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Method and System for Creating and Employing a Virtual Gateway in a Virtualized Environment

IP.com Disclosure Number: IPCOM000198691D
Publication Date: 2010-Aug-12
Document File: 1 page(s) / 36K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method and system for creating and employing a virtual gateway in a server situated in a virtualized environment is disclosed. The virtual gateway created and employed in the server forwards traffic from a virtual machine (VM) to another VM without requiring a router even if the VMs are situated in the same server.

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Method and System for Creating and Employing a Virtual Gateway in a Virtualized Environment

Disclosed is a method and system for creating and employing a virtual gateway in a server situated in a virtualized environment.

Figure 1

In accordance with the method and system disclosed herein, a virtual machine (VM) to VM communication is created in a hypervisor/vswitch in fig. 1. Thereafter, whenever a virtual gateway receives a packet that is bound from one VM (for example VM1) situated in a server for another VM (for example VM2) that is also situated in the server but is situated on a separate subnet, the virtual gateway accesses a vswitch forwarding table. After accessing the vswitch forwarding table, the virtual gateway changes a source Media Access Control (MAC) address of VM2 to a gateway MAC and forwards the packet. As a result, the packet routing initiated from VM1 to VM2 inside the server does not require a router.

For example, consider a scenario in which VM1 sends a packet having MAC address as 1 and Virtual Local Area Network (VLAN) ID as 1 on 192.168.1.1/24 to VM2 situated on same server as VM1. Additionally, VM2 is having a MAC address as 2 and VLAN ID as 2 but is configured on a different Internet Protocol (IP) subnet, 192.168.2.1/24. In such scenario, when a virtual gateway intercepts the packet at its end, the virtual gateway drops the VLAN ID of VM2 and changes the MAC address of the VM2 to a default gateway MAC address. Thereafter the virtual gatew...