind the responder to a different certificate.
Add an OCSP responder by using the CLI
At the command prompt, type the following commands to configure OCSP and verify the configuration:
add ssl ocspResponder <name> -url <URL> [-cache ( ENABLED | DISABLED )[-cacheTimeout <positive_integer>]] [ -batchingDepth <positive_integer>][-batchingDelay <positive_integer>] [-resptimeout <positive_integer>] [-responderCert <string> | -trustResponder] [-producedAtTimeSkew <positive_integer>][-signingCert <string>][-useNonce ( YES | NO )][ -insertClientCert( YES | NO )]
bind ssl certKey [<certkeyName>] [-ocspResponder <string>] [-priority <positive_integer>]
bind ssl vserver <vServerName>@ (-certkeyName <string> ( CA [-ocspCheck ( Mandatory | Optional )]))
show ssl ocspResponder [<name>]
Example:
add ssl ocspResponder ocsp_responder1 -url "http:// www.myCA.org:80/ocsp/" -cache ENABLED -cacheTimeout 30 -batchingDepth 8 -batchingDelay 100 -resptimeout 100 -responderCert responder_cert -producedAtTimeSkew 300 -signingCert sign_cert -insertClientCert YES
bind ssl certKey ca_cert -ocspResponder ocsp_responder1 -priority 1
bind ssl vserver vs1 -certkeyName ca_cert -CA -ocspCheck Mandatory
sh ocspResponder ocsp_responder1
1)Name: ocsp_responder1
URL: http://www.myCA.org:80/ocsp/, IP: 192.128.22.22
Caching: Enabled Timeout: 30 minutes
Batching: 8 Timeout: 100 mS
HTTP Request Timeout: 100mS
Request Signing Certificate: sign_cert
Response Verification: Full, Certificate: responder_cert
ProducedAt Time Skew: 300 s
Nonce Extension: Enabled
Client Cert Insertion: Enabled
Done
show certkey ca_cert
Name: ca_cert Status: Valid, Days to expiration:8907
Version: 3
…
1) VServer name: vs1 CA Certificate
1) OCSP Responder name: ocsp_responder1 Priority: 1
Done
sh ssl vs vs1
Advanced SSL configuration for VServer vs1:
DH: DISABLED
…
1) CertKey Name: ca_cert CA Certificate OCSPCheck: Mandatory
1) Cipher Name: DEFAULT
Description: Predefined Cipher Alias
Done
Modify an OCSP responder by using the CLI
You cannot modify the responder name. All other parameters can be changed using the set ssl ocspResponder command.
At the command prompt, type the following commands to set the parameters and verify the configuration:
set ssl ocspResponder <name> [-url <URL>] [-cache ( ENABLED | DISABLED)] [-cacheTimeout <positive_integer>] [-batchingDepth <positive_integer>] [-batchingDelay <positive_integer>] [-resptimeout <positive_integer>] [ -responderCert <string> | -trustResponder][-producedAtTimeSkew <positive_integer>][-signingCert <string>] [-useNonce ( YES | NO )]
unbind ssl certKey [<certkeyName>] [-ocspResponder <string>]
bind ssl certKey [<certkeyName>] [-ocspResponder <string>] [-priority <positive_integer>]
show ssl ocspResponder [<name>]
Configure an OCSP responder by using the GUI
- Navigate to Traffic Management > SSL > OCSP Responder, and configure an OCSP responder.
- Navigate to Traffic Management > SSL > Certificates, select a certificate, and in the Action list, select OCSP Bindings. Bind an OCSP responder.
- Navigate to Traffic Management > Load Balancing > Virtual Servers, open a virtual server, and click in the Certificates section to bind a CA certificate.
- Optionally, select select OCSP Mandatory.
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