Questions tagged [nic]
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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Ghost ping on a multi-NIC Linux system
I have a Linux system with 3 NICs & all 3 are on the same subnet. I've setup policy routing on the system with ip rules & ip routes using 3 tables. These are the IPs of the 3 NICs.
ETH0: 192....
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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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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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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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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?
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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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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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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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Setting up two NICs on two separate LANs provides error
I wish I had found this before starting in, but it's too late for that...
I am running CentOS 5.5.
I started following this guide for setting up two NICs on different networks. Everything was going ...
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How to install (old) packages for Ubuntu 9.04?
Based on some excellent feedback by Mark here (Should I clone a physical server to create a vm for a staging server?), today I was able to use the vmware converter to clone my production server for a ...
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Two NICs, one server
I have two NICs on a fresh install of Ubuntu 10.04 LTS. Both are config'd be dhcp. Both cards are on the same lan with same gateway. everything about the cards is the same except the IPs they get, ...
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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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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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How fast is 127.0.0.1?
I wonder if it is tied to my NIC at all or if the OS or driver intercepts and immediately returns data sent to the loopback address?
Does the signal actually travel to my NIC then the NIC returns it?
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Can a single network card have 2 IP addresses?
Are network cards and IP addresses a one-one map?
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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 ...
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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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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 timeout/event ...
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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 ...
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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
Is ...
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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 ...
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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 ...
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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 ...
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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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NIC bonding with two uplinks
Is bonding the preferred way of implementing ISP redundancy?
In the texts I've seen, bond device has a netmask, gateway of it's own. How can this be obtained if there are two different gateways from ...
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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 ...
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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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Disable PCIe device on Dell R610
I have a Dell PowerEdge R610 system sitting in a co-location facility. It has four onboard NICs and a 2-port PCIe NIC in one of the slots. I'm usually working with HP servers, so I have the ability to ...
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Bonding/Teaming 2 NIC cards : pro and cons
I want to get your idea on bonding two NICS on a server that is connected to a single subnet with only one IP address in a Gigabit LAN enviroment.
What is the pros and cons of having two teamed Gibit/...
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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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What command line tools for monitoring host network activity on linux do you use?
What command line tools are good for reliably monitoring network activity?
I have used ifconfig, but an office colleague said that its statistics are not always reliable. Is that true? I have ...
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Getting bind9 to answer on a Dual NIC machine?
I have this problem:
My domain registrar are stubborn, and requires me to have 2 nameservers.
So now I have done this:
ns1.sebbe.biz --> 178.174.190.175
ns2.sebbe.biz --> 178.174.189.82
Port 53 TCP ...
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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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How to properly setup a server "teaming" across multiple NIC's in windows server 2008?
Ok, I have read about installing multiple nic's in a server and expanding the throughput capabilities through load balancing. I might be using this term incorrectly. Now, depending on the application, ...
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machines of two subnets communicate through CentOS(with two NICs)
folks.
Firstly, I really have done a lot of searching, but still couldn't find a problem which was exactly the same as mine, and I have tried some of their answers, but didn't work. Finally, I put my ...
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Simulate network reset or failure in Windows
I have to check if my server application can recover from transient network failures. The application listens on some ports and is a client to backend services. I would like to run some command or ...
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How can I configure a server with multiple IP addresses *without* using virtualization?
If I want to set up multiple IPv6 addresses on a web server, can I do this without using virtualization/VMs?
How would I do this on modern Linux kernels (5.x) or Windows Server 2016/2019?
Relatedly, ...
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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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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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Enabling 8021q on a nic
I'm trying to get a vlan interface on a bonded nic (Centos 5.5) and whilst the interface has been very happily created with vconfig I'm seeing no traffic on it at all. Running tcpdump and tshark on ...
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Assigning two IPs to one NIC in CentOS
I have been following this method described here:
http://linuxwave.blogspot.com/2010/01/setting-virtual-ip-in-centos.html
To assign a virtual IP to one NIC.
Basically I copied ifcfg-eth0 and makde ...
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NIC reordering on RHEL5/CentOS 5
I have an HP ProLiant DL360 G6 containing two onboard NICs as well as an HP NC375T (NetXen NX3031 chipset) 4-port PCIe card. The system was running with eth0 and eth1 belonging to the onboard NICs and ...
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ESXI single vSwitch with 2 physical NICS
So I have read other question related to this and they do not help. Basically I have a network/vSwitch setup with a bunch of VMs. There are 2 NICS, each with a physical computer connected to them. For ...