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 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 ...
19
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2answers
6k views

What is the command to flash a NIC link light?

I remember using a command line tool to flash a NIC's link light to identify it. I can't remember for the life of me what it was.
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7answers
5k views

How fast is 127.0.0.1?

I wonder it it is tied to my NIC at all or if the OS or driver intercepts and immediately returns data sent to the loopback address? Do the electrons actually travel to my NIC then the NIC returns ...
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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, ...
17
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2answers
892 views

What is the fall off of subsecond throughput on Ethernet Network Interfaces

On a network interface, speeds are given in term of data over time, in particular, they are bits per second. However, in the uber-fast world of computing -- a second is kind of a really long time. So ...
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2answers
1k views

Multiple IP addresses per NIC

How can I have multiple IP addresses assigned to a single NIC? I remember doing this on Unix way back when. Can it be done on Windows?
9
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10answers
7k views

Is there any reason to have 2 NICs on a server?

Is there any reason to have 2 NICs on a server BESIDES the following cases? You need to connect to 2 different physical networks Redudancy (1 NIC fails, so you use the other) Are there any other ...
9
votes
2answers
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 ...
9
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2answers
678 views

MAC addresses on dual-NIC mainboards

Here's a weird problem. We've got a number of devices with dual-NIC mainboards. Some are Realtek NICs, which suck. Some are Intel e1000s, which don't. I've just noticed on 2 machines, one is an ...
9
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2answers
12k views

Many dropped packets of my NIC

I have a server running on CentOS 5.3 (a comet chat server, will have lots of tcp connections). Recently I found it was very slow (http service and ssh) so I use "ifconfig" command to figured out what ...
7
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2answers
386 views

Can I have 2Gbit over 1Gbit Nics [closed]

So this really baffles me. Apparently because 1Gbit can transmit data in both directions simultaneously it should be possible to get 2Gbit of data transfer on a single NIC (1Gbit flow seend and 1Gbit ...
7
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2answers
4k views

NIC Teaming with Broadcom on HyperV 2008 R2

I have a HyperV cluster made up of 3 hosts. Each host is connected to both of my Nexus 5548 switches running in an etherchannel. LACP on the switch and NIC teaming using Broadcom 802.3ad on the server ...
6
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3answers
1k views

So what really makes a server grade NIC?

We have a couple servers hosting Citrix VM's. We are planning on adding SAN storage to our network so that we can do the quick migration and high availability thing. The question comes up with ...
6
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3answers
2k views

Is APC's smart-signaling cable (940-0024) really proprietary?

First, not sure if this question belongs here or SU, so please advice accordingly before wildly down-voting or blasting me. We have a UPS unit for which we recently configured to work on our network. ...
6
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5answers
8k views

Is it possible to connect a single NIC to two different VLANs?

I know it is possible to assign multiple IP addresses to the same NIC as long as they are on the same sub-net (e.g. server A can be assigned both 192.168.1.1 and 192.168.1.2). However, is it possible ...
6
votes
5answers
255 views

Is it “OK” to use a low end NIC for a dedicated heart beat between two servers?

I've got nice big server-grade NICs on my servers busy interfaces. Soon I'll be setting up a cluster that will have a dedicated heat-beat. Do I really need to use an expensive server grade NIC for ...
5
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4answers
24k views

PCI Express x4 network card into PCI-Express x16 slot?

Is it possible to plug in PCIe x4 NIC into PCIe x16 slot?
5
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1answer
12k views

How GRO (generic receive offload) works on more advanced NICs?

I am interested in particular answers: Does the NIC with GRO edits/creates TCP ACK or any other packets (or is this feature transparent to receiver/sender TCP stacks)? There should be a ...
5
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3answers
444 views

Bonding with 2 NIC's and 2 reserves?

I have a server with 4 ports (2 adapters with two ports each). I want to connect two ports to the local switch and two other ports to the external switch. This local switch has an uplink to the ...
5
votes
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 ...
5
votes
1answer
2k views

Intel NIC X540-T1 non-functional in Ubuntu Server 12.04

I have installed three Intel X540-T1's in servers running Ubuntu Server 12.04, but all are non-functional, no link lights, no packets sent or received, and no connection on ip4 or ip6 whether set up ...
5
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3answers
1k views

Broadcom BCM5716 Hangs on CentOS 6 Boot

I have a fresh CentOS 6 installation on a Dell R310 server with a Broadcom BCM5716. The onboard NIC is causing the boot to hang for some reason. Welcome to CentOS Linux Starting udev: udev: starting ...
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2answers
3k views

What is my NIC ID?

I need to get my NIC ID for a temporarily software license to be generated for me. How should I find my NIC ID? I have found contradictory information on the web. Some suggested that I run ...
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votes
6answers
4k views

How do I point my browser to a specific NIC on my machine

I am on a local area network that has no external access to the internet. However I have been tasked to find a way to allow certain machines to access the web (HTTP, HTTPS, etc) via a wireless card ...
4
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1answer
8k 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 ...
4
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2answers
5k views

NIC Active/Passive bonding with priority

I will configure a bond of three NIC's. I want to define which one will be first used and which NIC will be used as the second and third NIC when failover is done. Is this possible? Thanks
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2answers
4k views

Dedicate a NIC to a Virtualbox VM

On a machine with multiple NICs, running either Windows or Linux, is it possible to dedicate a NIC to a VM such that the host won't even try to use it for itself? I suspect it isn't even possible but ...
4
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1answer
145 views

NIC reporting as devXXXX and not ethX

We recently noticed our 10gE NIC was reporting as devXXXXX. Does anyone know why this would be given this name as opposed to ethX? Our System: The issue occurred on two separate servers. We are ...
4
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3answers
1k views

Phantom NIC issue causing eth0/1 to drop out

We are experiencing a very strange and frustrating problem. Our company has servers here in Massachusetts, as well as in California. The issues we are seeing are only on the CA hardware. Out in CA, we ...
4
votes
2answers
3k views

How to improve Intel X520-DA2 10Gb NIC throughput without Jumbo packets

Here's what I have done so far: Using more Rx/Tx buffers boosts performance the most from defaults. I set RSS Queues to 4 on each adapter, and specified starting RSS CPU on the second port to ...
4
votes
2answers
128 views

dual interface NIC with hw bridging?

I'm looking for a PCI NIC with two PHYs that is capable of bridging/switching in hardware but allows the host to monitor the traffic. Does such a thing exist? This would be running on a linux host. ...
3
votes
7answers
4k views

4 NICs or 4-port NIC?

I want to setup a firewall handling two ISP connections and two routers. For that I am planning to use an old Pentium 3 machine. Now, should I use four network interface cards or a 4-port NIC? Do ...
3
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2answers
590 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 ...
3
votes
1answer
4k views

Multiple NICs with static IP address, default gateway problems

My server is running Ubuntu 10.04 64bit and have 2 NICs, my configuration is one interface for incoming/outgoing traffic of all the KVM guest running on this server, the other interface for different ...
3
votes
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 ...
3
votes
3answers
1k views

Cisco SG 300-28P PoE switch appears to have damaged my domain server's network IF

I just replaced the old HP ProCurve switch with a new Cisco SG 300-28P managed switch. It has PoE on all ports. Everything works, except for my domain server that went offline and the network ...
3
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2answers
1k views

PCI Express x1 Network Card on PCI Express x8 slot

I have a Fujitsu Primergy TX100 S2 server and I want to add more network cards. The only PCI slot is already occupied with a NIC. I have available one PCI Express x4 slot and two PCI Express x8 slots. ...
3
votes
2answers
13k views

“System cannot find the file specified” trying to reinstall network driver

After uninstalling Symantec Enpoint Protection (manually) one computer (Windows XP) has an inoperative NIC; it shows up in device manager as conflicted. I tried doing a windows repair from CD, which ...
3
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2answers
3k views

ESXi vswitch with 2 physical nics, does it actually use both nics?

Fairly new to ESXi, using 4.1 Has a vSwitch setup with both physical nic cards, one of them is for the public network of the host server and the other is for the private network. Without mapping one ...
3
votes
1answer
2k views

How to install (old) packages for Ubuntu 9.04?

Based on some excellent feedback by Mark here (http://serverfault.com/questions/285598/should-i-clone-a-physical-server-to-create-a-vm-for-a-staging-server), today I was able to use the vmware ...
3
votes
5answers
2k views

How to route all traffic to one host trough one of two nic's on linux

Setup as follows: One gateway/firewall One switch Two servers behind firewall with 2 NICs each. Each NIC is connected to the switch. The servers are running Ubuntu server. One of the two NICs ...
3
votes
7answers
8k 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 ...
3
votes
2answers
145 views

Is there additional risks to firewalling between VLANs on a single Dot1Q trunk, as opposed to discrete ethernet links?

I'm looking at implementing a pfSense firewall on a network, and I've a number of options when it comes to implementation. Specifically, I can either: Stick each network zone (WAN, DMZ, core) on ...
3
votes
1answer
3k views

Can I create a virtual internal network for my virtual machines in ESXi without using a physical nic?

Using ESXi 4.1 Want my Virtual Machines to be able to communicate with each other, share files, etc. I have 2 nics that go from the server to the network (one public and one private) however these ...
3
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2answers
1k views

Using DHCP with Multi-Homed NICs

I am trying to steer away from our current manual addressing system and embrace the decades-old wonder of DHCP. In our domain and even at my home network DHCP is great - I can use address reservations ...
3
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1answer
125 views

Network issue - Very slow while RXing but TXing is fine

I am trying to transfer a 10GB file to test my network. But when I transfer from Workstation 1 to Workstation 2, it takes 8 minutes (which is fine). But from Workstation 2 to Workstation 1, the ...
3
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1answer
3k views

Assign individual NIC to KVM guest

I have a server with 6 NICs installed and is running Ubuntu 12.04LTS. I want to setup 4 guest VMs using kvm. Now I want to assign 2 NICs for the host(1 Public IP and 1 private IP), and 1 NIC each to 4 ...
3
votes
1answer
478 views

Does Intel vPro work via add-on NICs?

We're currently using Dell OptiPlex workstations with the Intel vPro feature. A remote location is requiring their computers be connected via fibre for security reasons. This will require us to ...
3
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1answer
5k views

Have Dedicated NICs for Virtual Machine on VMware Server?

I have a Windows Server 2008 R2 box with multiple NICs (only one of which is currently in use). I have VMware Server installed on this box running a VM. I'd like to dedicate one of my free NICs on the ...
3
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2answers
906 views

how to add iptables rules for two NICs on CentOS(act as a gateway)

I have a machine C with two NICs, namely eth0 and eth1, with CentOS 4.9 installed on it. Also I have a machine A connecting to C through eth0 and a machine B connecting to C through eth1. Now I want ...