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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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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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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171 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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71 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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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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44 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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2answers
121 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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116 views

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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71 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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103 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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58 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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35 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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1answer
90 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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2answers
467 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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232 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
125 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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1answer
160 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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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
171 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
248 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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1answer
75 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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200 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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181 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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336 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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1answer
141 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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36 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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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: ( ...
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118 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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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
41 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 ...
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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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108 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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146 views

How to know whether network card has failed in Linux?

On a server heavily used for file download, the server stops responding ssh, http and ping request every few hours. It will be back to normal after server restart. The provider technician guesses ...
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1answer
289 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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1answer
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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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164 views

Win 2K8 R2 Server, 2 NICs - internal and external - network configuration

I have a Windows server with 2 NICs, a modem/router, a switch and some client computers. I have been trying to set everything up like so: Internet - external NIC - server - internal NIC - switch - ...
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272 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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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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1answer
185 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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HP ConnectX cards identifying as ConnectX EN

I bought a lot of four HP branded ConnectX card on Ebay. The cards are : HP InfiniBand 4X DDR ConnectX PCI-E Gen2 Dual-Port HCA 483514-B2 My problem is that two out of four cards identify themselves ...
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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
597 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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1answer
81 views

Remove gateway for private network on Server with 2 ethernet ports - Why

I have a server with 2 ethernet ports, use one port (eth0) for the private LAN, and a public IP from ISP is on second port (eth1). I have it working, but I'd like to know the reason why I have to ...
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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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891 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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vagrant fails to bring up additional adapter for centos vm using virtual box provider

this is in continuation of the question asked here about host only adapter on dhcp I upgraded to vagrant 1.6.3 and the updated Vagrantfile to following setting for multiple adapters # add additional ...
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361 views

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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2answers
65 views

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
212 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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76 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 ...