Questions tagged [ethernet]
Ethernet is the most common set of standards for wired connections in local area networks.
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Network fails when workstation powered off
I have a network of about 50 PC's connected through an HP Proliant switch, with Cisco routers. There are 4 workstations that exhibit some very strange behavior. When you power any one of the computers ...
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switch or other device?
i want to get a network device working as a multiplexer.
for example, only the data sent to port A would be forwarded to port B completely.
and the data of port B have to be forwarded to port A also....
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What is the difference between a hub and a switch?
I'm sneeking around online store for used stock of hubs, routers and switches for a project I have to build a network infrastructure.
So far, I have bought:
1x Cisco 2514 Router;
5x Cisco Serial ...
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Ethernet Frames and CSMA/CD [closed]
I'm learning about Ethernet and I'm wondering if with several stations within the same Ethernet collision domain like pictured below, is it possible that a frame sent by station A is fully received by ...
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Dell PowerConnect Console connection via Ethernet
When you buy a Dell PowerConnect (In my case it's a 5548) you are given a console cable that is serial to ethernet. Let's say you don't have a serial port on your laptop and but you still want to run ...
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Can a host launch a DOS attack on Ethernet?
Here is my trail of thought:
Since Ethernet works on the principle of CSMA/CD one can possible setup a rogue host which transmits packets all the time forcing other to exponentially back off until ...
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Dangers of using computers as wireless access points?
My workplace's wifi setup isn't the best - each of our two floors only has one access point. Naturally, the wifi has a tendency to get really slow (I've seen it at 300 Kb/s), so we've given every ...
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What do I request from the LAN upgrade contractor to avoid simple oversights? [closed]
The company for which I work have allowed me to hire a LAN wiring contractor to completely overhaul the building LAN. Currently there are old 10MBit Ethernet cables and switches running and I ...
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CAT5e RJ45 splitter with CAT6 network: compatibility & performance
I need to connect 2 PCs on a single RJ45 socket on the wall. The network is wired with CAT6 cables.
I have seen a few RJ45 splitters that seem to do just that, but they are all for CAT5e cables. Here ...
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HOWTO: Ring Ethernet Lan, My drawing Correct?
I have a special demand that to improve the redundancy of a network. (any of the cable between switches broken will NOT disconnect any clients)
S = a switch C = a computer - = CAT5 cable
...
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Will 1000BASE-LX autonegotiate to work with 100BASE-FX
We have existing equipment that uses 100BASE-FX (multi-mode fiber). Will it work with 1000BASE-LX (also multi-mode) through autonegotiation? Virtually everything I found on the web about ...
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Ubuntu Server - Two Interfaces Living Together (in perfect harmony)
Our server has three ethernet interfaces. I have one plugged into the cable modem (for static ip), and one plugged into the router (for access to the rest of the work network). I'm pretty sure that I ...
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Are there any types of switches that allow you to set custom network speed on their ports? [closed]
I know there are managed switches out there that allow you to hardcode the speed of their ports to 10/100/1000 Mb per second. But what if I want to set the speed to only 1 Mb per second or perhaps ...
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How to run 5 php processes, which uses different eth interfaces?
I'm using cron to run everyday script, which has to run 5 php-cli processes. I need them to use separate interfaces.
I have 5 devices, eth0, eth1, eth2, eth3, eth4.
How can I call php to make sure ...
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Cluster computing over Wifi
I was recently reading about Cluster Computing and how it used Ethernet as preferred interface. My question is why not use WiFi? It has a 300Mbps (802.11n) throughput and without all the wiring ...
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patch panels... or directly to the switch?
does it make a difference in terms of signal quality if I connect the Ethernet cabling:
from the wall-plugs to the patch-panel and from the patch-panel to the switch with a cord.
as opposed to:
...
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Windows: How to know which client is connected to the other end of the cable, by looking at this end of it?
I have a bunch of cables disconnected from a faulty network switch.
What is the fastest way to determine which cable goes to which client PC (windows) / server (windows) / other devices etc..
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Simple way to make wired internet wireless without router [closed]
Is there any device which you can plug into an Ethernet port and then have it broadcast the internet connection it receives through Ethernet wirelessly with a set password (maybe a serial number on ...
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How to maximise performance in computers connected into LAN via Gigabit ethernet router?
Our group is setting up a server (which might just be a NAS, but we're not sure yet), which shares files, so that it connects to all other computers in the room (about 10 of them). I am thinking just ...
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Design for wire between server and access point and RF to endpoint device
We're about to design an inhouse industry network consisting basically of the following: 1 server connected via wire to up to 100 proprietary RF access points (basically embedded devices), which each ...
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Gateway with multiple VLAN IPs on one NIC
I would like to separate several hosts from the local network and put them behind a firewall. I would like to use VLANs to "physically" separate them instead of using just different subnets. ...
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Why do my P.L.Cs (Power line converters) devide the speed by two?
If I directly connect to my 100MB router with a CAT.5e cable, I get these results :
$ speedtest --simple
Ping: 8.617 ms
Download: 92.54 Mbit/s
Upload: 93.90 Mbit/s
$ ethtool eth0
Settings for eth0:
...
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Can I use Cat6 and Cat5e female jacks together?
Having one on each end, as long as I use the same color code for both?
for some reason it's not working, both jacks have different A and B codes, but I just used the same on both being:
Left column:
...
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NIC seems slow, even on 100Mb/s full duplex [closed]
So I have a server running Centos 6 64bit with cPanel. It's set on eth0 running at 100MB/s full duplex. But, one particular server seems sluggish on its connectivity, despite server load being minimal ...
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Is it possible to tell whether I am connecting to fast or gigabit ethernet with CAT5e cable?
My NIC supports gigabit ethernet:
$ ethtool eth0
Settings for eth0:
Supported ports: [ MII ]
Supported link modes: 10baseT/Half 10baseT/Full
...
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Would faulty wiring let you access the internet but fail to let you find a domain controller on the LAN?
I have been having a random issue regarding joining a domain at my workplace. II am a programmer, not a network tech, so I struggle with these issues and would like my suspicion confirmed
In this ...
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How to build a L2 Ethernet with 1000 comupters?
We don't really have 1000 computers. I'm asking this question just because my brain is blocked here.
If I put a number of, say 1000, computer on a L2 Ethernet. Since most of L2 switch has only maybe ...
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2 networks with a layer 2 bridge that shouldn't be there.
I have 2 separate networks that I manage. They have a router between and layer 3 connection is working fine. Last week my DHCP servers started handing out IPs across the networks, looking around I ...
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isdn s/t vs ethernet vs adsloisdn
On the back of my cisco router, I see the following ports:
4 LAN ports
ISDN S/T
ADSLoISDN
Console
Two really basic questions:
1) Is the ISDN S/T port like any other WAN ethernet port? (i.e. can I ...
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Ubuntu is showing weird HWAddress for eth0 after a power failure
Recently, my ubuntu box encountered a power failure. After rebooting, the HWAddress of eth0 is showing a very weird number: 00:00:00:00:00:30. I have tried sudo ifconfig eth0 down & sudo ifconfig ...
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Is there a way to configure port security on Linux bridge?
On switches there is such a feature as Port Security. Roughly speaking it allows to control, which exactly MAC's can be on the specific switch port. You can restrict it to just one MAC or several, and ...
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Ethernet Cable Broken [closed]
Hi I have a 15m ethernet cable going under my floor from the front to back of house.
It has developed a fault and pins 1 & 6 are no longer connected (I've tested it).
Given getting it back up or ...
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2+ PORT NIC Explained
I am very confused about two or more port network interface cards (NICs).
Does having 2 port on a NIC allow you to have 2 network interfaces? If I go to ifconfig will it list each port as a separate ...
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Bonding 4 Gigabit ethernet and 2 Fiber SFP+
We received a DL380 with 4 Gigabit Ethernet (normal CAT6), and 2 Fiber SFP+ (HPE 10Gb SR SPF+). I've successfully managed to bond the 4 Gigabit Ethernet together, and put in place some LACP on our ...
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Ethernet switch with Infiniband uplink
There are Ethernet switches (copper based, i.e. with RJ45 sockets) that have Fibre uplink. Example: Netgear GS110TP
Are there any such switches with Infiniband uplinks? If not then why?
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Powering a Patch Panel [closed]
So I'm in the process of replacing all the telephone wall plates with ethernet plates so I will have the choice to hardwire to the internet from any room if I so desire. right now I have my internet ...
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1 Gig LAN transfer speed on 12 MB/s
I'm transfering files between 2 linux servers on the same network.
This is the Network configuration on both of them:
server 1:
Settings for eth0:
Supported ports: [ TP ]
Supported link ...
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Fibre Channel Adapter as a NIC?
Is it possible to use a Fibre Channel PCIe adapter as an Ethernet network interface? I have QLogic Fibre Channel controller and a 3Com Gigabit Ethernet switch. I use Debian on a DL160 G5.
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Router - huge difference in Tx vs. Rx
I have two computers:
(B) Banana Pi - 1 Gigabit Ethernet, Wi-Fi (supports 802.11n)
(D) Desktop PC - 1 Gigabit Ethernet, Wi-Fi (2x2 MIMO, supports 802.11n)
And (R) Mikrotik RouterBOARD RB951G-2HnD - ...
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Ethernet switch signal quality
Is there a (significant) signal quality difference between ethernet switches?
n other words:
A 1000base-t, do some switches allow longer cable runs than other switches?
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Calculating required uplink capacity of network switch [duplicate]
Is there any common method (usable in practice) for estimating the uplink capacity of switch based on known number of users connected to this switch and the maximum internet speed they are allowed.
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Multiple ethernet interface on one ethernet card
First I must say that I am new in linux and maybe I will ask trivial question.
My job is to create 8 ethernet interface to be visible in kernel, but all of them should send and receive data through ...
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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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Tools to inspect an ethernet packet travels through host's interfaces?
I am debugging a local ethernet connection on a Linux machine. I want to inspect the ethernet packets as they travel. in and out current machines' interfaces. I do not have a GUI on the machine. Is ...
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Redundant/Failover Ethernet Link from Windows Server to Switch
I'm trying to set up a redundant link from my Windows server (Dell R710 with 4 GigE ports) to my Cisco switch. I'd like to "failover" in case the first Ethernet link fails (e.g. NIC issue, cable issue)...
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How are you suppose to NAT with snow leopard server mini with only 1 ethernet port?
How are you suppose to NAT with snow leopard server mini with only 1 ethernet port?
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Recommendation for Ethernet switches that allow arbitrary network topologies [closed]
We have the following requirements for three Ethernet switches that will be connected together:
Allow the switches to connect together to form dynamic, arbitrary topologies, i.e., support for the ...
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GigE ethernet switch backplane bandwidth
While looking for a 16- or 24-port gigabit ethernet switch with at least 6 VLANs and port mirroring (packet duplication to a monitoring port), I came up with three candidates (there are more): Cisco ...
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How many hardware (PCI-MSI) interrupts can a PC have?
On my workstation I got only two PCI-MSI interrupts in /proc/interrupts:
0: 11726919 0 IO-APIC-edge timer
1: 3 0 IO-APIC-edge i8042
7: 0 0 ...
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Can't get an Internet connection on VmWare
I'm running openSuse 11.1 on VmWare and I can't get on internet.
I'm at home, no ports blocked or anything, I've tried every single ethernet option, nothing works.
Can anybody point me at settings I ...
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