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Network operating systems can be embedded in a router or hardware firewall that operates the functions in the physical layer (layer 1).
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hv_netvsc(4) [freebsd man page]

HYPER-V(4)						   BSD Kernel Interfaces Manual 						HYPER-V(4)

NAME
hv_netvsc -- Hyper-V Network Virtual Service Consumer SYNOPSIS
To compile this driver into the kernel, place the following lines in the system kernel configuration file: device hyperv DESCRIPTION
The hv_netvsc driver implements the virtual network device for FreeBSD guest partitions running on Hyper-V. FreeBSD guest partitions running on Hyper-V do not have direct access to network devices attached to the Hyper-V server. Although a FreeBSD guest can access network devices using Hyper-V's full emulation mode, the performance in this mode tends to be unsatisfactory. To counter the above issues, the hv_netvsc driver implements a network Virtual Service Consumer (VSC) that relays network requests from the guest partition to the network Virtual Service Provider (VSP) hosted in the root partition using the high performance data exchange infra- structure provided by hv_vmbus(4) driver. The VSP in the root partition then forwards the network related requests to the physical network card. SEE ALSO
hv_ata_pci_disengage(4), hv_storvsc(4), hv_utils(4), hv_vmbus(4) HISTORY
Support for hv_netvsc first appeared in FreeBSD 10.0. The driver was developed through a joint effort between Citrix Incorporated, Microsoft Corporation, and Network Appliance Incorporated. AUTHORS
FreeBSD support for hv_netvsc was first added by Microsoft BSD Integration Services Team <bsdic@microsoft.com>. BSD
September 10, 2013 BSD

Check Out this Related Man Page

HYPER-V(4)						   BSD Kernel Interfaces Manual 						HYPER-V(4)

NAME
hv_kvp -- Hyper-V Key Value Pair Driver SYNOPSIS
To compile this driver into the kernel, place the following lines in the system kernel configuration file: device hyperv DESCRIPTION
The hv_kvp driver provides the ability to store, retrieve, modify and delete key value pairs for FreeBSD guest partitions running on Hyper-V. Hyper-V allows administrators to store custom metadata in the form of key value pairs inside the FreeBSD guest partition. Administrators can use Windows Powershell scripts to add, read, modify and delete such key value pairs. The driver is bare bones and merely forwards requests to its counterpart user mode daemon, hv_kvp_daemon(8). The daemon maintains pools of key value pairs and does the actual metadata management. The same driver and daemon combination are also used to set and get IP addresses from a FreeBSD guest. The set functionality is particularly useful when the FreeBSD guest is assigned a static IP address and is failed over from one Hyper-V host to another. After failover, Hyper-V uses the set IP functionality to automatically update the FreeBSD guest's IP address to its original static value. On the other hand, the get IP functionality is used to update the guest IP address in the Hyper-V management console window. SEE ALSO
hv_ata_pci_disengage(4), hv_netvsc(4), hv_storvsc(4), hv_utils(4), hv_vmbus(4), hv_kvp_daemon(8) HISTORY
Support for hv_kvp first appeared in FreeBSD 10.0. The driver was developed through a joint effort between Citrix Incorporated, Microsoft Corporation and Network Appliance Incorporated. AUTHORS
FreeBSD support for hv_kvp was first added by Microsoft BSD Integration Services Team <bsdic@microsoft.com>. BSD
September 10, 2013 BSD

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