Chapter 16. Managing Networks and Traffic

•Account, Security Group. (Add by Account only) To accept only traffic from another security group, enter the CloudPlatform account and name of a security group that has already been defined in that account. To allow traffic between VMs within the security group you are editing now, enter its name (that is, the same name you chose in step 3).

The following example allows inbound HTTP access from anywhere:

5.To add an egress rule, click the Egress Rules tab and fill out the following fields to specify what type of traffic is allowed to be sent out of VM instances in this security group. If no egress rules are specified, then all traffic will be allowed out. Once egress rules are specified, the following types of traffic are allowed out: traffic specified in egress rules; queries to DNS and DHCP servers; and responses to any traffic that has been allowed in through an ingress rule

•Add by CIDR/Account. Indicate whether the destination of the traffic will be defined by IP address (CIDR) or an existing security group in a CloudPlatform account (Account). Choose Account if you want to allow outgoing traffic to all VMs in another security group.

•Protocol. The networking protocol that VMs will use to send outgoing traffic. TCP and UDP are typically used for data exchange and end-user communications. ICMP is typically used to send error messages or network monitoring data.

•Start Port, End Port. (TCP, UDP only) A range of listening ports that are the destination for the outgoing traffic. If you are opening a single port, use the same number in both fields.

•ICMP Type, ICMP Code. (ICMP only) The type of message and error code that will be sent

•CIDR. (Add by CIDR only) To send traffic only to IP addresses within a particular address block, enter a CIDR or a comma-separated list of CIDRs. The CIDR is the base IP address of the destination. For example, 192.168.0.0/22. To allow all CIDRs, set to 0.0.0.0/0.

•Account, Security Group. (Add by Account only) To allow traffic to be sent to another security group, enter the CloudPlatform account and name of a security group that has already been defined in that account. To allow traffic between VMs within the security group you are editing now, enter its name (that is, the same name you chose in step 3).

6.Click Add.

16.7. External Firewalls and Load Balancers

CloudPlatform is capable of replacing its Virtual Router with an external Juniper SRX or Cisco ASA 1000v Cloud Firewall device and an optional external Citrix NetScaler or BigIP F5 load balancer for gateway and load balancing services. In this case, the VMs use the SRX or ASA as their gateway.

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Citrix Systems 4.2 manual External Firewalls and Load Balancers
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4.2 specifications

Citrix Systems, a leading provider of virtualization solutions and cloud computing technologies, released version 4.2 of its popular software, Citrix XenApp, which was previously known as Presentation Server. This version marked a significant evolution in providing users with remote access to applications and desktops, emphasizing simplicity, performance, and security.

One of the standout features of Citrix XenApp 4.2 is its improved application streaming capabilities. This technology allows applications to be delivered to users in real-time, reducing the need for extensive local installations and enhancing the user experience. With application streaming, administrators can efficiently manage applications on a central server while ensuring that users have immediate access to the necessary tools.

Another highlight of this version is the enhanced security measures put in place to protect sensitive data. Citrix XenApp 4.2 includes support for SSL encryption, providing a secure communication channel for data transmitted between the server and clients. This is particularly crucial for businesses that need to comply with strict data protection regulations. Additionally, the integration of endpoint security features ensures that unauthorized access to applications is minimized.

Performance enhancements are also a critical focus in this release. Citrix optimized the delivery of applications over various network conditions, ensuring that users experience minimal latency regardless of their location. This was achieved through the incorporation of SmartAccess and SmartControl technologies, which allow administrators to set policies based on user roles, device types, and network conditions. This level of granularity enables organization-wide security without compromising on usability.

The user experience was further improved with a revamped interface, making it easier for end-users to access their applications and data. Simplified menus, clear navigation paths, and the ability to customize user settings contributed to a more efficient workflow, allowing users to focus on their tasks rather than struggling with the software.

Finally, Citrix XenApp 4.2 was designed to be highly scalable. Organizations of all sizes could deploy this solution to deliver applications efficiently, adapting to their specific needs as their user base grows or changes. This flexibility is crucial for businesses looking to future-proof their IT investments while maintaining optimal performance.

In summary, Citrix XenApp 4.2 stands out with its enhanced application streaming, robust security features, improved performance under varying conditions, user-friendly interface, and scalability, making it an ideal choice for organizations seeking to leverage virtualization for remote access to applications and desktops.
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