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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Multiple Nics, multiple default gateways on a Server 2012R2 cluster

This is really just a question about best practices as there seems to be a little confusion. The physical hosts of our Hyper-V cluster have 4 Nic interfaces relating to the 4 subnets. Now, when ...
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19 views

How do I force specific interface to use different driver in RHEL?

We have Dell Poweredge 630 server which has 2 NIC Interface. We bought Intel's FTLX85.. module for those 10Gbit ethernets. 2 interfaces were using bnx2x driver of Broadcom. I installed Intel's ixgbe ...
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20 views

Assigning 2 IPv4 blocks to one interface

I have been assigned these 2 blocks by my provider Block: x.x.x.184/29 Usable range: x.x.x.186 - x.x.x.190 Gateway: x.x.x.185 Subnet: 255.255.255.248 And Block: x.x.x.192/29 Usable range: ...
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56 views

How many NIC's in relation to processor cores? [closed]

I have server with four cores procesor (non HT) and two NIC's onboard. Is it reasonable to add four additional NIC's (ie. Intel PRO/1000PT) or only two new NIC's will be enough (ie. Intel PCI-E ...
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1k views

Intel Corporation 82540EP NIC and “rx_missed_errors” at 140Mbps

I have an Intel Corporation 82540EP Gigabit Ethernet Controller which uses module e1000 version 7.3.21-k8-NAPI. While it is a GigE NIC, I receive "rx_missed_errors"(ethtool -S eth0) already in case of ...
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what are the memory impacts of increasing a NIC's ring buffer?

What impact (if any) does NIC ring buffer tuning (e.g. via ethtool -G eth0 …) have on system memory utilization? For example, does increasing the ring buffer consume more RAM? And if so, how much? Or ...
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26 views

QEMU/KVM nic properties

1) What's the use of the addr value when specifying a new network interface on QEMU/KVM ? Example: qemu -hda deb.img -net nic,addr=192.168.1.10 2) Is there a way to specify directly the IP address ...
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45 views

Route Between Two Virtual Interfaces on one NIC Linux

I have an Ubuntu machine that is my firewall The Machine has 2 NIC Cards. eth0 and eth1. eth1 is connected to a modem that gives it an IP of 10.10.1.X eth1 is required to provide DHCP on 192.168.2.X ...
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516 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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31 views

IP address change eventlog in Windows System

Domain Controller - Windows Server 2008 R2 Standard Client OS - Windows 7 prof. Recently on one of my Windows Server 2008 R2, the ip address has been changed. So i need to know how it has been ...
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49 views

Windows Server 2012 NIC Teaming vs. MPIO [duplicate]

I've got a server with Windows Server 2012 R2 installed on it. 1 NIC on the server is used for management purposes and I've teamed the 3 other NICs which communicate with our SAN to carry out VM ...
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22 views

NIC Team, Trunking, WS2012/HP2920

I have another problem. I made a NIC Team on Windows Server 2012 R2 containing 2 Interfaces. It's created as LACP. Also, on Switch HP2920 I have two ports as a trunk (trk1), and also as LACP. When I ...
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3answers
713 views

Where to download the latest 2.4.x Linux kernel while kernel.org is down? [closed]

I need to run the pre-paleolithic (10 years old!) SuSE 7.3 under VirtualBox. (Don't ask. I just do, ok?) I managed to successfully install it. It boots. It recognized the virtual NIC (pcnet32 module) ...
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2answers
51 views

CentOS 6, 2 NICs, 1 gateway, 1 NIC doesn't work right

I have a CentOS 6 install that had 1 NIC, eth0, working fine I added another NIC, eth1. Both NICs are on the same switch, and same LAN. I copied ifcfg-eth0 to ifcfg-eth1, and then simply changed ...
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1answer
81 views

How do I troubleshoot slow NIC on R610 Dell?

I recently set up 2 new R610 servers that I purchased. Summary: Both servers 100% same hardware Both installed with Centos 6.7 64bit Tested multiple switch ports, same slowness issue. Both same full ...
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24 views

RSS hash tuning for mellanox NICs on windows

I found this document that mentions about changing the RSS hash algorithm for small number of connections. The default RSS hash calculated by the adapter is a Toeplitz function. On some ...
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How can force mailslot to broadcast traffics on all network interfaces of the system?

I have two PCs running on win7 and each one is equipped with two network adapters. Both system can see each other shares on both NICs. I also have written a simple client-server mailslot. Client is ...
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1answer
57 views

QNAP TS-EC1279U with X520-DA2 (10GBe) Loosing NIC conneciton after workstation reboot

=== Configuration=== Your Operating System you are using to access your NAS. Win 7 NAS model: TS-EC1279U-RP Firmware Version/: 4.1.4 Network Setup Single Port Static IP (192.168.1.199) (10GbE) ...
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87 views

Setting up 2 NICs, 1 for Internet 1 for Phones

I have FreePBX setup and it has 2 NICs. I've been trying to configure it out so that: eth0 will continue to be the one used for all the office phones and internal calls; and eth1 is the new NIC ...
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1answer
41 views

Server 2008 - 1st NIC's traffic stops when 2nd NIC is plugged in

I have a file server running Windows Server 2008 R2 with 2 NICs in the back. These are their configurations: Connection #1 Local Area Connection 10.1.37.6 255.255.255.0 [No Gateway] Connection #2 ...
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1answer
14 views

Win 2012 - Create new NIC team only shows me virtual NICs, not the physical NICs, why?

I am setting up a new win2012 server with NIC teaming. The server has two physical NICs and I want to create one NIC team in the management OS that uses both NICs. My problem is that when I installed ...
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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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33 views

TP-Link TG-3468 on an IBM x3850 M2

I got a networks card from TP-Link. It is the TG-3468. I wanna place it into my IBM server x3850 M2. It has PCIe x8 slots. The slot is a little bit longer than the lenght of the card, but it fits. ...
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How can I configure each Windows user to have unique ip address

We have multiple Windows users on a single Windows 2008 R2 server (Standard edition), say 10 users. We would like each user (or program running in that user session) to utilize a separate IP address ...
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57 views

Isn't setting “Number of RSS queues” to “1” pointless?

If I understand RSS (Receive Side Scaling) correctly, the src/dst IP+port combos of incoming UDP and TCP packets get hashed, and the packet gets distributed into the available RSS queues using that ...
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1answer
973 views

Intel igb driver building with checkinstall

How to properly compile the latest Intel igb driver (4.1.2) with checkinstall ? When I am trying to do this I got following error: *checkinstall -D root@debian:~/igb-4.1.2/src# ...
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1k views

why 5 rx queues per NIC

On my office server, the output of cat /proc/interrupts displays one tx queue and 5 rx queues. Is this due to NIC hardware capabilities or can you configure multiple receive ring buffers in linux per ...
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33 views

Setting Up Usable IPS on Debian

I have a dedicated machine that I am renting with 5 usable IP. The only issue is that only one IP is set up to be public and I'm trying to get the others to be public. I've tried following a few ...
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CentOS, 4 NICs: two teams redandant, each team has 2 NICs, is it possible?

We have one CentOS7 or RedHat 7 "BIG" HP Proliant DL360 Gen 9 server with 4 NICs, two external switches Switch 1 and Switch 2 and many "small" servers. Those small servers have two NICs: those NICs ...
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55 views

Frame error on Primary NIC

I have a 25 Node Cloudera cluster and on all the nodes i am getting critical warning Network frame errors account for 0.95 of incoming network packets over the past 15 minute(s) across all monitored ...
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114 views

Change Xenserver 6.5 MTU

How do I go about change the MTU setting for my management interface in xenserver 6.5? Right now its set to the default 1500 but I want to increase it to 9000. For my setup I have 2 nics on each host ...
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1k views

WMI and adding Multiple IP Addresses?

Is it possible, with WMI, to bind IP addresses to a NIC? I have been able to enable a static IP, but I can't seem to find any information on adding additional IPs. this code helped and after I ...
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54 views

After copying Xen DomU to another machine, all network config in Windows is lost

Background Our company have about 40 Xen domains installed on single server, installed and managed by suite of proprietary programs. Most of the virtual servers are managed by our customers, and we ...
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107 views

One Web Server Two NIC with Two Different Wan Network

I got one Web Server (IIS), MS windows server 2012 with two nic and want to connect this two nic to different ISP with different public ips address. I got totally seperate set of infrastructure of ...
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1answer
857 views

How can I stop Azure from randomly replacing network cards on VMs?

Azure seems 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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159 views

Intel NIC teaming or server 2012 R2?

I'd like to implement NIC teaming on one of my servers and would like to know if it's better to use the Intel NIC teaming from the drivers or to use the NIC teaming from Windows Server 2012 R2.
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Windows Server 2012 r2 standard with dual NIC + DHCP

Currently I have a physical host with Windows Server 2012 r2 standard installed and DHCP role enabled. In addition the physical host has two network interface cards. I am planing to connect the ...
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10k views

Setting up routing in CentOS 6.4 as a router/DHCP server with two nics

I am stumped about how to setup centOS 6.4 to route packets. |Local Network| -eth0- |CentOS 6.4 box| -eth1- |Internet| The centOS box has a dhcp server running. Currently it is handing out IP ...
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Disabling bypass mode on Intel NICs

I'm trying to install PFSense on some decommissioned firewall gear. I've installed PFSense just fine, except for the two NICs are stuck in bypass mode. I don't see any options in the BIOS to edit ...
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215 views

After making my VM highly available I get “Could not find Ethernet switch” error when trying to live migrate

I normally create new VMs from the Failover Cluster Manager GUI. But this time around I went a different route because I had to (due to time constraints and available resources at the time). For ...
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1answer
83 views

Windows Dual NIC - Will this setup cause an ip address conflict?

My company has three subnets total of which two subnets have the same set of ip addresses... 192.168.0.x. This has not been an issue before but we are going to establish a VPN connection between ...
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9k views

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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Cannot connect two different networks on rhel6 on 2 virtual NIC's

I have a RHEL6 machine on VMware with 2 Virtual NIC's. The output of the ip's and networks are as below: $ ip a|grep "inet" inet 192.168.17.128/24 brd 192.168.17.255 scope global eth0 inet ...
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92 views

nic configuration on a linux virtual machine (rackspace)

I am trying to check my nic speed and duplex setting on a vm I have at rackspace. It is centos 6.4. When I run: # ethtool eth0 Settings for eth0: Link detected: yes This is all I get back. ...
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Force local IP traffic to go through LAN WITHOUT ip address changes

I know there's some topics about forcing local IP trafic of a Linux machine to go through the LAN (over the network where a WireShark is captuting trafic) but all solutions implies IP address ...
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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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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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104 views

NIC seems slow, even on 100Mb/s full duplex [closed]

So I have a server running Centos 6 64bit with cPanel. It's set on eth0 running at 100MB/s full duplex. But, one particular server seems sluggish on its connectivity, despite server load being minimal ...
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Nic Teaming Windows Server 2012 R2 - No network connection

I have 2 100Mbps NIC cards installed into PCIe slots and connected each card to it's own desktop 8 port switch. My Settings: Mode: switch-independent Load Balancing: Dynamic / Address Hash VLAN: ...
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2k 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 ...