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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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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66 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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1k 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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2k views

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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418 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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68 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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252 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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78 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 ...
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3k 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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2k views

e1kexpress event log entries for constant NIC connection and reconnection

We were experiencing problems with one of our Windows 7 client applications that maintains a windows file share connection to a local server and it seemed to require lengthy application restarts ...
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716 views

Windows 2012 R2 Server network fails intermittently

I have 2 windows 2012 R2 servers in a production environment. Both are VM's and configured same with the ip address as different. I haven't recieved alert of any kind of network failure for one ...
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266 views

Very high RX errors dropped and frame in eth1 interface

I'm seeing a NIC hang-up/crash on my server and every time i check ifconfig output, it gives me very high errors, dropped and frame: $ ifconfig eth1 eth1 Link encap:Ethernet HWaddr ...
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44 views

Directory Listing Denied Message

Understand that this is the common error for a missing index.* in the location being pointed to by Apache, however I know it to be the case that there is an index.php in the location specified as the ...
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1answer
39 views

Spontaneously unmounting NFS exports and nicstat network activity

We have one server which exports two partitions which are massive (one is 61 TB, the other is 28 TB), and we have a lot of users reading and writing to these when mounted on another machine. We have ...
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46 views

If one subnet can see another does that mean that there is a bridge between two interfaces?

This might seem like kind of a dumb question, but...say for example... I have a router running OpenWRT or some Linux distro and that router or box has two interfaces (lets say for sake of example a ...
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54 views

Dual Homed to speed communication between two servers

I have to RHEL 6.4 servers that each have 1000 Mbps Full Duplex NIC Cards. However, the switch between them is only 100 Mbps. Is there any downside to setting both servers up as dual-homed and use a ...
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204 views

adding a 2nd network card to linux

I'm on linux mint. I've just installed a PCIe gigabit network card (from eBay!) into my linux machine. I've already had to follow this guy's instructions to get the onboard NIC working correctly. I ...
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279 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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2k views

Centos multiple NICs routing issue

I am having trouble setting up permenant routes for my network interfaces, below my config : ETH0 : 172.23.137.27 Netmask /25 - 255.255.255.128 Gateway – 192.168.126.126 ETH1 : Trunk VLAN - ...
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61 views

Can I assign a virtual interface (VPN) to a 'real' interface / NIC of my choice?

I have a small server , running MINT linux with two NICS (eth0 and eth1) and I'd like to setup the MintBox as a VPN client to connect to a web-hosted VPN server. All works wonderfully on the VPN ...
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4answers
177 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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8k 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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2k views

Issue with Intel i350 NIC

We are frequently facing an issue where one of the network interface(Intel Ethernet Controller i350) goes down often with the kernel log having some call trace and an error saying: [202323.307358] ...
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2k views

Xen 6.2 - NIC bonding - LACP or active/active?

I have 3 XenServer 6.2 machines with 4x 1Gb NICs. Would I be better served by: putting these in an LACP bond at the switch putting these in an active/active at the xen server leaving them separated? ...
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181 views

Extremely slow network and half duplex

I am having an extremely slow network netperf -H 11.x.x.21 TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 11.x.x.21 (11.x.x.19) port 0 AF_INET Recv Send Send Socket Socket Message ...
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5k views

Setting 2 IPs on Ubuntu 12.04 with two network adaptor card

There is a VPS runing ubuntu 12.04.3 server on vmware esxi 5. It has 2 valid static IPs and two network cards eth0 and eth1. but only one of the assigned ips is pingable from outside. (both ips ang ...
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218 views

Second IP for VPS on VmWare ESXI?

I bought a VPS Server run on vmware ESXI and this server just had one IP; Now I decided to ask from the reseller to give me another IP; He says in order to do that he have to remove my account and ...
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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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112 views

Why are we having problems with multiple nics in office and production networks going to 100mbps mode?

updates and additional info 2 environments, office and production at datacenter Both environments have Cat-5e cables, a cable was replaced when it tested as bad with Broadcom's cable testing, and ...
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126 views

Network card capable of capturing a tonne of packets and not dropping them?

Edit: Our server is trying to capture packets at between 500-600Mb/s, but is dropping packets 'due to kernel'. Data is being written to SSDs, and isn't bottleneck there. What things should I look ...
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70 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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557 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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148 views

Move a NIC to another PCIe slot

I have a server running OpenSuse with a 10Gbe card (Intel 82599eb) and the driver is installed and it is working correctly. I need to move the card to another slot. However, when I do so, the card ...
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48 views

Two network interfaces access from the third subnet

I faced the following problem. There is server (Ubuntu 12.04) with two NIC that have IPs 192.168.40.147 (eth0) in 192.168.40.128/27 subnet and 192.168.40.165 (eth1) in 192.168.40.160/27 subnet. Now we ...
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799 views

How to see all nics in Solaris 8/9

I have a questions regarding how to see all NICS in the solaris 8/9 SPARC boxes. Even if they are active/inactive. dladm show-link command does not work. cat /etc/path_to_inst could but it's hard to ...
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178 views

Unexplained Packets being dropped

I have two servers one sending large amounts of data to the other, we are noticing that one server is sending data to the other but the receiving server is missing some of the data or packets. I am ...
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71 views

No access to our server outside LAN

I hope this isn't above the scope of ServerFault. If the question doesn't work here, some direction would be helpful. We've got an Ubuntu development server with 2 nics. One has a public IP and one ...
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67 views

2 NIC's with ESXi [closed]

Good day all, I have an ESXi server running in a Data Center. The server is connected to an HP Pro Curve 2810 switch on NIC 1. I have a second NIC on the server which I want to connect to a second ...
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6k views

LOM vs. NIC for iDRAC with Dell PowerEdge R720xd

I'm trying to get going with iDRAC 7 Express (no Enterprise license so we can't use the dedicated port). In the setup menu for iDRAC, it asks to choose which network interface to use for iDRAC. ...
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180 views

How to bond NIC on a virtual machine?

I'm puzzled about this process. Historically when I've setup an LACP bond on a piece of physical hardware I have to create the analogous setup on the switch. How does this work with a virtual machine ...
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2k views

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
154 views

How does a NIC send a hardware interrupt? [closed]

Some context. A few weeks ago, a NIC was replaced on a box without much troubleshooting to find a clear resolution to the problem. A senior administrator got into a small tiff with an entry-level ...
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1answer
1k views

How common are Intel igb NIC drivers/cards, compared to Intel e1000, etc.?

I'm troubleshooting VMware ESXi host network and connectivity issues stemming from the use of Intel NICs who require the igb driver. The chipset is Intel Corporation 82576. VMware has a few ...
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3answers
3k 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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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 ...
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228 views

Centos 6.4 2 NIC same gateway

I'm having a problem with my centos server setup, i have 2 public nic and they have the ip from 209.59.252.0/24, with the same gateway. The problem is that only eth0 works, the other one doesn't. They ...
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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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640 views

Windows Server 2012 after restart public network become private

I have a 3 servers with Windows Server 2012. After restart one server : public network become private and private network become public. (2 NIC) I don't know how this can happen and how to fix it ? I ...
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275 views

Hosting multiple socks proxies on a single server

I have multiple public IP addresses assigned to a single NIC in a Windows Server 2012. I want to be able to use each IP as a socks proxy server which has to be accessible from other Internet users. ...
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511 views

Two NIC card with same mac address

Yes its very strange but I have got two server having same H/W MAC address. The issue which I am facing is again very strange. 1st Server is normal windows server. 2nd Server is running KVM on ...