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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How to bond NIC on a virtual machine?

I'm puzzled about this process. Historically when I've setup an LACP bond on a piece of physical hardware I have to create the analogous setup on the switch. How does this work with a virtual machine ...
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2k views

Netsh Dump missing DNS settings

I'm trying to figure out why "netsh dump" produces different scripts on 2003 versus 2008. In output below, I've used "netsh interface ip dump" to keep the length of this post reasonable. I've searched ...
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204 views

How does a NIC send a hardware interrupt? [closed]

Some context. A few weeks ago, a NIC was replaced on a box without much troubleshooting to find a clear resolution to the problem. A senior administrator got into a small tiff with an entry-level ...
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1answer
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 ...
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4k views

Finding NIC firmware version

I need to find out the firmware version of the NIC(s) on on IBM Windows Server 2008 using CMD, Powershell or by any other means.I also should note that I can't reboot the server to go to bios or use ...
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4k views

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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239 views

Centos 6.4 2 NIC same gateway

I'm having a problem with my centos server setup, i have 2 public nic and they have the ip from 209.59.252.0/24, with the same gateway. The problem is that only eth0 works, the other one doesn't. They ...
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64 views

What difference between HP and Intel network adapter, both using an Intel controller?

For example, the network adapter HP NC360T PCI card uses the Intel 82571EB controller. So, what exactly is the difference between an Intel "fully" branded card, and a HP branded card having an Intel ...
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824 views

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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310 views

Hosting multiple socks proxies on a single server

I have multiple public IP addresses assigned to a single NIC in a Windows Server 2012. I want to be able to use each IP as a socks proxy server which has to be accessible from other Internet users. ...
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616 views

Two NIC card with same mac address

Yes its very strange but I have got two server having same H/W MAC address. The issue which I am facing is again very strange. 1st Server is normal windows server. 2nd Server is running KVM on ...
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380 views

CentOS: network adapter reset - error reading PHY register

I have a problem with a server. The following is written in the /var/log/messages error log: Aug 15 10:22:46 s00000000 kernel: ------------[ cut here ]------------ Aug 15 10:22:46 s00000000 ...
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135 views

Login script not running as the NIC takes too long to initialise

We're just about to roll out a bunch of Lenovo T431s's but have an odd problem with the NICs on them. Basically (from reboot) they are taking too long to initialise (i.e. the blue "swirl" on the ...
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3answers
4k views

Is APC's smart-signaling cable (940-0024) really proprietary?

First, not sure if this question belongs here or SU, so please advice accordingly before wildly down-voting or blasting me. We have a UPS unit for which we recently configured to work on our network. ...
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2answers
1k views

Broadcom Advanced Control Suite 4 on a PowerConnect 2848 making router (ASA5505) throw ARP errors when TEAMING (different MAC addresses from same IP)

For some reason the Broadcom Advanced Control Suite 4 seems to be a little buggy OR I have not configured something correctly. I have 4 Gb NICs and I team 3 of them to make a virtual adaptor... ...
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2answers
3k views

Running an EC2 server on Ubuntu with 2 simultaneous network interfaces

I have found similar questions relating to this issue but none matching my situation and none of the advice has helped me get this running. I have a 64bit Ubuntu server from the default AMI running ...
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989 views

A duplicate name has been detected on the TCP network

I installed my domain controller and DNS with two NIC on the server. Both NICs have their own separate IP addresses in the same subnet and were not teamed. Both IP address were registered in the DNS ...
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1answer
168 views

Storage Network Stops Transmitting Traffic

I have a troublesome issue. I have a 10Gb storage network serving a VMWare vSphere 5.1 environment. Storage: TrueNAS(NFS) with a Chelseio T320 10Gb Nic Storage: Dell PowerVault MD3600i(iSCSI) ...
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165 views

Accessing the internet (or other network) via server with two NICs

I currently have the following setup whereby I need Server #1 to reach the Internet via Server #2 using its second NIC. Is this possible using static routes? If so which route should be added to ...
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185 views

Secondary “Management” NIC on SBS 2011?

Looking for a solution to an issue I've run into at a site. Essentially we've run out of network drops for a server. The server itself has all of the necessary network drops, but we do not have one ...
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1answer
78 views

Multiple webservers behind firewall done correctly?

Basiclly I have a firewall and behind it i have a webserver which is a webportal for clients, a second webserver that hosts their webpages and a DNS server I want to route the traffic through that ...
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2answers
2k views

Need to configure 2008 server with 2 NICs on different subnets

I am working on an application that requires a 2008 server to have 2 NICs for security purposes. NIC 1 will be connected to the customer's enterprise network with a static IP and is routable. It ...
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80 views

Two Nics, one direct connection and forwarding

I'm designing a system with a Server PC with two nics running Centos 6 and a Sensor Device which runs a web server. The Sensor Device is connected directly to one of the nics of the Server PC. All ...
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1answer
195 views

Layer 2 Load-Balancing on redundant Architecture

Some PCs with 2 NICs are bound on 2 Switches in order to avoid a Single-Point-of-Failure (the switches are interconnected to each other too). Under which cirumstances is it possible that the PCs can ...
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55 views

if there are 2 NIC on the same machine, can a tcp client on one NIC connect to a tcp server on the other NIC?

I use tun/tap to create a tun NIC tun0 with IP 10.10.10.2, and I have a real NIC eth0 with IP 202.112.34.49 then I run a tcp client which binds its socket to 202.112.34.49 and a tcp server binding ...
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223 views

How to block outgoing traffic of the mac address of one of the server's own NIC with ip tables?

i have a server with 5 nics connected to a switch, and running GNS3 (cisco router emulator). I need to block, in the server, the packets originated by the nics at layer 2 level (the nics are not ...
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103 views

Do I need 2 NIC cards to forward public IP to private IP? [closed]

To use NAT do I need 2 nic cards? I want to use my server for my own business (I don't require VPN) and simply need to forward my public IP to the private IP so that websites show up as ...
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3answers
5k views

Why did robocopy cause my Windows 2012 server to hang last night?

I'm in the process of decommissioning an old 2003 server, which acts as a file server, and am just attempting a dry-run of migrating the file repository over to a new Windows Storage Server 2012 box. ...
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1answer
809 views

FreeBSD Nic Setup - Dual NICs with lagg

I have a server running FreeBSD 9.0. It has two NICs using the igb network drivers. I was given a range of IPs, for example's sake I'm just going to make up some IP addresses, so let's say ...
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82 views

SetFTP access to 2nd nic

I have a situation where we have our main LAN/Domain that all users connect to and provides access to the WEB. We have a couple of individuals who on occasion will begin an extended FTP download, ...
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1answer
8k 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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947 views

VSphere 5.1 DHCP Server VM routing

I am trying to setup the routing for a VM that is my firewall/dhcp server. I have 3 VMs: router/firewall (centOS) -> VM1 unRAID(unraid) -> VM2 download-server(ubuntu server) -> VM3 2 NICs vmnic0 ...
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886 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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211 views

How to “dedicate” a 2nd NIC correctly without provoking a storm?

Some parts / aspects of this topic have been discussed here before. Leading up to my question: eth0 is the official nic of my ubuntu 12.04-server eth1 is the "local=yes" port of bridge 'br1' ...
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338 views

Server 2008 on VMware vSphere 5.1 - nic takes 20-25 mins to connect to the network

I have VM with Server 2008 R2 on it that I just recently installed Exchange 2010 on. It has been working 100% till today. This morning I installed ESET (antivirus) on the machine and then this ...
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106 views

Difference between GBIC and SFP [closed]

What is the difference between GBIC, SFP, SFP+?
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90 views

Giving Multiple ip address of same n/w on two virtual nic

running xen with 2 guests i have been trying to assign public ip addresses to two virtual nic, one each which is sharing bridge networking with host. tried this Host x.x.116.2 created two nic ...
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565 views

How do I create a Debian netinst installer that has a 3rd party network driver?

I want to install Debian on a machine, but the kernel and modules in the squeeze netinst module do not support the network driver. I can build a kernel module that works, but: How do I get the same ...
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523 views

Dell r900 and SFP+ HBA

I'm trying to pair up the parts and pieces to get an already purchased Dell Equallogic PS6010E going, with a couple existing Dell r900 servers for ESXi 5.0,and keep running into show-stoppers. The ...
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1answer
22 views

Protocol moves to another ethx Suse

I have a server which has 2 nics eth0 and eth1 eth0 is used for our email traffic server. everything working fine some time later a eth1 was added for backup purposes so this new nic sends data to ...
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608 views

routing internet via WLAN, but still connect to local LAN

I have 5 computers which are normally connected to an LAN, which is connected to internet access. However, rarely the internet provider has a fault and this causes the LAN to lose internet ...
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943 views

FTP Error 500 Illegal Port Command - PORT command sending different IP than source of request

The problem I'm experiencing is that I'm getting a "500 Illegal PORT command" Response from an FTP server when attempting to upload a file programmatically. This program is a small c# application ...
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237 views

linux ethernet card ping problems?

I have a very strange problem with my ethernet card. Here is ethernet card details: description: Ethernet interface product: RTL8169 PCI Gigabit Ethernet Controller vendor: Realtek ...
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1answer
84 views

Added a new NIC, can't reach any devices off the interface (ubuntu)

I was wondering if anyone could help me narrow this problem I have a gateway running Ubuntu server 10.04 (LTS) and I have added a new NIC to it which is a Intel PRO 1000PT GbE, bringing the ...
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782 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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209 views

Static route to all ips except a defined set

I was wondering whats the best way to do a static route for all ips except a predefined set. For example, I have 2 networks attached to one workstation. I want all ips except 192.168.0.0/24 to go ...
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1answer
58 views

Specify what network connection to use based on IP being accessed [closed]

Basically, we have a number of machines with two network cards. One is wireless, one is not. The wireless is connected to the internet, while the other one is connected to a route and a bunch of ...
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187 views

How do I calculate the ethernet NIC-to-NIC time to send a MTU packet (1500 bytes)? (OS-excluded) [closed]

I understand it will depend on the speed of the ethernet 10 Mbit to 100 Gbit. Given an ethernet speed, how do I calculate the time spend in the wire from NIC-to-NIC? I am assuming here that the ...
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1answer
282 views

Additional external IP address is not reachable when acitvating NAT

I am running a Windows Server 2008 R2 with 3 nics (2 with external IPs, 1 with internal IP). The two external IPs are associated with two web sites running on that server. The third nic is for ...
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110 views

Installing ESXi/ Hyper-V using NIC supporting iBFT

We can install ESXi to a iSCSI target if we have NIC that supports iBFT. But what I am trying to see is if we can install ESXi by booting off an iSCSI target which is a mounted ISO? How about Hyper-V ...