Zentera Systems CoIP Platform
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1 Application Note Zentera Systems CoIP Platform Traffic Isolation Using CoIP Traffic Isolation is Critical to Network Security An important attribute of any network is that it ensures certain types of traffic are isolated from other traffic in the network. Traffic is defined as the information traveling across a network, including both user data and network-related information. Traffic isolation is the process of dividing a network into smaller sections to improve overall network performance. Isolation provides an additional level of security to network traffic. Providing traffic isolation to secure data, especially in multi-tenant situations, such as datacenters and the public cloud, is a security priority. In on-premise networks, physical devices such as network switches and routers are used to segment networks. These devices keep traffic from flowing between network segments by isolating traffic to appropriate sections of the network. However, with the recent widespread shift in network architectures from physical to virtual, as well as the emergence of SDN and the cloud, providing traffic isolation has become difficult and complex. The Zentera CoIP platform provides a set of overlay networking and security tools that enable setup and isolation of networks that span public and private clouds along with enterprise datacenters. With CoIP, traffic can be isolated and secured within a day, without changes to existing security infrastructure. This application note presents a next-generation isolation solution based on CoIP, starting with how isolation is typically done. The next section outlines how CoIP offers isolation, and the closing section shows how to deploy traffic isolation by using CoIP. Conventional Approaches to Network Isolation Network isolation today is done through VLAN and VXLAN. However, these technologies do not allow for cloud technology as they were not created with the cloud in mind.
2 VLAN Traffic Isolation Traffic isolation was originally done via VLAN by virtualizing the bridging table of an L2 switch so that traffic traveling from one VLAN cannot bleed into another VLAN. However, VLAN offers only 4,000 isolated segments. Figure 1 illustrates a typical VLAN deployment. Figure 1: VLAN Traffic Isolation VXLAN Traffic Isolation VXLAN provides traffic isolation in L2 and is a replacement for VLAN. It overcomes the limitations of VLAN by offering 16 million isolated segments that span across L3 network (IP) boundaries. VXLAN is commonly used in datacenters or private clouds for isolation, datacenter extension, and multi-tenancy, but it is difficult for cloud customers to extend or implement in the public cloud. Furthermore, while VXLAN packets are encapsulated, VXLAN does not offer encryption, which is a key security requirement for many customers. Figure 2 illustrates a typical VXLAN deployment. Figure 2: Typical VXLAN Deployment 2 Zentera Systems All Rights Reserved 2Q2017
3 CoIP Provides Traffic Isolation The CoIP platform is an on-demand virtual overlay network that provides deeply integrated defense-indepth capabilities network isolation, network encryption, micro-segmentation, and application whitelisting. The platform is transport and cloud-agnostic, and can be deployed rapidly without interfering with existing infrastructure or security measures. Key Components CoIP consists of the following components: a centralized controller (zcenter) with deployment automation; CoIP LAN and WAN; and endpoint sensors for virtual machines (VMs), containers, and compute endpoints. APIs are provided to integration partners including industry-leading security providers to extend their offerings (e.g., IPS/IDS solutions) to IaaS clouds such as AWS, Azure, and Google Cloud. Figure 3 illustrates a conceptual multicloud CoIP deployment p- Figure 3: Multicloud CoIP Deployment 3 Zentera Systems All Rights Reserved 2Q2017
4 Isolating Traffic Using CoIP CoIP is a non-interfering, multicloud network security solution that leverages underlying network and security infrastructure via a virtual overlay network. In essence, CoIP decouples the application layer from the underlying network layer. In contrast to VLAN and VXLAN, CoIP operates at L5. Virtual Overlay Enclaves CoIP provides traffic isolation through virtual overlay enclaves, which are network groupings that span across multiple datacenters, public clouds, and private clouds. A virtual enclave is a whitelisted virtual network that connects an isolated group of CoIP endpoints. CoIP endpoints can be VMs, physical servers, or containers. Such an enclave is completely segmented from other enclaves and the underlying networks. Additionally, traffic between endpoints can be encrypted end-to-end for enhanced security. Figure 4 illustrates five types of enclaves including IaaS Cloud, On-Prem, Multicloud, On-Prem- Multicloud, and On-Prem-Cloud. Figure 4: Isolated Virtual Overlay Enclave Types Application Tier Isolation CoIP also provides application tier isolation via micro-segmentation and application interlock. Application interlock is an L7 filtering mechanism where only whitelisted (enterprise-specified) applications are permitted to use the CoIP virtual overlay network. Figure 5 illustrates a three-tier application with isolation between the tiers using CoIP. 4 Zentera Systems All Rights Reserved 2Q2017
5 Figure 5: Three-Tier Isolation on the CoIP Network Deploying Traffic Isolation Using CoIP The CoIP controller is designed to manage multicloud deployments. It can be located in the enterprise datacenter or any private or public cloud (Azure, AWS, etc.). As illustrated in Figure 6, the CoIP Controller provides two levels of enclaves for isolation: project isolation and application profile isolation. Deployment Scenario This deployment scenario focuses on project level isolation. The project consists of a CoIP Controller running on an enterprise datacenter, three compute resources in AWS, a resource in the enterprise datacenter, and two applicationlevel enclaves (managed by the CoIP controller), as shown in Figure 7. All compute resources in this example are running Linux CentOS. Figure 6: CoIP Controller manages multiple projects 5 Zentera Systems All Rights Reserved 2Q2017
6 Figure 7: Service Isolation between Enclaves Enclave Configuration Procedure Step Description 1 Create Cloud Project 2 Create and Activate Enclave (Application Profile) 3 Create Cloud Domain/s 4 Create Server Group/s 5 Create Virtual Networks to Connect Server Groups Enclave configuration via the CoIP controller. Step 1: Create Cloud Project 6 Zentera Systems All Rights Reserved 2Q2017
7 Step 2: Create and activate Enclave (Application Profile) Step 3: Create Cloud Domain/s Step 4: Create Server Group/s 7 Zentera Systems All Rights Reserved 2Q2017
8 Step 5: Create Virtual Networks to connect Server Groups Service Isolation Verification Each enclave in Figure 7 contains two server groups each hosting one virtual machine. Note overlapping CoIP addresses. Enclave 1 VMs can communicate over the CoIP network. Enclave 2 VMs can communicate over CoIP Network. Enclave 1 VM (aws2) connects to The following series of screenshots show service isolation as packets (from aws2) hitting aws1 (same enclave) but not aws3 (uses same CoIP as aws1 but resides in different enclave). aws2 aws1 aws3 8 Zentera Systems All Rights Reserved 2Q2017
9 This verifies that CoIP service isolation prohibits compute resources from communicating across enclaves. In contrast to VXLAN, CoIP provides encryption and can be easily deployed in multicloud environments including public clouds. 9 Zentera Systems All Rights Reserved 2Q2017
Security Considerations for Cloud Readiness
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