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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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Why does 1GBit card have output limited to 80 MiB?

I'm trying to utilize maximal bandwidth provided by my 1GiB network card, but it's always limited to 80MiB (real megabytes). What can be the reason? Card description (lshw output): description: Ethernet interface product: DGE-530T Gigabit…
ctinnist
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ethernet smp_affinity vs /proc/interrupts vs /sys/class/net/ethX/device

My goal is to configure our CentOS ("free" RHEL) 5.x servers for custom low-latency network programs. I would like to experiment with binding ethernet NIC interrupt handling to the same CPU on which the program runs (to hopefully improve cache…
Matt
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Ethernet Loopback plug - running a ping

For a project at work, I need to be able to test various Ethernet NICs by connecting them to a "loopback adapter plug", like this one on various embedded Linux boxen that come off a production assembly line. I'd like to be able to setup two…
J. Polfer
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Is it possible to use ebtables to filter traffic by MAC-addresses on simple ethernet interface, without bridging?

I have a linux machine (my workstation). From there I can ping other local machines, let's say 192.168.1.22. Let's say I want to prohibit communication with 192.168.1.22 by it's MAC address. I'm trying a simple rule: ebtables -I INPUT -s…
thor
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Why ethernet cables must be ended with specific arrangement

I just accepted that ethernet cables CAT 5 and more must be ended with specific arrangement. I learned when I ending my cables to take attention that either end must be in same arrangement(568A or 568B ). Sometime I get stacked with my fellow…
adopilot
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Why do partially failed/failing switches fail to pass DHCP?

I've noticed this several times: a switch starts to behave oddly. Usually if the switch doesn't fail outright, what tends to get noticed is that DHCP doesn't work. We had a Linksys SRW-224P fail today. Systems which were still connected worked…
David Mackintosh
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Are there any statistics on the number of networks using Ethernet Jumbo frames?

I am often told by Sales Engineers and Product managers that a Layer 2 Ethernet service is not fit for purpose if the maximum supported frame size is in the 1518-1522 range (enough to support standard Ethernet frames or VLAN tagged frames). Or in…
Russell Heilling
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Can tone ethernet cable into patch panel but it's not working

So we recently had to two major issues happen at a location. We had a lightning strike hit the building We updated switches after this lightning strike Now one thing that was 'hit' was a SOHO router. After upgrading the server room, we realized…
HeyHelpDeskGuy
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Why does the TCP Chimney Offload feature on some ethernet cards fail to pass some network packets to the OS?

In http://support.microsoft.com/kb/942861 Microsoft reports that in some situations Microsoft SQL Server experiences network issues due to the network card having a TCP Chimney Offload turned on. I have other server software that is experiencing…
Aaron K
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Is it safe to connect a PoE injector switch to an ordinary PC?

Is it safe to connect a 24 V PoE switch output to an ordinary PC Ethernet input?
Toni Homedes i Saun
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100BASE-FX WDM vs 100BASE-BX vs 100BASE-BX10 - Are they all the same?

Are these three all the same thing being inconsistently named by different manufacturers? 100BASE-FX WDM uses separate wavelengths (1310 nm & 1550 nm) for Tx & Rx over a single strand of fiber. I cannot find any documentation for 100BASE-FX that…
Monstieur
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How to dynamically find the name and type of interfaces attached to a system

I have a use case where I need to dynamically configure some files which includes the name of the interfaces present in system say eth0 , wlan0 . However when I change the system sometimes its changed to eth1 or wlan1 . From Ubuntu 14.04 the…
Ankit Kulkarni
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Virtual interfaces with different MAC addresses

I try to figure out how to set up two logical network interfaces (at one physical interface) with separate MAC addresses on a Linux machine. My first attempt was to use macvlan which seemed to work at first: [root@localhost ~]# ip link add link…
chwon
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What does 'Si' mean with respect to network switches?

I am seeing references to Multilayer Switches with Si as in the network symbol below. What does the 'with Si' qualifier mean?
andand
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Connect two networks to a single server using its two ethernet ports

I have two separated local networks (two routers, each is connected to its ISP for the internet connection) and a server with two ethernet ports. The server is running a local website service which I would like both networks to be able to…
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