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Top Forums UNIX for Dummies Questions & Answers TCP failed connection attempts from netstat -s Post 302399791 by cache51 on Monday 1st of March 2010 03:06:49 PM
Old 03-01-2010
It is on a Virtual Machine (running on Xen) with RHEL5.2 with PV driver. Other VMs created from the same template do not have similar issue.
The issue was seen on some physical machines also, therefore I believe my case may not be related to VM/Phy issue.
 

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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
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