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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 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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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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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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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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High CPU
Following are some of the functionality and high CPU related debugging issues encoutered and the best practices to follow when working with Web App Firewall:
Check Policy hits, Bindings, Network configuration, Web App Firewall configuration:
- Identify misconfiguration
- Identify vserver that is serving the affected traffic
Inspect logs in the following log files for security violations and recent configuration changes:
/var/log/ns.log/var/nslog/import.log/var/nslog/aslearn.logtail -f /var/log/ns.log | grep APPFW_SIGNATURE_MATCH
Example:
Jun 13 01:11:09 <local0.info> 10.217.31.98 CEF:0|Citrix|NetScaler|NS11.0|APPFW| APPFW_SIGNATURE_MATCH|6|src=10.217.253.62 spt=61141 method=GET request= http://aaron.stratum8.net/FFC/wwwboard/passwd.txt msg=Signature violation rule ID 807: web-cgi /wwwboard/passwd.txt access cn1=140 cn2=841 cs1=pr_ffc cs2=PPE0 cs3=OyTgjbXBqcpBFeENKDlde3OkMQ00001 cs4=ALERT cs5=2015 cs6=web-cgi act=not blocked
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Isolate the traffic that is effected:
- Isolate the profile
- Isolate the security check
- Isolate the URL, virtual server and traffic parameters
Conditional profile level trace helps identify the traffic and violation records:
set appfw profile <profile> -trace ONstart nstrace -mode APPFW -size 0stop nstrace
Note: Ensure that the trace is collected with -size 0 option.
Check appfw, dht, IP reputation activity counters:
nsconmsg -g as_ -g appfwreq_ -g iprep -d current
Monitor window size for resets in connection:
Appfw sets the window size to 9845 when NetScaler resets the connection due to an invalid http message.
Examples:
- Malformed request received - connection reset
- High CPU related issues
- Check data sheets for system limits
- Inspect for cpu usage, appfw, DHT and memory related activity. Monitor appfw sessions
- nsconmsg -g cc_cpu_use -g appfwreq -g as -g dht -g mem_AS_OBJ -g mem_AS_COMPONENT -d current
Monitor memory allocated and freed from Web App Firewall components and objects during the target time period. It helps in isolating the protection leading to high CPU usage.
- Profiler output
- Observe logs
Isolate appfw check leading to high CPU:
- startURLClosure
- Formfiledconsistency
- CSRF
- Cookie protections
- Referer header check
Ascertain that autoupdate of signatures is not leading to high CPU (Disable to confirm).
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