The Case for Enterprise Ready Virtual Private Clouds

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1 The Case for Enterprise Ready Virtual Private Clouds Timothy Wood, Alexandre Gerber *, K.K. Ramakrishnan *, Jacobus van der Merwe *, and Prashant Shenoy University of Massachusetts Amherst *AT&T Research

2 Cloud Computing Rent computation and storage resources on demand Accessed by multiple enterprise sites Cloud Platform Cloud Platform types: Software as a Service Hotmail, Google Docs Platform as a Service Google App Engine, Microsoft Azure Infrastructure as a Service Amazon EC2, VMware vcloud Enterprise Sites

3 Enterprise Cloud Challenges Existing platforms do not meet the needs of enterprise customers Insufficient security controls Need isolation at server and network level Deployment is difficult Cloud resources are completely separate from local ones Can t make VMs look like part of existing LAN Limited control over network resources Cannot specify network topology or IP addresses Cannot reserve bandwidth or request QoS guarantees for network links

4 Moving to the Cloud Acme wants to move part of its payroll app into the cloud Should be easy, right? Acme LAN Front End Reports Processing Tier Data Store Processing Tier Cloud Platform

5 Problem #1: Transparency Application may have been written for LAN environment Might utilize broadcast or LAN service discovery Must add Internet gateways for apps previously only on LAN Now must communicate via public IPs or configure DNS Acme LAN Front End front.acme.com Data Store data.acme.com GW GW Lack of transparency causes application modifications and infrastructure reconfigurations Cloud Platform Processing proc.cloud.com

6 Problem #2: Security Acme s servers are now accessible from the public internet! Servers formerly on secure LAN now exposed to malicious users Must configure firewall rules to limit access Fine grain rules are difficult to manage in dynamic environments Acme LAN Front End front.acme.com Data Store data.acme.com Lack of secure cloud connections exposes enterprise to threats from both in and out of the cloud Cloud Platform Processing proc.cloud.com Hacker123 hax.cloud.com

7 Problem #3: Flexible Resource Mgmt Benefit of cloud computing: ability to easily adjust resource capacities and add new VMs After a change must deal with transparency and security issues all over again! Current platforms do not support network resource reservation (Bandwidth/QoS guarantees) Acme LAN Front End front.acme.com Data Store data.acme.com Enterprises want control over network resources. Cloud must support dynamic changes +1 Cloud Platform Processing proc.cloud.com Processing #2 proc2.cloud.com

8 Key Observation Existing cloud platforms only cover storage and computation Cloud Platform Disk VM + + Enterprise Sites Enterprise Clouds need control over the network as well

9 Virtual Private Clouds A Virtual Private Cloud is A secure collection of server, storage, and network resources spanning one or more cloud data centers That is seamlessly connected to one or more enterprise sites VM VM Enterprise Sites VM VM Cloud Sites Virtual Private Networks (VPNs) Layer 2 and 3 MPLS based VPNs Created by network provider with no end host configuration Already used by many businesses!

10 For the customer: VPC Benefits Isolates network & compute resources Cloud resources are only accessible through VPN Simplifies deployment since cloud looks same as local resources For the service provider: Provides mechanism for control over resource reservation within provider network Simplifies management of multiple data centers by combining them into large resource pools

11 VPC Challenges & Solutions Existing cloud platforms do not integrate with network service providers Must coordinate with ISP to create VPN endpoints VPN endpoints must be linked to VLANs within the cloud data center VPN endpoints are traditionally static Utilize virtual routers with programmable interfaces to rapidly create and reconfigure routers Use BGP signaling to dynamically adjust VPN topology

12 CloudNet Cloud Manager Allocates computation and storage resources Manages VLAN assignment within cloud network Network Manager Creates and configure VPN endpoints Reserves network resources Network Manager Routers Customer Edge Cloud Manager Provider Edge VPN VPN VLAN VLAN VM VM VM VM

13 WAN Migration Layer 2 VPNs make WAN act like a LAN Can use existing LAN migration techniques to move across WAN

14 WAN Migration Layer 2 VPNs make WAN act like a LAN Customer Site CE Cloud Site 1 PE PE VLAN A B ARP! Layer 2 VPN (VPLS) Router Switch VPN endpoint PE CE VLAN ARP! B Cloud Site 2 Can use existing LAN migration techniques to move across WAN

15 Summary Cloud Computing for enterprises requires: Security Transparency Flexibility CloudNet can help provide these features Defines interface between cloud platform and network provider Uses VPNs for secure, seamless connections Employs virtualization at server, router, and network levels to improve agility and efficiency Future Work Network optimizations to reduce latency of WAN migration Utilize VPLS to simplify deployment of high availability services across WAN

16 Questions?

17 Extra slides

18 WAN Migration LAN migration already supported by Xen, VMware, etc Transparently move a VM between two hosts Useful for load balancing, maintenance, etc Only works on LAN because of need for network reconfiguration Layer 2 VPNs make WAN act like a LAN Lets VPN endpoints across WAN act as a single LAN segment Allows for WAN migration without modifying VM platform! Storage migration still must be handled by other means

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