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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Windows 7 sending all packets to one nic

I have windows 7 with two nics, one default gateway set on nic1, and no default gateway on nic2. Nics are on different subnets. Nic1 is on 192.168.1.0/24 subnet, and nic2 is on 10.60.194.0/28 network. ...
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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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294 views

Using 2 NIC in ESXi 4.1

We are planning to move all our physical server into 2 ESXi box. Currently each of the server has 2 NIC. One NIC is used as public interface which has public IP, and another NIC has private IP. All ...
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KVM NIC passthrough “device already in use”

I have a server with 2 NICs 01:00.0 Ethernet controller: Intel Corporation Ethernet Controller 10-Gigabit X540-AT2 (rev 01) 01:00.1 Ethernet controller: Intel Corporation Ethernet Controller ...
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Routing traffic using IP tables for two NICs [closed]

I have two NICs (eth0 and eth1). I want to block all traffic (Incoming/outgoing) on eth0 except for port 25 and 993, and allow all other traffic (Incoming/outgoing) on eth1. What's the easiest IP ...
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iSCSI / SAN / Cluster / multiple NICs failover

Got a problem with NIC failover with iSCSI. Setup: A server with 3 NICs. One NIC is local network, other 2 are SAN. Using Microsoft iSCSI Initiator. A managed network switch. A QNAP SAN, connected ...
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37 views

Domain PC freezes, the NIC blocks all L3 connectivity on that switch

I manage a domain with 80 PC and for over a year I have a big unsolved problem. I redistribute windows update using a WSUS on domain. The PCs after the user finish working and leave, start installing ...
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106 views

How to setup 3 networks on a 2 NICs Ubuntu box?

I need to configure 3 networks on my Ubuntu machine (OpenStack Network node) The /etc/network/interfaces I have is: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet ...
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multiple physical interfaces with IPs on the same subnet

I have a linux box with 9 NICs on it, and I want eight of them to have unique addresses on the same subnet, e.g.: ifconfig eth1 192.168.123.1 netmask 255.255.0.0 ifconfig eth2 192.168.123.2 netmask ...
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Why does a ping flood wake up a PC, while a single ping does not? [migrated]

I just noticed that when you flood-ping a PC that is in sleep-mode, it will wake it up while a single ping or multple pings per 1 sec does not wake it up. Wake up on lan/wan is enabled. What is the ...
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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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63 views

Adding a virtual NIC to a 2008R2 server makes internet unreachable, why?

I currently have a Windows Server 2008R2 box with a single physical NIC. For what I want to do I need two network adaptors in the box. To accomplish this, I added a legacy hardware device "Network ...
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44 views

Route Traffic For Specific IP Range Through Specific Network Interface

On Ubuntu 14.04. I need to route the traffic to specific IP ranges though a specific interface. route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref ...
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44 views

Select source IP on windows server 2012 with multiple IPs on 1 NIC

I have searched a lot for a solution to this case but I couldn't find any. So, any help would be appreciated. I have a windows server 2012 with 1 NIC having 2 IPs bound to it 37.188.120.8 and ...
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1answer
31 views

Virtual interfaces with different MAC addresses

I try to figure out how to set up two logical network interfaces (at one physical interface) with separate MAC addresses on a Linux machine. My first attempt was to use macvlan which seemed to work ...
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Network Card with builtin VPN functionality? [closed]

I am looking for a PCI or PCI Express based Network card with builtin VPN possibilities or a network card which allows to flash its firmware vyatta, ipcop , routeros or any similar os. The idea is to ...
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Windows Server 2008: specifying the default IP address when NIC has multiple addresses

I have a Windows Server which has ~10 IP addresses statically bound. The problem is I don't know how to specify the default IP address. Sometimes when I assign a new address to the NIC, the default ...
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76 views

Creating a bridged network in ESXi VSphere using VSphere client

I'm new to ESXi and i'm trying to configure a small server of guest machines, each running windows 7 starter. my goal is to let the workers connect to the ESXi server, get a windows "computer" and be ...
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109 views

“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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118 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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52 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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63 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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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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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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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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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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72 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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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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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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38 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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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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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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324 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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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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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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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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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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275 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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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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105 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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90 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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188 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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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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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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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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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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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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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: ( ...