Abstract: An overlay network refers to a network that is implemented as various different virtual resources on a physical network referred to as an underlay network. Diagnostics are performed on the overlay network by injecting diagnostic packets from a source endpoint targeting a target endpoint. These endpoints can be in the overlay network, on-premises with the other endpoint but in a different overlay network, or off-premises form the other endpoint. The diagnostic packets include a data packet encapsulated with a diagnostic encapsulation header that can be removed by a network element in the underlay network to allow processing of the data packet, and then added back on. The network element maintains trace information that is a record of receipt of the diagnostic packet and operations performed on the diagnostic packet. A tracing service collects and analyzes this trace information from the various network elements.

Abstract: Methods, systems, and devices are described herein for modifying the monitoring of the health of a data center IP endpoint (such as VM) during live migration of the data center IP endpoint from a source host to a destination host. In one example, the described techniques may include receiving an indication that a virtual machine is going to be live migrated from a source host to a destination host. Next, evaluation of health probe responses originating from the virtual machine may be suspended for a time period. The time period may be selected based on the live migration. The evaluation of the probe responses originating from the virtual machine may be resumed upon completion of the time period. In some cases, a health probe status of the virtual machine may be migrated from the source host to the destination host.

Abstract: Methods, systems, and devices are described herein for managing a load balancer bypass between two virtual machines through live migration of at least one of the virtual machines. In one aspect, a load balancer bypass may be established between a source virtual machine associated with a source host and a destination virtual machine associated with a destination host. The source virtual machine identification information, source host identification information, destination virtual machine identification information, and destination host identification information may be associated with an indication of whether the bypass is active, for example, in a bypass data structure. Upon a determination that live migration of at least one of the source virtual machine or the destination virtual machine has been completed to a third host, the bypass data structure may be updated with identification information of the third host to maintain the load balancer bypass after completion of the live migration.

Abstract: Methods, systems, and devices are described herein for modifying the monitoring of the health of a data center IP endpoint (such as VM) during live migration of the data center IP endpoint from a source host to a destination host. In one example, the described techniques may include receiving an indication that a virtual machine is going to be live migrated from a source host to a destination host. Next, evaluation of health probe responses originating from the virtual machine may be suspended for a time period. The time period may be selected based on the live migration. The evaluation of the probe responses originating from the virtual machine may be resumed upon completion of the time period. In some cases, a health probe status of the virtual machine may be migrated from the source host to the destination host.

Abstract: An overlay network refers to a network that is implemented as various different virtual resources on a physical network referred to as an underlay network. Diagnostics are performed on the overlay network by injecting diagnostic packets from a source endpoint targeting a target endpoint. These endpoints can be in the overlay network, on-premises with the other endpoint but in a different overlay network, or off-premises form the other endpoint. The diagnostic packets include a data packet encapsulated with a diagnostic encapsulation header that can be removed by a network element in the underlay network to allow processing of the data packet, and then added back on. The network element maintains trace information that is a record of receipt of the diagnostic packet and operations performed on the diagnostic packet. A tracing service collects and analyzes this trace information from the various network elements.

Abstract: Methods, systems, and devices are described herein for managing a load balancer bypass between two virtual machines through live migration of at least one of the virtual machines. In one aspect, a load balancer bypass may be established between a source virtual machine associated with a source host and a destination virtual machine associated with a destination host. The source virtual machine identification information, source host identification information, destination virtual machine identification information, and destination host identification information may be associated with an indication of whether the bypass is active, for example, in a bypass data structure. Upon a determination that live migration of at least one of the source virtual machine or the destination virtual machine has been completed to a third host, the bypass data structure may be updated with identification information of the third host to maintain the load balancer bypass after completion of the live migration.

Abstract: Methods, systems, and devices are described herein for facilitating live migration of a virtual machine from a source host to a destination host. In one aspect, a method for facilitating live migration may include obtaining connection state information corresponding to a configured communication link of a virtual machine associated with a source host. The method may further include migrating the connection state information to a destination host selected for live migration of the virtual machine. The method may additionally include modifying the connection state information based on the destination host to generate modified connection state information. The virtual machine, after live migration to the destination host, may be configured to maintain the configured communication link using the modified connection state information.

Abstract: Methods, systems, and devices are described herein for modifying the monitoring of the health of a data center IP endpoint (such as VM) during live migration of the data center IP endpoint from a source host to a destination host. In one example, the described techniques may include receiving an indication that a virtual machine is going to be live migrated from a source host to a destination host. Next, evaluation of health probe responses originating from the virtual machine may be suspended for a time period. The time period may be selected based on the live migration. The evaluation of the probe responses originating from the virtual machine may be resumed upon completion of the time period. In some cases, a health probe status of the virtual machine may be migrated from the source host to the destination host.

Abstract: A method for provisioning a suitable operating system environment to a client machine in a client-server architecture including the at least one client machine in communication with a plurality of servers over a network. A pre-execution boot program is executed on powering the client machine, the pre-execution boot program being configured to identify a Dynamic Host Control Protocol (DHCP) server to obtain an Internet Protocol (IP) address for the client machine. Next, the client machine establishes contact with an installation server, which is coupled to the client machine over a network. Thereafter, the client machine receives a first software module from the installation server based on processor type of the client machine. The first software module scans the client machine using to obtain a list of hardware elements on the client machine and the client machine transmits the list of hardware elements on the client machine to the installation server.

Abstract: A method for provisioning a suitable operating system environment to a client machine in a client-server architecture including the at least one client machine in communication with a plurality of servers over a network. A pre-execution boot program is executed on powering the client machine, the pre-execution boot program being configured to identify a Dynamic Host Control Protocol (DHCP) server to obtain an Internet Protocol (IP) address for the client machine. Next, the client machine establishes contact with an installation server, which is coupled to the client machine over a network. Thereafter, the client machine receives a first software module from the installation server based on processor type of the client machine. The first software module scans the client machine using to obtain a list of hardware elements on the client machine and the client machine transmits the list of hardware elements on the client machine to the installation server.