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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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Windows machine with 2 NICs

I have 2 networks connected to my work PC, we'll call them NET1 and NET2. NET1 has internet access and NET2 doesn't. NET1 is a work network which I have no control over. My work computer is ...
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13 views

No network interface when raid controller plugged in [on hold]

I've started to build a home NAS server. When I plug the raid card to PCI-E slot the network interface disappears. I'm using Ubuntu server 18.04 and LSI SAS9217-8i. I tried to figure out what could ...
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22 views

Transfer Speed Limited by Fileserver?

We have a 4gbit teamed nic fileserver that hosts smb shares. The files it accesses are from an ISCI NAS drive which is 10gbit. Will transfer speeds be limited by the file server? Or does the ISCI "...
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78 views

Gigabit modem to switch gigabit uplink?

Times change, and we are adapting to now having gigabit internet service at a local charity. Since there is a gigabit uplink on the switch already in place (Netgear FSM726) I was wondering if the ...
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59 views

Assign Host LAN IP from Guest DHCP and get internet working

I am running sophos XG in a VM using kvm libvirt. I have a 4 port NIC (I350-t4) and 1 motherboard NIC. One of the 4 port NIC is PCI passthrough as the WAN interface (connected to modem). The other 3 ...
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17 views

Not able to connect provider (physical) network

Background: I have an OpenStack installation (rocky release). The configurations made are: One controller node One compute node Self service (networking option-2) Problem: When I create a private ...
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1answer
61 views

Uninstall TCP/IPv4 (Server 2016)

In Microsoft Windows Server 2016 Datacenter there is a properties window for network interfaces, inside that properties window there are several checkboxes that control protocols. (Internet Protocol ...
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2answers
85 views

How to specify a NIC number in virsh/kvm?

Hoping I can get some help here. I am using the virt-clone command to get an image of VyOS (open source linux router). The clone works fine but when I copy the image to another KVM host and install ...
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1answer
42 views

bonded ethernet NFS use both NIC's possible?

I have a box with two 1Gb NIC's in it, bonded. The type of bonding is "per connection" so each connection goes "to 1 nic" but if a process has multiple connections, it will share the bonded NIC's and ...
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1answer
56 views

Dual Interface Network Card Issue on 2nd NIC

I'm working on reconfiguring an existing production server and having trouble with a dual port Intel PCIe card. It's running CentOS 6.4 [2.6.32-358.23.2.el6.x86_64] and it seems like it's a driver ...
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1answer
89 views

What does rx_csum_offload_errors mean?

I see too many rx_csum_offload_errors on ethtool output and it constantly increases. What is the reason of these errors and how can I fix it? # ethtool -S enp12s0f0 | grep error rx_errors: 0 ...
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34 views

Kernel - Identify if NIC is multi-queue enabled through IRQ

I am trying to understand the relation between the IRQ mapping and the multi-queue enabled/disabled status in NIC. The script in the following git location gives the details about the IRQ mapping for ...
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1answer
42 views

Interface Masters Niagara 32264 Bypass Mode issues

We have several deployments of ClearOS 7 servers (hardware: Dell PowerEdge T30) on our clients' networks functioning as gateways. Recently I've been having a problem getting the Interface Masters ...
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1answer
55 views

Multi-NIC Linux VM (ubuntu 16.04 LTS) in Azure and default gateway route

Can some one please share steps on how to add default gateway address route permanently to the route table on Ubuntu 16.04 LTS on Azure for the secondary nic? As you know Azure DHCP only populate ...
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1answer
104 views

iptables Source NAT with Multiple NIC & Public IP Addresses Not Working

I just have a problem on the multiple NIC & IP addresses server. I've configured my Cent OS 7 server with an additional public IP address which belongs to eth1. When iptables source NAT enabled, ...
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1answer
59 views

linux port forwarding between two nics [closed]

I have a vicidial server running on suse. I have installed two nic cards. One nic connects to my local network and the other connects to the firewall. The config is as below: Nic 1 : 192.168.2.21 (...
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112 views

How to change default gateway nic?

My /etc/network/interfaces looks like this: # The primary network interface allow-hotplug enp3s0 iface enp3s0 inet dhcp # iface enp3s0 inet6 dhcp # USB 3.0 Gigabit Ethernet allow-hotplug ...
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38 views

How to connect two different networks hosted on 2 different NICs

I have a Windows 2012 R2 server which has 4 NICs. Two of these NICs are connected to seperate private networks(not connected to internet). NIC3 is connected to 192.168.137.1 (Subnet mask: 255.255.255....
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1answer
373 views

ESXi VMs randomly lose network on reboot; only resolution to pull NICs and reassign new NIC driver with static MAC

We have one ESXi server (HP-ESXi-6.0.0 build-2492585) that has multiple VMs on it that have exhibited the following behavior: When the VM is rebooted it will occasionally just lose all network ...
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90 views

Asterisk/SIP - server with two NICs

We are trying to setup our Asterisk server with two NICs on it. One NIC is used to connect to a local network (which has access to internet and other sip trunks over internet) and other NIC is a ...
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10 views

Can I choose any qsfp28 optical cable for mellanox mcx455a-ECAT 100g cards?

I purchased 2 Mellanox MCX455a-ECAT pcie cards (using qsfp28 connectors) which I want to deploy peer to peer between two machines. For that purpose I need to purchase a cable. As the machines are more ...
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22 views

2012 R2 ESXi VM losing connectivity

In order to deploy a web application, I was asked to set up three servers. Two Web server (IIS) and one SQL Server. Everything is fine for the firs two servers (IIS), but the SQL server, which is a ...
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1answer
57 views

How to rotate IPs using iptables having 2 NICs

I have 2 network interfaces in an ec2 linux server (eth0 eth1). After configuring the second NI (eth1), I'm able to ping both public IPs from eth0 and eth1 as to connect through SSH. Now, my idea is ...
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85 views

Two Cisco routers connected through BVI (Bridge Group Virtual Interface)

I have two Cisco 1921 routers which are now connected with VPN Tunnel. Now I want to connect them with a BVI (Bridge Group Virtual Interface). I have a dedicated link from my carrier. My problem is ...
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47 views

How can I configure a storage server to provide data delivery on two separate networks?

I have a storage server with two NICs - each with two ports. The one NIC is 1 GbE, the other is 10 GbE. I have a 10 GbE switch and have Cat6a running from the two 10 GbE ports into the 10 GbE switch. ...
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1answer
121 views

What is the term for assigning multiple IP addresses to single NIC within the same network?

I've been looking for the term used to define the process of assigning multiple IP addresses to single IP address. A similar term that I found so far is Multihoming but, this isn't quite what I'm ...
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32 views

Can a wireless card simultaneously sniff packets and inject packets in monitor mode?

I wish to put a wireless NIC that is capable of monitor (rfmon) mode into monitor mode and simultaneously inject packets over said wireless NIC. Would I have to write my own driver, or download ...
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54 views

Multiple NIC on same subnet with one port disconnected

I have a Linux system with 3 dedicated NICs & all 3 are on the same subnet with the following IPs ETH0: 192.168.1.10 ETH1: 192.168.1.11 ETH2: 192.168.1.12 I've setup three routing tables & ...
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1answer
146 views

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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1answer
147 views

Port forwarding by MAC address problems

I have a server sitting behind a Huawei HG569 router. Port forwarding has been set up through the router and, when it works, it works as one would expect. Now, the problem is that the HG569 router ...
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57 views

Netsh event tracing packet capture shows packets; application not getting them

I have many similar Windows 10 machines running a similar set of applications. A number of applications are multicast UDP listeners. They each have massive socket buffers (they could hold 10 sec+ of ...
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2answers
701 views

Hyper-V 2016 Server and NIC Teaming

I am setting up a new Hyper-V 2016 server. The physical machine has 6 network ports. I read that it is best practice to have one network port dedicated to remote management of the Hyper-V Host, so ...
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1answer
935 views

Change External NIC to Public on Windows Server 2016

I've got a cloud network: 192.168.100.0/24 with: Pfsense GW (IPSec site-to-site) NIC1 = WAN-IP1 (fully blocked except IPSec) NIC2 = 192.168.100.1 DC (WinServer2016) NIC1 = WAN-IP2 (external) ...
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133 views

Windows Server 2016 - Multiple NICs - Isolation Issue?

I have a SCADA server running Windows Server 2016 with 2 NICs configured to grant access to separate networks, which I need to stay isolated from each other. NIC 1 exists on the main local network ...
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111 views

Why does my Realtek gigabit NIC not advertise 1000Mbit mode?

I currently have a NAS (openmediavault based on debian) with a Realtek gigabit NIC (ASRock Q1900-ITX on-board LAN), but it won't advertise that it is gigabit-capable. ethtool eth0 gives the following ...
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71 views

Default gateway settings on DHCP NIC

I'm kinda new in the Server world. I have a Windows Server with two NICs, one for internet and one for DHCP on the LAN - however, the second NIC shows up as "unidentified network" and I cant change ...
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1answer
71 views

NIC suddenly doesn't recognize cable

I have a server lab with an ASROCK motherboard. Built this server about 6 months ago. Today, while working on it, the NIC Local Area Connection (Ethernet) suddenly showed that the cable is unplugged....
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43 views

Connect to sshd over direct link to second NIC

This is how things are by default. I did not set anything up. My debian server has a network connection on eno2 with ip 192.168.1.40. Internet, sshd, Everything works fine. Now I've added a second ...
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3answers
1k views

Multiport Server NIC ports?

I need to buy multiport NIC, because I need to replace 4 NIC with one. For example they are: https://www.amazon.com/HP-NC364T-Gigabit-Server-Adptr/dp/B000P0NX3G https://www.amazon.com/Intel-1000-...
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139 views

What do the numbers in square brackets of ethtool output mean?

I'm looking at NIC statistics and can't find any info about these numbers: [0],[1]..[7] like here: [root@machine-1 ~]# ethtool -S enp21s0f0 NIC statistics: [0]: rx_bytes: 23048043995115 [0]:...
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1answer
61 views

Does it make sense to use dynamic mode with switch depentent mode?

According to the NIC teaming tutorial of itfreetraining on youtube, in the NIC teaming mode "dynamic", outbound traffic is distributed among the team members using the address hash method and inbound ...
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1answer
50 views

Right network interface autodetect and get dhcp while boot

While preparing the mini forensic system I hung on a problem: Let us imagine, we prepare a usb-flash booted linux for lot of diferent workstations. While setting up the network (ipv4 dhcp) we can find ...
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84 views

Centos 7 with two NIC cards getting random availability after reboot

I have a Centos 7 installed on vSphere with two Nic (eth0 and eth1) eth0 - 10.10.1.1 eth2 - 192.168.1.1 both IP assigned by DHCP. When reboot server first time - eth0 (10.10.1.1) is responding for ...
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1answer
70 views

when should I raise an alarm if I see dropped packets ( packet_in or packet_out)

I am trying to create a simple anomaly alarm detection by looking at the KPI of my Linux servers. I was wondering when should I flag an alarm if see dropped packets ( both packet_in and/or packet_out)....
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1answer
119 views

Intel Network Card on Linux server - limited performance despite bonding ports

I took over a Debian 7 server with an Intel NIC where the ports are bonded together for load balancing. This is the hardware: lspci -vvv | egrep -i 'network|ethernet' 04:00.0 Ethernet controller: ...
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1answer
328 views

Emulate/Pass-through Physical NIC on Hyper-V Server 2012 R2 for VM

We recently re-did a client's server and set it up as a VM. However, they use a license server for one of their products and the license server doesn't work on a VM. I asked their support team as to ...
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2answers
61 views

How does the host OS process frames/packets meant for VMs?

I've been reading up on how VMs communicate on the internet using vNICs, vSwitches etc. Would like to confirm a few things For outbound traffic, the pNIC can be overridden send frames/packets with ip/...
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2answers
497 views

How do I prepare for swapping a NIC using network teaming on a Windows cluster host?

Update: I have now performed the upgrade. I used the half-ninja, half-hack solution of plugging in USB-to-Ethernet adapters that I could add to the teams to hold the fort. I plugged in one per team, ...
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1answer
718 views

Two ip address on one NIC

I am trying to get two external ip addresses(both ip assigned by DHCP) on single NIC. I added one macvlan device vir1 with its own mac address bounded to the primary NIC eth0. Set eth0 to promiscuous ...
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580 views

Unidentified network with VIRTIO NIC Drivers after system reboot

I have KVM with VIRTIO network interface. It runs under Windows Server 2012 R2 so I installed RedHat network virtio drivers. It runs properly but after system reboot internet connection is lost. ...