A family of networking technologies for LANs. Ethernet encompasses bother the physical connection between devices and part of the protocols which define how the connected devices can communicate.

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100
votes
19answers
14k views

How do I physically prevent people from unplugging an Ethernet cable?

We have a crowded computer laboratory. We render free Ethernet ports for laptop users. But they don't carry their Ethernet cables with them, they unplug cable of a fixed desktop PC and plug it to ...
57
votes
11answers
8k views

How do I Connect a 30yr-old Tandy 1400LT laptop to the internet?

Just for the fun of it, I want to get an old Tandy 1400LT laptop: NEC V20 (Intel 8088 equivalent) 640 KB RAM 9'' CGA backlit monochrome display two 3,5'' 720KB DD floppy drives RS-232C serial port ...
53
votes
5answers
5k views

The locking clip/tab on my Ethernet cable's plug is broken. How can I fix it?

I have a 10 meter long Ethernet cable. One plug has the little locking clip missing, just like missing the part in red ellipse in the following picture. How can I fix it? Is this something I ...
30
votes
7answers
1k views

Why am I getting 950 Mbps up but only 360 Mbps down on Gigabit Ethernet?

I got two desktop computers talking to each other directly. They both have Gigabit Ethernet capable network adapters. That's 1 Gbps or 1000 Mbps. I have them connected with a brand new 10 meter long ...
26
votes
7answers
5k views

Ethernet cable too long?

I have an Ethernet cable running from a Huawei ADSL router to a computer> The total length is 61 meters (200 ft). When connected to the computer, a cycle of identifying, disconnected, identifying, ...
22
votes
6answers
4k views

Do cabled connections and Wi-Fi “use” the same bandwidth?

My brother likes to play games online on his Xbox. However, because he is far away from the router, he uses our Wi-Fi instead of an Ethernet cable. I, being closer to the router, use an Ethernet cable ...
20
votes
5answers
7k views

Does Ethernet over Power Lines work well for home networking?

I am considering putting a computer in my garage (geek alert) and my wireless signal is simply to weak to get through all of the concrete, steel, etc. I've seen products at Fry's for Ethernet over ...
17
votes
4answers
30k views

When concurrently connected to wired and wireless ensure Windows 7 uses wired connection

When I am at my desk and my laptop is in its docking station I want to ensure that it uses its wired connection and not my wireless network. I am hoping/guessing that the preference in connection is ...
17
votes
1answer
745 views

Looking for a fiber optic “switch” or “router” for home use

The gist of my question: What is a "fiber optic" switch called? I.E. a layer 2 ethernet switch that uses fiber TX and RX connections and sends layer 2 network traffic between the fiber strands ...
16
votes
5answers
6k views

Ethernet vs TCP vs IP?

What is the difference between Ethernet, TCP, and IP in simple (simple abstract) terms? Please do not copy from Wikipedia...
16
votes
6answers
1k views

Will the ethernet pull bandwidth if unplugged?

I'm fairly certain that this isn't a problem, but like a phone charger it will still pull electricity even though you aren't charging anything if you leave it plugged into the wall. Though minimal it ...
16
votes
7answers
37k views

How to Bridge Two Ethernet Ports on Mac OS X

How can I bridge two wired ethernet interfaces on Mac OS X (e.g. the current MacPro comes with two ethernet ports)? Googling turned up (e.g. this Apple forum post and this openvpn post) that this is ...
15
votes
6answers
2k views

Why does just splitting an Ethernet cable not work?

I thought the Ethernet is logically a one-line communication bus (for argument's sake, I am excluding hubs). All machines attached on the bus hears the same signals and the machines themselves try to ...
13
votes
5answers
43k views

Wireless vs. Wired: which is faster?

I have the option of hooking up my machines to the internet either wirelessly or via ethernet cable (wired). I'm curious as to which is faster; the approximate wireless signal strength (average) is ...
12
votes
3answers
61k views

Difference between Ethernet splitter and switch

I have one Ethernet port that is wired directly to the router on another level. However, I want to run a desktop and a server both off this one Ethernet port. Can anyone tell me the difference ...
12
votes
3answers
3k views

Will multiple switches slow transfer speed

I want to create link between a data server (It's more like NAS) and around 300 computers. Data transferred per day is around 2GB/computer and speed really matters. If I use a single switch it would ...
12
votes
10answers
22k views

Why do I only get 300-400 Mbit/s on my 1000 Mbit/s network?

My setup is like this: Laptop <--> Router <--> Desktop They all support gigabit Ethernet. I'm using the 'iperf' TCP/IP benchmark on the laptop and desktop, and I've never gotten more than 400 ...
12
votes
7answers
24k views

Why is my laptop favoring the wireless connection over my LAN connection?

When my laptop comes out of sleep, I have to typically wait about 90-120 seconds before my network (wireless or NIC card) 'wakes up'. During that time, I see my wireless connection with 'limited ...
11
votes
9answers
3k views

“Modern” Ethernet over coax

So, I've just bought a house. It's reasonably new - built in the early '00s. One of the features that got built in was a cable TV drop in every room. The cabling is gorgeous - there's even a wiring ...
11
votes
4answers
2k views

Wrong order in CAT5 cabling — does it matter?

I've got in-wall CAT5 wiring in my house. The wall sockets were done by an electrician and the requirement was straight-through T-568B, but I think he got it wrong. When I use a cheap cable tester, I ...
10
votes
7answers
5k views

Should I use a network hub or network switch?

I want to put a networking device on an Ethernet connection between 2 digital devices. The communication will be 1-to-1; there will only be 2 devices connected through the networking device. And I ...
10
votes
4answers
967 views

Why does no small Rj45 port exist? [closed]

While I bought my last Tablet I noticed that no Tablet (and most smaller notebooks /convertibles) has a Rj45 port. Which I finde quite dissatisfying since I like to use RJ45 in numerous places. I ...
10
votes
4answers
659 views

What would be the disadvantages of using a 4 stranded ethernet cable?

I got this cable with a homeplug AV 200 device - its labelled cat 5e But looking at the plug end has me rather dubious about it. (There's only 4 strands there, not the standard 8 - and missing ...
10
votes
3answers
3k views

Automatically prefer Ethernet over WLAN

Is is possible to force IP connections over the wired ethernet if it is connected and over wireless LAN if the wired ethernet is unavailabe (e.g. cable disconnected). Both network connections would be ...
10
votes
4answers
18k views

How to take advantage of two Internet connections (WiFi / Wired)?

I have two separate internet connections, one through WiFi and other Wired. However, generally I have observed that Windows try to use only one ( mostly faster one/ Or Wired by preference - I am not ...
10
votes
4answers
7k views

If a computer is connected to internet via wireless and lan both, which way Internet traffic would flow?

How does this actually work? How different ip addresses on ethernet adapter and wireless adapter are handled for internet data? I know these ip are translated in NAT table but the whole process ...
9
votes
3answers
474 views

Crimping CAT6 cables results in lower bandwidth than expected

I'm trying to make my own CAT6 cables, because I need specific lengths. I've managed to create 2 "working" patch cables, but when I hook them up to my cable modem, both of them take a fairly long ...
9
votes
3answers
2k views

Is testing Cat5 cable using a testing device necessary if I have verified connectivity with a computer?

I'm running some CAT5 cable around the house and this is the first time I've needed to build/terminate my own cables. I hooked up the cables to a computer and router and was able to reach the router ...
9
votes
4answers
5k views

Where can I find an unswitched ethernet hub? [closed]

Back when I was just getting into networking, ethernet hubs were common, and switches were a fancy, expensive alternative. Then the price of switches came down so much that hubs became pretty much ...
9
votes
1answer
60k views

How can I share a laptop's Wi-Fi connection through its Ethernet port?

I have two laptops, one with a working Wi-Fi connection (Laptop 1) and one without (Laptop 2). As I have no Ethernet plugs nearby I want to connect Laptop 2 to Laptop 1 via an Ethernet cable so that ...
9
votes
5answers
4k views

Set Ethernet Network as Metered Connection in Windows 8

Windows 8 introduced a new feature which allows users to set any Wi-Fi network as metered so that they can check their bandwidth usage: [img credit] But, it doesn't allow users to set any Ethernet ...
8
votes
3answers
724 views

Secure RJ-45 jack?

I work in several schools as basic on-site tech support. At one school (a middle school), students have figured out how to unplug out wireless access points from their jacks. Is there some standard ...
8
votes
6answers
1k views

CPU usage shoots to ~50% and stays there until suspended

This is the Windows Vista problem, seen, I think, mostly on dual processor laptops, where % CPU suddenly shoots to about 45% and stays there. Once this has happened, % CPU will never return to normal ...
8
votes
3answers
3k views

find an IP address by MAC on LAN

I would like to look up a MAC address on my ethernet and find the IP of that machine. What command should I issue using which app? edit: i've tried: fping -g 195.88.88.0/24 | arp -a | grep ...
7
votes
5answers
10k views

Combining two ethernet ports

My computer has two gigabit ethernet ports on the motherboard. Is it possible to have the OS (Win XP) combine them and treat as a single 2-gigabit connection? Failing that, is there any general ...
7
votes
4answers
13k views

Maximum/ ideal length of ethernet cable?

What is the maximum and/or ideal length of an ethernet cable? Is there a distance that data cannot be transferred over an ethernet cable, say over X number of feet?
7
votes
2answers
726 views

Cat 5e cable is dead?

I just moved into a house with extensive structured wiring cat 5e and RG6 in each room. The Leviton structured media cabinet only had telephone punchdown bridges, so I got a bunch of Leviton Cat5e ...
7
votes
3answers
8k views

Can I connect to two networks simultaneously with two Ethernet cards?

I have a LAN in my building that uses the 10.10.19.* IP range. In addition, I have an ADSL connection at home that uses the 192.168.1.* IP range internally. I also have two Ethernet cards. Is there ...
7
votes
1answer
402 views

What to specify for 10G Ethernet installation for new building?

I'm buying a house which I intend to live in for a couple of decades. The house is not complete yet, so now is a good time to specify modifications. It looks to me like it's worthwhile to wire the ...
7
votes
5answers
769 views

Computer sending data while turned off

I have a some what strange problem (which could have an easy and obvious solution for all I know). My problem is that when I've booted ubuntu (now 10.4 but same problem with 9.10) and turns it off it ...
7
votes
1answer
70 views

Two Devices, Same Subnet, No Communication

This is a stripped down version of my home network, and my problem is I can not get 192.168.20.100 to communicate with 192.168.20.4. The workstation pings both routers and the server fine, and ...
6
votes
9answers
1k views

Can CAT5 stand outside weather?

I have a very good network ethernet in my basement, so I was thinking of extending a CAT5 cable from the DSL router to the second floor where my office is. I can only pass that cable from the outside ...
6
votes
3answers
10k views

How to tell a Ethernet cable is conventional or crossover

I want to use a crossover Ethernet cable to connect two computers directly for file transfer between the two. I have several Ethernet cables, but not sure if they are crossover? How to tell a Ethernet ...
6
votes
2answers
17k views

Using “route add” to tell my computer to use a direct ethernet connection instead of wifi?

2 PCs are involved. Both are connected to the internet via Wifi on the same router. I can ping to/from each other and share folders flawlessly, but I'd like to be able to set a direct Ethernet link ...
6
votes
2answers
194 views

Do network hard drives require a computer to work/be network accessible?

I want the network hard drive or drive with an ethernet port so that I don't need a computer to make it network-accessible. Is a computer required, or can I do this computer-independently with an ...
6
votes
3answers
11k views

Windows 8 doesn't automatically join Wi-Fi network if Ethernet connection is active; router prevents Ethernet devices from seeing some Wi-Fi devices

In Windows 7, my laptop would automatically join both an Ethernet network and the Wi-Fi network in my house (both going through the same router). In Windows 8, if the Ethernet connection is present, ...
6
votes
1answer
841 views

Linux: Renumber ethernet devices

I have a VMware machine running Ubuntu 9.10 (Karmic) with three virtual ethernet NICs. For some reason, the kernel has decided that these NICs are: eth3, eth4, and eth5. There is no eth0-eth2. How can ...
6
votes
1answer
10k views

LAN speed differences between Cat5e and Cat6/6e cables?

From what I heard, cat5e ethernet cables are fully capable of supporting gigabit ethernet at full speed. However, I have also heard that gigabit speeds are not fully unlocked until you use cat6 or ...
6
votes
4answers
2k views

Is Cat 6 suitable for home network for computer and phone?

I'm planning to cable network my house whilst building an extension. I want to minimise later requirement for rewiring (and cost). I work from home but am a baby boomer, so don't know for how much ...
6
votes
2answers
2k views

What's the simplest (free) way to share a serial port over an ethernet link?

I have two computers and I'd like to access the serial port on one machine from the other. Is it possible to do this with free software and if so, what options do I have? The sharing machine is ...