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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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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21 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
57 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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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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0answers
13 views

Windows 7 routing with single NIC [migrated]

I have a PC with single NIC running windows 7. This PC is a member of 180.x.x.0/24 network and is internet accessible. Now, my brother brought another PC with single NIC. I want to make it also ...
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4answers
60 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
60 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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0answers
46 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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25 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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2answers
159 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
56 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
7k views

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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3answers
2k views

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
86 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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0answers
173 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
108 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
261 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
66 views

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
115 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
135 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
1k 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
174 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
139 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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30 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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104 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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2answers
94 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
63 views

Put NIC under heavy load [closed]

I think I've got a faulty NIC so I want to put it under heavy but controlled load to see if and when it dies. How can I generate such a load? The NIC is in a Hyper-V host with Windows and Linux ...
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2answers
128 views

XP box with 3 NICs on Server 2003 Domain

I have assigned all three NICs IP addresses that are outside the DHCP pool. I have 2 NICs are connected to 1 switch and the 3rd to my second switch. I want to assign one of the two NICs on the 1st ...
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90 views

Flashing eeprom Intel I340-T4 NIC (IBM OEM)

Trying to get teaming working on a IBM OEM I340-T4 NIC in Windows 8.1 Pro. Windows won't let me use NIC teaming since it uses the default microsoft-driver for the I340-T4 and I'm unable to install ...
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2answers
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Netsh Dump missing DNS settings

I'm trying to figure out why "netsh dump" produces different scripts on 2003 versus 2008. In output below, I've used "netsh interface ip dump" to keep the length of this post reasonable. I've searched ...
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1answer
192 views

Forcing Remote Desktop to listen on an adapter on Server Core

I appear to have the problem described here: "After cloning and syspreping [...] VMs running Windows [...], I was not able to connect to the cloned servers by Remote Desktop. After troubleshooting ...
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244 views

Missing NICs in a HP ProLiant DL380 G6 running RHEL 5.5 64-bit

I have 2 twin boxes HP ProLiant DL3680 G6 running RHEL 5.5 64-bit. In one of them, two network interfaces (eth2 and eth7) are missing, i.e., they are not available: # ifconfig eth2 eth2: error ...
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0answers
187 views

Cannot browse HTTP to a load balanced VIP from w2k8 boxes, but can get to it from w2k3

I have a strange problem and am looking for suggestions. The environment: several VLANs on the same switch, that all talk to each other via the ASA using hairpin routing: VLAN 500 - Windows 2003 ...
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1answer
457 views

NIC Bonding/balance-rr with Dell PowerConnect 5324

I'm trying to get NIC bonding to work with balance-rr so that three NIC ports are combined, so that instead of getting 1 Gbps we get 3 Gbps. We are doing this on two servers connected to the same ...
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1answer
240 views

Bonding more than 2 nics causes connection drops

I'm running CentOS 6.5. I have 3 servers with quad 1Gb nics. I'm using bonding mode 6 (tried 0 as well) running through a cisco 4948 switch. When only two network cables are attached, no issues. If ...
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1answer
42 views

IC socket on network cards?

I have been looking at network cards and I have noticed a few of them have this mysterious port on them that looks like an IC socket. I was wondering what this is used for and if it is of any ...
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3answers
2k views

Finding NIC firmware version

I need to find out the firmware version of the NIC(s) on on IBM Windows Server 2008 using CMD, Powershell or by any other means.I also should note that I can't reboot the server to go to bios or use ...
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2answers
2k views

CentOS not detecting Intel 10G (ixgbe) interface

I have a server with CentOS 6.5 installed with 2x 1Gbps Ethernet Cards, I have added a new interface (Intel(R) 10 Gigabit PCI Express Network) but the problem. is the system is not detecting the ...
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2answers
588 views

Are transceivers hot swappable?

Are transceivers in general hot swappable, and if not, how do I find out if these are? Using these adapters 665243-B21, HP Ethernet 10Gb 2-port 560FLR-SFP+ 665249-B21, HP Ethernet 10Gb 2-port ...
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55 views

AR8151 eth0 heavy trouble

First I had really bad issue with network speed. There I got this good article: http://mindmapapp.blogspot.com/2012/01/use-atheros-ar8151-ethernet-card-on.html But now I have really crazy things ...
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1answer
734 views

Increase Network Bandwidth on Windows Server 2008 R2

I am looking after this network with around 40 clients on one Windows 2008 R2 server. These clients are connected to server via two gigabit switches (24-port dumb switches). Over the next few months ...
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4k 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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4answers
146 views

How to disable NIC transmitter or receiver in Linux

Is it possible to disable either the tx or the rx in a NIC? I am setting up a network monitoring machine and I would like to be sure that no packet will be introduced by this machine at the network. ...
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What happen when I assign 2 IP on one NIC? [closed]

What happen when I assign 2 IP on one NIC? e.g. I have one physical NIC (eth0) and I assign on this interface 2 IPs from different network. e.g. auto eth0 iface eth0 inet static address ...
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1answer
6k views

What else does “netsh int ip reset” do?

According to this KB article when you run the "netsh int ip reset" command, all it does is to reset the content of two registry keys: SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\ ...
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Is it possible to produce an unfair ethernet NIC?

The ethernet MAC protocol is based on CSMA/CD, which defines an algorithm for fair collision handling: If the NIC detects a collision, it sends a jam signal and enters binary exponential backoff: ...
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1answer
185 views

bnx2 keep dropping packets

as mention, my Centos server nic keep dropping packet from time to time, (on-board Broadcom NetXtreme II) it drop packet on eth0 RX: RX packets:4343890 errors:0 dropped:5705 overruns:0 frame:0 I ...
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1answer
67 views

NIC beginner questions [closed]

Hi I wish to learn more about NICs. And I would really appreciate any answers or resources you could point me to! We have a small cluster at work, and I'm thinking about getting 2 to learn with at ...