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42 votes
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e1000e Reset adapter unexpectedly / Detected Hardware Unit Hang

Ok so after posting this question last night night I continued to do some research the only real solution I came across seems to have taken care of the problem. Disabling TSO, GSO and GRO using ...
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  • 2,175
18 votes

how to tell if NIC has multiqueue enabled?

ethtool -l <interface> will display the status of queues associated with an interface, if that interface's driver supports such a thing. In ethtool-land, multiqueue is indicated by "channels". ...
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15 votes

Multiport Server NIC ports?

These devices are typically seen in the OS as four separate network devices and they can be used just like the four separate NICs you had before.
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  • 97k
14 votes

When using nmcli, what is considered a device, an interface and a connection? What's the difference?

A "network device" (in the context of a computer) typically refers to a piece of hardware - the network interface card (NIC). Once upon a time, back when dinosaurs roamed the internet and lots of ...
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13 votes
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eth0 NIC Link is Down repeating message in kernel log

check for errors on the wire, look at the "errors" field in the output of ifconfig. If non-zero then there are problems with hardware (cable, NIC card, or hub/switch). An unreliable Ethernet cable ...
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13 votes
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Are transceivers hot swappable?

Yes, they're completely hot-swappable. Think of them the same way as cables (note the link lights). Same for SFP+ direct-attach cables. It wouldn't make sense for them not to be hot-swappable. Heck, ...
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12 votes
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What fiber optic network interface card do I need for a WAN connection

You don't want to buy a "fiber card". What you want is a card (or preferably a switch) that has either SFP or SFP+ ports. This will allow you to purchase cheap optics depending on what you need, and ...
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  • 108k
11 votes
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Hyper-V cannot ping VM from host

Long story short: remove the virtual switch from Hyper-V, recreate it, and everything worked again...
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  • 519
9 votes

e1000e Reset adapter unexpectedly / Detected Hardware Unit Hang

Disabling Enhanced C1 (C1E) in the BIOS fixed it for me. Not sure if the lower power state of C1E is messing with the driver, or that there's an oops in the driver when the processor is in this state....
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  • 91
7 votes

multiple physical interfaces with IPs on the same subnet

You more likely want to create a bridge with the 8/9 interfaces and then assign an IP address to that bridge (bridge-utils packet, command 'brctl add'). This way the bridge will act like as a switch ...
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  • 71
7 votes

Are transceivers hot swappable?

Generally yes they are, certainly I've never come across any that weren't - in particular I know for a fact that the top three on your list are, not used the bottom one so can't say with the same ...
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  • 100k
7 votes
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How do I increase the ring parameters for a NIC on a Linux server

Well, there's the example of the pre-set maximum ring buffer figures on Broadcom bnx2 devices being modified in the kernel from 1020 to 2040 a few years ago, so it is possible. diff --git a/drivers/...
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  • 195k
7 votes

How can I configure each Windows user to have unique ip address

Under the assumption you are talking about users using Remote Desktop Services. Windows Server 2008 R2 has a feature called Remote Desktop IP Virtualization and comes with the Remote Desktop Server ...
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  • 1,483
6 votes

e1000e Reset adapter unexpectedly / Detected Hardware Unit Hang

Disabling only TCP Segmentation Offload (TSO) does the trick for me. ethtool -K eth0 tso off Note: It does not seem to be necessary to also disable Generic Receive Offload (GRO) and Generic ...
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5 votes

Put NIC under heavy load

You should examine/post any errors you've received... Why do you suspect you have a problem? What behaviors have you seen on the system. And you should definitely have multiple NICs available for ...
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  • 195k
5 votes
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How can I confirm if my vmxnet driver is installed on my CentOS server?

In Red Hat 5 and CentOS 5, you need to install VMware Tools, because the vmware modules aren't include the main line kernel. For example, in SUSE 11 Sp1 with kernel 2.6.32.59-0.7-default: grep -i ...
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  • 5,129
5 votes

Any 3 port NIC's made?

You can use a single port NIC and a dual-port NIC... or just use a 4-port card. There's no real history of 3-port network add-in cards. I'm sure you can find something available in your price range. ...
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  • 195k
5 votes
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How do I prepare for swapping a NIC using network teaming on a Windows cluster host?

This is an important question and I'd say a more common scenario than it appears from your searching. As you may know there are three types of teaming provided by MS Server. 1. Active / Standby 2....
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  • 166
5 votes

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

Yes. Yes. Yes. It can be but doesn't by default. When the packet arrives its destination is evaluated by its internal virtual switch to decide which VMs to send it to or if it's for its own kernel.
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  • 100k
5 votes

Multiport Server NIC ports?

As others have already mentioned, yes, a 4-port network card will be recognized and usable just like 4 separate network interfaces. However, in particular with 4-port cards, you should pay attention ...
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  • 4,113
4 votes
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Are Add-On 10gb Nics Legit?

Normally we don't do product recommendation-like questions here but this is an easy one. They're both 1 Gbps NICs, not 10Gbps models - no idea why they're listed that way but even the most cursory ...
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  • 100k
4 votes
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How can I stop Azure from randomly replacing network cards on VMs?

Nope, no can do on this, so anything depending on MAC address licensing or PTR records is something you would want to avoid if you're considering Azure.
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  • 3,829
4 votes
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Supermicro NICs gone after BIOS update

Final solution was resetting the BIOS settings to "Fail-Safe Defaults" as suggested by Brian.
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4 votes
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Select source IP on windows server 2012 with multiple IPs on 1 NIC

The command you need is as follows: route add 196.232.5.228 mask 255.255.255.255 192.168.x.x 192.168.100.146 Where 192.168.x.x is the default gateway on your network. This command is adding a route ...
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  • 404
4 votes

NIC seems slow, even on 100Mb/s full duplex

As Rex mentioned, the difference there is in bits versus bytes. MB is megabytes, and Mb is megabits. Network speeds are almost always measured in bits. The 10 MB/s performance you're seeing is ...
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  • 75
4 votes

Multiple Nics, multiple default gateways on a Server 2012R2 cluster

For every network that the cluster members have in common (having a NIC in the same subnet), the cluster will create a cluster network and enable cluster communication for that cluster network (...
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  • 108k
4 votes
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Select IP's from two or more subnets

No, your gateway needs to be in the same subnet as your host address, as that's the machine you contact to get out of your subnet (it's a router). You can have multiple subnets on the same fabric and ...
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  • 7,001
4 votes

Hyper-V cannot ping VM from host

reason is!!Firewall!! Disable Firewall, or to be specific in the firewall settings, allow bellow app to communicate through fire wall and issue will be resolved: File and Printer Sharing (ICMS)
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4 votes
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Distribute VM and force new mac address

The canonical "correct" way to distribute VM images for VMware vSphere is to distribute .ova files created using ovftool, and then use the vSphere GUI to install the .ova file. This automatically ...
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4 votes

What fiber optic network interface card do I need for a WAN connection

You need to find out what standard your ISP is using before you can start shopping for hardware to connect to it. IF it's a fiber ethernet variant then you can use a network card with a SFP/SFP+ slot ...
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