A Network Interface Card is a computer component which connects to a physical network in order to send and receive data.

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“Allow the computer to turn off this device to save power” - Windows vNIC

Here's an interesting one I haven't seen on ServerFault I'd like to "discuss" based on our rule regarding a Good Subjective question. I have a ton of Windows 2008/2012 VMs in my environment running ...
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2answers
978 views

Need to configure 2008 server with 2 NICs on different subnets

I am working on an application that requires a 2008 server to have 2 NICs for security purposes. NIC 1 will be connected to the customer's enterprise network with a static IP and is routable. It ...
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28 views

Make local subnet clients get redirected like public clients, when requesting a redirected outside port on the firewall

I have a server that also functions as a firewall for the 192.168.1.0/24 subnet via iptables. It also double as a VM Server. Both the VM's and the local machines share the subnet. The servers ...
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12 views

Transparent proxy Squid with 1 NIC without virtual interfaces

I'm trying to setup a transparent proxy in an existing LAN. I've seen many tutorials where Squid is being implement as a router in the network, even with 1 NIC, where 2 virtual interfaces are created ...
3
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1answer
45 views

How can I confirm if my vmxnet driver is installed on my CentOS server?

I have an appliance running CentOS 5.x on VMWare ESX. Quite recently I upgraded it to a newer version of CentOS (still in 5.x) and I noticed that the network card wouldn't initialize. If I run ...
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0answers
22 views

What are the advantages NAPI before the IRQ Coalesce?

As known there are two approach to avoid some overheads of hardware interrupts in highload networks, when there are too many hardware interrupts, that switching to them takes too much time. It is very ...
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5answers
6k views

What network loads require NIC polling vs interrupts?

Does anyone have some data or basic calculations that can answer when frame coalescing (NAPI) is required and when a single interrupt per frame is sufficient? My hardware: IBM BladeServer HS22, ...
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1answer
9k views

NAPI vs Adaptive Interrupts

Could anyone please explain how two following technologies are used to mitigate interrupt overhead under high networking load? Adaptive-rx/Adaptive-tx, and NAPI; I would appreciate an answer that ...
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68 views

How best to setup for high traffic due to thin clients

I develop a client/server software system that is designed to display images to the photographer's customers. A LOT of my customers are using thin clients for the viewing stations, the NComputing ...
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1answer
2k views

eth0 NIC Link is Down repeating message in kernel log

I've noticed since few days ago that same repeating kind of messages occurs and I positively can say that nothing was intentionally changed (installed/uninstalled) in that period. here's sample of ...
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1answer
25 views

Should I virtualliy split a multi-port NIC for various virtual machines in Hyper-V?

I have a NIC with 4 ports running on Hyper-V. I would be running two virtual machines one would be a WS2012R2 (DC, DNS, DHCP, FS, RRAS, etc.) and a W7 (basically used with one application that needs ...
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251 views

Disable NIC advanced properties in Windows server 2008/2012

I have some Rackspace VM's and need to disable these advanced NIC properties: Correct TCP/UDP checksum value IPv4 checksum offload Large receive offload Large send offload version 2 TCP checksum ...
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1answer
40 views

Why are eno1 and eno2 in this order?

I've just installed a Fedora 21 Workstation system, and it's reversed the order of eno1 and eno2 from the CentOS 6 system that was on here before. lspci | grep Eth 00:19.0 Ethernet controller: Intel ...
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0answers
18 views

Network Interfaces Cards and rx_short_length_errors and Linux Kernel

My machine (Linux OS) is counting packets with wrong length, it is a huge environment (GW's, Routers, Switches...) , so I would like to understand how NIC's behaving with these packets. -Does NIC's ...
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3answers
5k views

PCIe x8 NIC in PCIe x16 slot

I have a motherboard with only one x16 PCIe slot and no x8 slots. I am buying a NIC with very specific configuration, but it is available for x8 slots only. Can I plug a x8 card in a x16 slot? I have ...
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1answer
61 views

What difference between HP and Intel network adapter, both using an Intel controller?

For example, the network adapter HP NC360T PCI card uses the Intel 82571EB controller. So, what exactly is the difference between an Intel "fully" branded card, and a HP branded card having an Intel ...
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4answers
195 views

Communicating via separate network cards

Assume you have a web server with two network cards (and their associated ports), let's call them A and B. The idea is to connect one port (A) to the internet and the other (B) to some isolated ...
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1answer
3k views

e1000e Reset adapter unexpectedly / Detected Hardware Unit Hang

I have a Dell 1U Server with Intel(R) Xeon(R) CPU L5420 @ 2.50GHz, 8 cores running Ubuntu Server Kernel Version 3.13.0-32-generic on x86_64. It has dual 1000baseT networking cards. I have it set up to ...
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1answer
108 views

assign Second IP in ESXi 5.5 host Centos 6.6

Hello i have just installed CenOSs 6.6 on ESXi 5.5 and I have eth0 working fine. I have internet access and I want to assign a second IP in CentOS. So purchased another ip from oneprovider.com and ...
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3answers
3k views

Why is ethtool not showing me all the properties for a NIC?

CentOS 5.8 | VMWare ESX 5.1 When I run ethtool eth0 I see the following: [root@foo ~]# ethtool eth0 Settings for eth0: Current message level: 0x00000007 (7) Link detected: yes ...
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2answers
1k views

Very odd behavior with a Realtek NIC in ESXi 5

I am experiencing a strange issue in ESXi 5. I just installed a new NIC (RTL8169, which is supported), but ESXi only recognizes it on the first reboot after the installation. So in order: Shutdown ...
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2answers
143 views

Network adapter disappeared

Today I found myself in a strange situation where my Windows Server 2008r2 machine has internet connection while not showing any connections in 'network connections'. It does not show anywhere in ...
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50 views

BroadCom 5720 Multi-Switch Connection failing to achieve full bandwidth

We have following Setup: 2 redundant Dell 2848 Switches, identically configured and connected via 8-Port LAG on Ports 41-48. 2 identically setup Dell R730 with BroadCom 5720. Operating System is ...
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1answer
82 views

Static Route Dual LAN CARD Centos 6

First let me explain the scenario. I have two internet connection (Lease LINE and BroadBand). I have a CENTOS 6 Server which is used for VOIP calling (GOAUTODIAL). Now I want everyone in the LAN to ...
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ubuntu route all client eth0 traffic to openvpn on client tun0

OpenVPN client has 2 physical interfaces: eth0 = 192.168.10.14/24 gw 192.168.10.1 eth1 = 192.168.10.17/24 gw 192.168.10.1 tun0 = 172.160.1.6/24 gw 172.16.1.5 Server is external somewhere listening ...
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80 views

Server nics on two subnets: gateway?

Server is connected two two separate, isolated subnets via two physical nics. Is there any way the server can act as a gateway for the two networks to communicate? To clarify, I don't want any ...
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1answer
134 views

device vs interface vs connection under linux with nmcli [closed]

What are dependencies and relations between device, interface and connection in nmcli cmdline utility under linux? The below questions are asked in context of nmcli and networking in linux: Which ...
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65 views

HP NC364T on CentOS 7

i am trying to install a quad port network card (HP NC364T) into a machine I have running CentOS 7. The issue is that during boot, the OS hard crashes and reboots the machine. This is after all boot ...
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52 views

Does Ubuntu with Linux 3.5 having TX RX ring buffers or BQL

My linux uname -a command outputs: Linux Davinci001 3.5.0-23-generic #35~precise1-Ubuntu SMP Fri Jan 25 17:13:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux So, does NICs with this Ubuntu machine is ...
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3answers
3k views

Why did robocopy cause my Windows 2012 server to hang last night?

I'm in the process of decommissioning an old 2003 server, which acts as a file server, and am just attempting a dry-run of migrating the file repository over to a new Windows Storage Server 2012 box. ...
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787 views

MDT Deployment Issue-Driver not loading (i217-LM on MDT)

I have been testing a replacement imaging system to replace our limited Ghost deployment system for a good portion of the last year. We bought a new batch of machines (HP Workstation Z230) which have ...
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1answer
111 views

Supermicro NICs gone after BIOS update

Just updated the BIOS of two Supermicro 1022G-URFs to R3.5. They've both the mainboard H8DGU-F with two onboard Intel 82576 NICs. One of the two Supermicros doesn't have any visible NICs at all after ...
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7answers
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vSphere NIC Teaming - Any reason for Active/Standby?

We're using ESXi and I'm wondering about the "NIC Teaming" options for our vSwitches. On a particular vSwitch with 2 NICs, is there any GOOD reason for configuring a NIC as Active and the other as ...
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2answers
2k views

How do I rename a NIC: eth2 -> eth1

I've installed a new NIC. It shows up as eth2. I'd like it to be eth1. How I can do this?
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ESXi 5.5 NIC teaming for Load balancing using Cisco Etherchannel

I am using Cisco 3750G stacked switch configured with etherchannel and connected to ESXi Server configured with NIC teaming; Load balancing as router based on IP Hash. Cisco Switch configuration: ( ...
3
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1answer
174 views

How can I stop Azure from randomly replacing network cards on VMs?

Azure seem to have the habit of randomly changing the hardware configuration of virtual machines, without telling anything to the user. This is of course mentioned in the documentation, although ...
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277 views

Cannot set 1G speed on 10G nic using ethtool

I have a linux server with 10G fibre nics: xyz@xyz48:~$ sudo ethtool p1p1 Settings for p1p1: Supported ports: [ FIBRE ] Supported link modes: 10000baseT/Full Supported pause frame use: ...
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1answer
372 views

How to implement a network fault tolerance on a Windows Server 2008 R2, Single Server - Dual NIC? Only Windows Services like DNS, DHCP, File Server

Diagram 1: Server, VIP IP Address, Network connections, Switches and Clients Hello There! We have an IBM x3650 M3, Dual NIC. We have Windows Server 2008 R2. In this Window we will have services ...
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2answers
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Are Add-On 10gb Nics Legit? [closed]

Sorry if this is product specific but I'm not sure where else to ask Are these AddOn nics legitimate 10gbE, or does anyone have any experience with them. There about 1/100th of the price of the ...
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1answer
222 views

3 NICs in VMware ESX 5.5.0 cannot connect to each other [closed]

I have a Vmware ESXi 5.5.0 hypervisor, installed on a desktop pc with 3 physical NICs. The first NIC is connected to the internet (WAN), the 2nd and 3rd NICs have Access Points installed (plugged in) ...
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1answer
337 views

How do I increase the ring parameters for a NIC on a Linux server

I used the ethtool utility to increase the rx and tx values for the NIC on one of our servers. I ran the following command: ethtool -g eth0 Ring parameters for eth0: Pre-set maximums: RX: ...
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2answers
2k views

Multiple NIC arp issue

I'm troubleshooting an issue on Centos 6.4. I have a few systems setting up for greenplum. Each one has two "interconnect" interfaces connecting to an isolated subnet. It is like a cluster ...
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2answers
224 views

Slow local area network speeds

Updated on 2014-10-09 Disclaimer This question is similar to Unexplained slow gigabit network speeds but because the latter is still unanswered after 5 years, and that I think I'm able to add more ...
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1answer
204 views

Ubuntu server - NIC suddenly loses connectivity

I'm scratching my head. I recently configured a server with two identical Intel NICs inside a DMZ. This morning at around 8:05, I successfully SSH'd in through the internal interface (via my LAN-based ...
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183 views

Linux router with multiple gateways and port forwarding

I want to use a Linux VM to act as several routers at once. I have multiple servers hosting different services and dedicated public IP for each of them. Super simplified setup example: Ubuntu ...
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1answer
157 views

Complex DNS resolution on non-connected networks (Ethernet & InfiniBand)

We're having problems with DNS resolution working properly when each server is on two, non-connected networks (an Ethernet and an InfiniBand). An example network can be seen by the basic Visio ...
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37 views

How to identify hosts with bridged adapters

We have an issue with our Windows DHCP server randomly having bad address errors. The current top theory is that there is a host within that pool with bridged network adapters, causing all sorts of ...
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126 views

How to force/fake linux eth0 in 'up' status even without cable connected?

One of my testing script is eth0 status related, when eth0 goes down(cable unplugged), the script exit, and i need to unplug and plug cable many times due to test needs. is there anyway can fake ...
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99 views

How can NIC's remember the DHCP address past power off? [closed]

I have now seen an HP ProLiant DL385 G7 (573088-421) and HP ProLiant DL360p Gen8 both being able to remember the DHCP address for its NIC's even though I had powered off the server, and pulled the ...
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1answer
43 views

Network card with 2 ips, Application can only listen on 1 IP, want other IP routed

I run an ubuntu server. It has 1 NIC with 2 IP address. it looks like this: # The primary network interface auto eth0 iface eth0 inet static address 192.168.1.23 netmask 255.255.255.0 gateway ...