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Questions tagged [ethernet]

Ethernet is the most common set of standards for wired connections in local area networks.

Ethernet is the most common set of standards for wired connections in local area networks.

Originally designed in the 1970s, Ethernet had a data rate of 10 megabits per second. Later, Ethernet was extended to support rates of 100 megabits/second, 1 gigabit/second, 10 gigabits/second and 100 gigabits/second.

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Gigabit uplink versus regular switch port

I have a 10/100/1000 24-port + 2 mini-GBIC ports switch which I have to link to other switches. Unfortunately, on the other switch all the mini-GBIC slots are taken up, so all I can do is link them together using a regular Ethernet port (which is…
heroes222
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Is it possible to detect rx+ rx- tx+ tx- wires with multimeter?

Is it possible to detect rx+ rx- tx+ tx- wires of an ethernet cable having only a part of cable with multimeter or somehow else? I mean the situation when you have just one side of the ethernet cable. The other side is connected to a working switch…
POMATu
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How does a NIC send a hardware interrupt?

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 admin concerning hardware interrupts and ethernet…
barix
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Is it possible to use WPA2 over ethernet?

Like, as in requesting a "password" to connect, just wondering. Also, are any of these (VPN, public key auth?) methods either possible or implemented?
ppp
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Why do metal fasteners (e.g., staples) around ethernet cables impair network performance?

At one point I was living in a 6 bedroom home that had cat 6 ethernet wired to each bedroom. The internet connection to the bedrooms furthest from the cable modem had terrible performance, though I don't remember exactly what the symptoms were. …
drs
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Packet drops after configuring Ethernet Bonding

I am trying to configure Ethernet bonding for our servers . Both the Ethernet interface in my server are connected to two different network switches physically. Looks like my Ethernet bonding configuring is OK , but I am seeing packet loss after…
Zama Ques
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Can WireShark detect Ethernet PAUSE packets on network when running on Windows?

We have a Windows server which is connected to a switch processing a large quantity of data. We noticed that when we disabled FlowControl on the network adapter, that it appeared that we were getting much better performance. We are occasionally…
Benjamin Peikes
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What does a magic packet look like?

What does a magic packet contain and what options does the protocol provide?
Sander Versluys
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Ubuntu Linux - two interfaces, same subnet, different vlan - MAC/ARP issues

I'm attempting to setup a server that needs to have interfaces on the same IP subnet, but different VLANs: eth1.102 Link encap:Ethernet HWaddr 00:50:56:b1:00:0f inet addr:10.1.1.6 Bcast:10.1.1.255 Mask:255.255.255.0 eth1.103 Link…
Andy Coates
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Phantom NIC issue causing eth0/1 to drop out

We are experiencing a very strange and frustrating problem. Our company has servers here in Massachusetts, as well as in California. The issues we are seeing are only on the CA hardware. Out in CA, we have several hundred Dell R300 and Dell R310…
Brendon Martino
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How can I reset the statistics reported by ifconfig?

I'm trying to trace a possible link problem on one of our servers' ethernet interfaces. ifconfig reports a large number of error packets. I've asked the hosting company to make some changes to the setup and would like to reset the interface counters…
Dave Cheney
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What is a good default IP address?

My company makes Ethernet devices. These devices have very little I/O. No keyboard, no video output. When the customer gets the device he must configure it for his network. I'd like to choose an IP address that won't conflict with an existing…
Robert Deml
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Expected throughput in Gigabit network

I've been doing some tests with iperf to measure the network throughput between 2 servers (connected back-to-back thru a crossover cable) and I only see 180 to 200 Mbps. I tried different cables and they're all CAT6. As you may know, iperf generates…
JFA
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What's better for performance: rack-to-endpoint or rack-to-switch-to-endpoint

When putting Ethernet cables for an office there are two ways to put the cables: From the rack patch panel a cable to each end-point (workstation). From the rack patch panel a cable to each room/floor switch, and from the switch another cable to…
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Hardware involved in Direct-connect (switchless) 2-node Storage Spaces Direct Cluster

For my department, I envision a two-node cluster of identical machines, running S2D. I want to use Broadcom 57416 10GBASE-T Adapters (example description), because they support RDMA and run at the speed of the free infrastructure provided by my…
Louis Waweru
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