This content has been machine translated dynamically.
Dieser Inhalt ist eine maschinelle Übersetzung, die dynamisch erstellt wurde. (Haftungsausschluss)
Cet article a été traduit automatiquement de manière dynamique. (Clause de non responsabilité)
Este artículo lo ha traducido una máquina de forma dinámica. (Aviso legal)
이 콘텐츠는 동적으로 기계 번역되었습니다. 책임 부인
Este texto foi traduzido automaticamente. (Aviso legal)
Questo contenuto è stato tradotto dinamicamente con traduzione automatica.(Esclusione di responsabilità))
This article has been machine translated.
Dieser Artikel wurde maschinell übersetzt. (Haftungsausschluss)
Ce article a été traduit automatiquement. (Clause de non responsabilité)
Este artículo ha sido traducido automáticamente. (Aviso legal)
이 기사는 기계 번역되었습니다.책임 부인
Este artigo foi traduzido automaticamente.(Aviso legal)
Questo articolo è stato tradotto automaticamente.(Esclusione di responsabilità))
Web App Firewall support for cluster configurations
Citrix Web App Firewall for striped and partially striped configurations was introduced in Citrix ADC 11.0 version.
A cluster is a group of Citrix ADC appliances configured and managed as a single system. Each appliance in the cluster is called a node. Depending on the number of nodes the configurations are active on, cluster configurations are referred to as striped, partially striped, or spotted configurations. The Web App Firewall is fully supported in all configurations.
The two main advantages of striped and partially striped virtual server support in cluster configurations are the following:
- Session failover support—striped and partially striped virtual server configurations support session failover. The advanced Web App Firewall security features, such as Start URL closure and the Form Field Consistency check, maintain, and use sessions during transaction processing. In a high availability configuration, or in a spotted cluster configuration, when the node that is processing the Web App Firewall traffic fails, all the session information is lost and the user has to re-establish the session. In striped virtual server configurations, user sessions are replicated across multiple nodes. If a node goes down, a node running the replica becomes the owner. Session information is maintained without any visible impact to the user.
- Scalability—Any node in the cluster can process the traffic. Multiple nodes of the cluster can process the incoming requests served by the striped virtual server. This improves the Web App Firewall’s ability to handle multiple simultaneous requests, thereby improving the overall performance.
Security checks and signature protections can be deployed without the need for any additional cluster-specific Web App Firewall configuration. You can do the usual Web App Firewall configuration on the configuration coordinator (CCO) node for propagation to all the nodes.
The session information is replicated across multiple nodes, but not across all the nodes in the striped configuration. Therefore, failover support accommodates a limited number of simultaneous failures. If multiple nodes fail simultaneously, the Web App Firewall might lose the session information if a failure occurs before the session is replicated on another node.
- Web App Firewall offers scalability, high throughput, and session failover support in cluster deployments.
- All Web App Firewall security checks and signature protections are supported in all cluster configurations.
- Character-maps are not yet supported for a cluster. The learning engine recommends Field-Types in learned rules for the Field Format security check.
- Stats and learned rules are aggregated from all the nodes in a cluster.
- Distributed Hash Table (DHT) provides the caching of the session and offers the ability to replicate session information across multiple nodes. When a request comes to the virtual server, the Citrix ADC appliance creates Web App Firewall sessions in the DHT, and can also retrieve the session information from the DHT.
- Clustering is licensed with the Advanced and Premium licenses. This feature is not available with the Standard license.
This Preview product documentation is Citrix Confidential.
You agree to hold this documentation confidential pursuant to the terms of your Citrix Beta/Tech Preview Agreement.
The development, release and timing of any features or functionality described in the Preview documentation remains at our sole discretion and are subject to change without notice or consultation.
The documentation is for informational purposes only and is not a commitment, promise or legal obligation to deliver any material, code or functionality and should not be relied upon in making Citrix product purchase decisions.
If you do not agree, select Do Not Agree to exit.