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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nic bonding very slow

I have 2 dl380 g9 servers which feature 2 nics with 4 ports each running debian buster. I have connected 7x 0.50m cat6e patch cables directly server-to-server and set the /etc/network/interfaces on ...
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Why is tcpdump not seeing certain traffic

I'm trying to see traffic from a server interface that is receiving port mirrored traffic with tcpdump. Using tcpdump -i ens224 -s65535 -w /tmp/file.pcap I can see that all port mirrored traffic is ...
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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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Is it possible to update HP/Intel NIC firmware?

Is it possible / how to update the firmware (EEPROM image) of Intel Gigabit ethernet cards? I have multiple HP NC365T NICs based on the Intel Corporation 82580 Gigabit Network Connection. Some of them ...
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Do I Need 2 NICs to build a gateway Linux server?

I am not creating a production network. Just one for learning concepts of routing, gateways etc. https://www.systutorials.com/setting-up-gateway-using-iptables-and-route-on-linux/ This article uses ...
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TCP checksum errors between linux apps and NICs

I'm writing an internet application and I'm at the stage of crafting my own TCP packets. Except there is a major problem. According to the TCPDUMP utility in linux, every tcp packet that I send out ...
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50 views

Dell server with NIC that won't show link up

I have a dell server (PowerEdge R330) and I have just tried to liven up the second on board NIC. idrac says it is connected as does poking into the lifecycle setup on boot but ethtool says it isn't ...
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4answers
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What is 25gb ethernet good for? [closed]

I've come across listings for 25gb NIC cards online, from various companies including Intel, Mellanox, and Broadcom. Can someone explain what these are for? Clearly the bandwidth these cards can ...
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25 views

10 NICs in 1U box - possible?

I am looking for a device with 10 NICs in one 1U box. The CPU can be anything even a microcontroller as long as it can process TCP packets. I would prefer a sort of Linux on it but is open to other ...
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50 views

2 IP addresses - 1 NIC or 2 NICs

I have tried searching for an answer to this, but to no avail. What is considered a best practice in a scenario, where you would need to add a 2nd IP address, from a different address range to a ...
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WiFi adapter is delaying packets when low throughput

I was testing a WebSocket connection when I noticed jitter; some TCP packets were getting delayed. So I started pinging the destination. As soon as I did that the TCP packets were no longer getting ...
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Let Debian Stretch Webserver respond on both nics

I got one webserver with two nics in individual subnets 192.168.188.x and 192.168.198.x. This webserver is connected to 2 different routers (192.168.188.1 and 192.168.198.1) and via Portforwarding an ...
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Windows server SMB instances

Is it possible to setup 2 instances of SMB with build-in Windows SMB? For example: folders A, B, C and D are need to be shared. Server has 2 NICs. Is it possible to do that folder A and B is ...
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2k views

How to Install (nic) drivers on TrueNAS

How can one update a network card driver on TrueNAS 12.0? My nic is on the motherboard directly it's a Intel Motherboard DH55HC, the NIC is 82578DC gigabit enabled. I've found the driver directly at ...
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Getting 2g speeds on hyper-v VM through a 10g nic

I'm testing my speeds using IPERF as I've recently installed a 10G cisco switch and intel 10g NIC's on some servers to communicate with a nas server. I noticed my reads and write were awful so I've ...
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WOL on single host with multiple NICS in same subnet

apologies if this has been answered before but I have not been able to find this specific kind of scenario and I'm not sure how to filter search results for something like this. Here is my scenario, ...
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ESXi switch issue with OPNSense

I've got an issue with configuration of 6 port ESXi. I read ESXI single vSwitch with 2 physical NICS and that does not really resolve my issues. I just can't get this configuration below to work. I've ...
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330 views

the latest igb driver version

I tried to make my server NIC driver update, after ethtool -i it show Check version but the latest version on Intel website is lower: https://downloadcenter.intel.com/download/13663/Intel-Network-...
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link gone after making auto-negotiation off on Centos, can't make it on again

I have Supermicro server with X11DPL-i board, the NIC is: Ethernet Connection X722 for 1GbE 2 ports interface 1 : eno1 interface 2: eno2 driver: i40e version: 2.12.6 firmware-version: 3.31 0x80000cd9 ...
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Handle 2 routes to the same destination simultaneously

I setup on my machine 2 different routes on 2 different interfaces to reach a single destination. When I ping a machine on that destination network, the packet go through the route with the highest ...
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359 views

Can not disable autoneg via ethtool

I want to disable the auto-negotiation feature of NIC, I run the following command $sudo ethtool -s ens1f0 speed 10000 duplex full autoneg off Then I check if it takes effect via ethtool ens1f0: ...
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Azure VM, unable to connect from internet on ports configured (9089-9095)

I have created a VM on Azure with below steps:- Created VM Assigned a public static IP Created a new Virtual Network (Subnet default - (10.0.0.0/24) Did not create a NSG initially (NIC NSG was NONE - ...
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rtk8192ee wifi firmare stops loading after ifenslave setup attempt (Debian 10)

I tried setting up Mode 0 NIC bonding using ifenslave between my Ethernet and WiFi cards on Debian 10. After numerous ifconfig wls1 up/down, I was able to set up Bond0 until it stopped working. After ...
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How to direct flows to specific vf queue?

SR-IOV allows us to create a VF from PF, now I want to direct some flows to VF via Flow Director. Here is ethtool help message action N Specifies the Rx queue to send packets to, or some other ...
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325 views

Assign a dedicated NIC to a KVM guest only

My host (Ubuntu 20.04 LTS) has four NICs. I would like to give one KVM guest (Debian 10) exclusive access to one of those NICs. So I set the guest-NIC to macvtap and source mode to passthrough. And ...
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Switching NICs in VPN tunnel

I have question, I have computer with 3 NICs and 3 different ISPs - this will be client of VPN. Is this possible to keep connection through VPN tunnel when I dissconect one of NICs? For example I ...
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1answer
69 views

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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102 views

Should a unified bare metal application suite outperform multiple VMs on the same hardware?

Assuming one single-socket Xeon D server, 8 cores, 16 threads, two 10G SFP+ interfaces, 64 GB of RAM, two SSDs... An application bundle that includes a nginx, MariaDB, some app logic, and maybe Redis. ...
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250 views

Debian 10 and Intel I350 - Interfaces disabled after boot

I have a server with an Intel i350 quad nic on the motherboard (SuperMicro X9DRi-LN4F+). This server ran in production for many years no problems (Debian 9). Recently, I moved the server to a new ...
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1answer
64 views

Routing in linux with two nics

I've been squeezing my mind with this problem since a couple of days, unfortunately I can 't find a way out. May be it's lack of theory or just a bad setup. I will appreciate a bit of help :-) ...
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Removing IP address from server takes down unrelated website

I'm working with a Windows 2008 Server running IIS. One of the websites running in IIS was migrated to another server. As a result, I shut down that site in IIS on the Windows 2008 server. There weren'...
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415 views

Routing issue for windows with multiple NICs

I have a routing issue on a windows box. The windows box has three NIC's with ip's: 10.87.6.27 (no gateway set) 10.87.11.27 (no gateway set) 10.87.60.51 (gateway = 10.87.60.254) When I contact a ...
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1answer
280 views

Maxing Linux networking performance on multiqueue NIC

According to https://lwn.net/Articles/629155/ the Linux kernel, "can only forward something between 1M and 2M packets per core every second" - but how good Linux is at scaling across dozens of cores ...
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Is the total bandwidth for a typical NIC / switch connection full duplex?

I have a standard consumer grade NIC and switch combination connected over cat 5e ethernet, that both support 1 Gbps operation. Is that simultanteous 1Gbps send and receive (full duplex) or is the ...
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Working around bogus Windows-10 default DNS addresses fec0:0:0:ffff::1%1

I have an app that binds to all network interfaces. On one Windows 10 machine it starts VERY slowly. Turns out it's trying to do DNS name resolution for each of several different network interfaces ...
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1answer
83 views

Windows Server 2019 - Hyper-V: 1NIC for server, 1 NIC for VMs

and thanks for reading! I have always been dabbling with networks and I am (very slowly) starting to understand them. I have at work a windows server 2019 which I am using to understand how networking ...
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What happens if I plug a windows 10 pc to the same router using two NICs? [closed]

I have a windows 10 PC. There is an onboard motherboard NIC and an installed PCIe card NIC. I have a consumer grade home router serving as DHCP server, switch, modem etc. If I connect the PC to to ...
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40 views

OpenVPN server in Windows Server to share three different networks to clients

I am relatively new with OpenVPN, but I am able to create an OpenVPN Server on a Windows Server, and connect a client to it. The Windows Server is connected with three NICs: NIC1 - 16.0.0.0/21 (NS: ...
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linux multiple nic same network cannot ping

Basically I have linux with 2 NICs on the same network. The second NIC cannot see anything except for 192.168.3.1 eno1 192.168.3.25 eno2 192.168.3.26 The following scenarios fail: 1. ping -I eno2 8....
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NIC binding order change in Windows Server 2016

Up to Server2012 it was possible to set up binding order via GUI. Since server 2016 Microsoft recommends using interface metric to configure NIC priority. However I have a legacy application that ...
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1answer
4k views

Debain 10 - Installing kernel 5 from backports

I tried to install kernel 5.x from backports in a frsh installed debian 10 and I failed because I have a 10G NIC: echo deb http://deb.debian.org/debian buster-backports main contrib non-free > /...
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1answer
76 views

Server 2008 - Host SMB on one NIC only (without Windows Firewall)

First post here. I have a client with a Server 2008 R2 machine that hosts an SMBv2 share, as well as a non-Windows service on a secondary NIC. We don't want SMB connections to hit the secondary NIC, ...
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1answer
3k views

Ubuntu, two NICs but only one with internet connection

I am having issue with my Ubuntu because I am unable to use wget or access any website with my current setup. I have two NICs, enp2s0 and enp2s1. enp2s0 is connected to the internet but connected to ...
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1answer
106 views

Two network adapters one gateway (UBUNTU)

I have a regular LAN adapter and a PoE adapter on my computer. I have an IP camera connected to the PoE port and on the regular one I am connected to my router. I can access my computer through the ...
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1answer
455 views

Windows Server 2016: No network cable detected after reboot

we recently made the 'mistake' to reboot one of our servers (INTEL Server Barebone R2312WFTZS S2600WFT). All went fine but after the system was up and running we could not connect via network. ...
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Isolating IIS to one NIC

asking if its even possible and how to do it: I have a fresh server (Windows Server 2019 Essentials) with two NICs. I have two separated internet access providers (two ADSL modems). Is it possible, ...
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57 views

Cannot access the server anymore

I was accessing the Windows Server 2012 R2 Remotely which is NIC 1 (192.168.1.x), this server had NIC 1, then NIC 2 (192.168.4.x) which was disconnected. I read somewhere that I can't let NIC 2 ...
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1k views

Windows 10 uses wrong NIC to reach certain IP addresses

I have two servers running Windows 10 Enterprise 2016 LTSB that seem to be using the wrong NICs. The network consists of 2 subnets. So each server has one NIC on the "main" network with Internet ...
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248 views

Emulex OneConnect 10Gb Network Unclaimed

As a novice im hoping to gain a helping hand, Ive recently switched from windows server 2019 over to Centos 7 and the server has a 10gb Emulex OneConnect nic / card installed. When using windows i ...
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Efficient parallel file transfer between two hosts using mutliple 10GbE NIC ports

I need to regularly transfer large amounts (several TBs) of video files between two servers on a 10G network. I want to decrease the overall time it takes to finish the job. I am running CentOS7. I ...

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