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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Internet access without NIC card? [migrated]

If have a USB modem dongle for INTERNET connection. Can i access INTERNET from a brand new desktop/laptop without NIC card using this dongle? I feel that the dongle is just a modem ( with a DHCP ...
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79 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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41 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
45 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
61 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
53 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
47 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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25 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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2answers
143 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
154 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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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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3answers
884 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: ( ...
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82 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
85 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
58 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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63 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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1answer
127 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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182 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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1answer
39 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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1answer
102 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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2answers
1k 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
576 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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39 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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528 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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3answers
207 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
59 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
156 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
57 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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303 views

NLB + NIC teaming

We have server HP ProLiant DL360p Gen8 with Windows Server 2012. Couple months ago I created a team NIC Teaming (use 2 network interfaces, the other 2 are disable and not connected). Also NLB ...
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2k 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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880 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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371 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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228 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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37 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
35 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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1answer
44 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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131 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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1answer
212 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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741 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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52 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
131 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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1answer
5k 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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1k 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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1answer
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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142 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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4k 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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192 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
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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1answer
109 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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105 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 ...