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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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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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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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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Amount of incoming and outgoing traffic is different on tunnel interface

I'm running Linux CentOS and are trying to understand some things. I have a tunnel interface and only one single ip rule which directs all traffic from that interface to another server. It seems ...
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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
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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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Create Multiple Bridges in Windows Host to be Used by QEMU VMs

I have setup a QEMU VM with two TAP adapters (i.e. I have two adapter interfaces in my VM), and I am using OpenVPN's ethernet TAP driver to get such adapters. I have two NIC cards in my host machine, ...
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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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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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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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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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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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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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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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265 views

Creating multiple socks5 proxies using a single server with multiple assigned IP addresses

I have a linux server at a webhost, from whom I have also purchased 9 additional IP addresses. In total, my server has 10 IP addresses. I want to set all of them up as SOCKS5 proxies. How do I go ...
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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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PTP control on bridged ethernet ports

I'm having issues setting up an ubuntu machine to control four computer vision cameras using a PTP protocol. Instructions for the camera I currently have access to a 4-port intel i350 based network ...
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1answer
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How to connect subnet on second NIC to internet

I tried googling for a while, but I can't put my problem to a good search query so I can't find an answer for what I'm trying to do. Here we go: I have 3 PCs that I'm trying to connect with my own ...
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1answer
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NTP NIC binding

I'm wondering whether it's possible to setup NTP on a Windows Server running 2012 R2. The catch is that I only want one of the two NICs on the server to be used for NTP. Here's a little more ...
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Restrict a physical NIC or VLAN to a specific process?

On a Windows operating system, is there any way to have an isolated network interface or VLAN, that is only authorized to communicate with specific processes? The interface or VLAN would be ...
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How to set Rx Queue = N in linux / in Qemu / KVM?

I have configured 8 multiple queues on my CentOS VM box (running on KVM). <interface type='direct' trustGuestRxFilters='yes'> <source dev='ens113f0' mode='passthrough'/> <model ...
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How to connect to private Network using squid proxy?

For my test, I have a VM on which I have installed Squid proxy with two NICS. One NIC is connected to the public network and other to my private network. I want to connect to the proxy from the ...
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Net Use Doesn't Work For Second NIC In Windows 7 Pro Computer

I have an Intel E1G42ET Gigabit ET Dual Port Server Adapter installed in a Windows 7 Pro computer (NOT a Windows Server, just a plain old Windows 7 Pro computer). I have setup a 192.168.1.0 network ...
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253 views

About ring buffers' size and configuration

A NIC has (supposedly) two ring buffers, one for rx and the other for tx (correct me if I'm wrong). I read that the values displayed by /proc/sys/net/ipv4/tcp_rmem and tcp_wmem contain the amount of ...
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300 views

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 ...
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191 views

Windows Firewall - Protected network connections?

In Windows Defender Firewall, under Advanced Settings, there is a "Protected network connections" setting for each profile (Domain, Public, Private). An image of this setting: Protected network ...
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When using ethtool -S what is the difference between rx_packets and rx_pkts_nic?

rx_packets are much larger than rx_pkts_nic. Why is this the case? Is there a doc somewhere with explanation of all the NIC stat fields?
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IPv6 NAT information leakage [closed]

Edit: Since I was asked to edit this, I'll ask about an awfully specific issue. The question was obviously never about information leakage on OSI layer 7, since that wouldn't be a network issue. I'm ...
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2+ PORT NIC Explained

I am very confused about two or more port network interface cards (NICs). Does having 2 port on a NIC allow you to have 2 network interfaces? If I go to ifconfig will it list each port as a separate ...
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GCP Routing through VM Instance Network Interface

I am hoping that someone can help with a GCP network problem. I have three VM Instances with IP:10.128.0.2, 10.128.0.4, 10.128.0.5 respectively. I have loaded a software VPN onto 10.128.0.4 and ...
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WS2012, clients lose connection, NIC freeze

Sometimes the server breaks the connection for a moment, for example in RDP or in working programs It looks like a temporary freeze and then communication is recovered. I checked the card logs, no ...
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1answer
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Under volumetric DDoS can I prevent ISP null-routing by turning NIC off briefly?

A server in a data center is getting a volumetric DDoS attack. Congestion starts to build up and the data center/ISP going to solve this by null-routing (RTBH routing) the server's IP address for ...
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148 views

Is it possible to have same MAC address on multiple NICs plugged to same Linux computer?

Can I have multiple NICs in one computer, having same MAC address? OS - Ubuntu Linux. Thanks
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How to connect two EC2 instances using the eth1 interface on both instances?

I have 2 EC2 instances running Ubuntu 18.04. I've attached an additional network interface "eth1" to each instance, so each instance has 2 interfaces( eth0, eth1). eth0 is the default gateway. What I'...
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Communicating with identical IP addresses on many distinct networks [closed]

I would like to be able to connect to a small group of networked hardware (let's call it a Rack) via a switch and a NIC in a Windows 10 Pro computer. The system hardware has fixed 192.168.0.x ...
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1answer
100 views

Why is Debian 9 switching active nics on reboot?

I have been using Debian for years in a production environment. Installations changing from Jessy to Stretch I have noticed that now the NIC's take on non traditional names. They are no longer eth0, ...
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Getting a static MAC address on AWS EC2

I want to ensure that my AWS EC2 instance has a static MAC address (for an app that ties the license to the MAC address). From what I read I just need to add an ENI to the instance to get a static ...
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1answer
350 views

PCI-E lane speed vs NIC throughput

I am curious about NIC troughput vs PCIE slot speed. I have found Mellanox MHQH19B-XTR which claims to be 40 Gbps PCI-E 2.0 x8 cards. However, this slot limit seems to be theoretical ~ 31 Gbps. So, ...
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How do I get a server to host a private network

I am trying to set up a private network. Box A is connects to a router which is connected to the internet, is a webserver, and is also the router for a private network. Box A is wireless connections ...
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860 views

How do I remove the VLAN ID from my NIC (Netadapter)

So I am running a Windows 2019 datacenter server core running hyper-v which has a Broadcom Gigabit Ethernet BCM5720 NIC with 2 access ports. The Server is patched into a VLAN. So earlier on I ...
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2k views

“Cannot set device ring parameters: Operation not supported”

I'm trying to change the RX and TX for an HP BL460C server by using ethtool and get the following: ethtool -G eth0 rx 4078 tx 4078 Cannot set device ring parameters: Operation not supported My ...
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715 views

Ubuntu Server 18.04 two NIC on same subnet

I have Ubuntu Server 18.04 with 2 NIC cards installed and both of them have static IP assigned via netplan. This is my config: root@box2:/etc/netplan# cat 01-netcfg.yaml network: version: 2 ...
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582 views

promiscuous mode when i run wireshark [closed]

I am running Ubuntu Linux and had installed Wireshark on it. I can see the incoming and outgoing traffic just fine. but as you know when you run Wireshark your nic should be on promiscuous mode. ...
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Multihomed Ubuntu 14 using “internally optimized routing”

I have an Ubuntu 14 server which is multihomed with two identical 1Gb network cards. The physical subnet routing is handled by another department. As such, when I want to add a new machine (or NIC) ...
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1answer
579 views

Load balancing multiple NICs on single machine presenting a virtual IP

I've inherited a network setup, where the NFS/Samba linux RAID server ("Ubuntu 14.04.5 LTS") is serving everything over one NIC. As a result, the 1Gb network bandwidth is saturated. Unfortunately, ...
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Simple manual load balancing

We're running a Windows 2016 AD server (ATLB-SRV01.atlb.local) that includes two NICs. We have assigned each NIC a different IP and give them a proper name in the DNS server (type A record). Example:...

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