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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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Ethernet frames: what are the source and destination MAC addresses?

Imagine you have some network configured like this +-----+ +------+ +------+ +-----+ |comp.|---|bridge|---|router|---|comp.| | A |---| B |---| C |---| D | +-----+ +------+ ^ +------+ +-----+ | …
F. P.
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How to fix the wiring mess that is my server room

So, I have inherited a mess of a server room. Rack 1: 5x 48 port patch panels; 140 in use | 3x 48 port switches Rack 2: 4x 48 port patch panels; 120 in use | 3x 48 port switches Rack 3: 3x 48 port patch panels; 95 in use | 3x 48 port…
Zero0ne
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Is it possible to match an internal IP address to a switch port?

I'm trying to find a computer that has a certain IP address on our internal network. I have identified the computer name from DNS, but in this case it does not help me. Just wondering if I can somehow tie the IP to a switch port, and track it from…
Brent
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Created AWS EC2 instance from snapshot AMI, eth0 is missing after startup

I recently created a new EC2 from a snapshot of our Production EC2. The machine started up fine, and I can ssh in, however - cannot access via anything else. No WWW, nothing. Upon further inspection of the device, primarily the network stack - I see…
Barry Chapman
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Tool to physically test ethernet cable with two network cards?

We're building ethernet cable or a non-profit community computer lab. We test them with a cheapie cable tester, which I believes simple checks the electrical connection of each wire. We're having some problems with the networking ( pings are…
user26664
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Surge protection for outdoor network cable run

I'm going to have a network cable run between floors of a home, and most of the run will be outdoors, up the side of the building. I ordered a spool of shielded UV-rated waterproof Cat6 cable. From what I've read, I should ensure that if any part of…
cp.engr
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VirtualBox VM network hangs due to ethernet "Reset adapter"

I have a VM which I've created on a host using the following settings: http://pastebin.com/raw.php?i=sevF5V7Z It has been up and running smoothly for months but recently the VM lost connection with the outside world. When this happened the following…
cherouvim
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command for MAC broadcast

I am looking for a command to discover all hosts on the same LAN segment from a host with unassigned IP, default gateway, and subnet. I know there's ping 255.255.255.255 but that operates at layer 3 and requires the sender have an IP address. Is…
T. Webster
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How do I poll the ARP table with an SNMP OID?

When you need to poll the ARP table of a device, conventional wisdom is to use ipNetToMediaPhysAddress or atPhysAddress; however, both of these OIDs are deprecated according to Cisco's documentation. These OIDs work just fine; however, I'm building…
Mike Pennington
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FCoE, on any Ethernet switch?

I understand the concept of FCoE. I have looked at the Wikipedia page and looking at the layer 2 frame diagram, it looks like FCoE really should "just work" on any Ethernet switch, but is this really the case? If so, what do switches like Cisco's…
jwbensley
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Keystone vs. Feed-Thru vs. Punchdown Patch Panels

We have a new office that needs some ethernet wiring done to a cabinet in a closet (no more than 48 cables). There seems to be so many options now. I'd traditionally terminate everything at a rack-mounted 110 style punchdown patch panel, but there…
Jordan Mendelson
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What is theoretical maximum of TCP traffic over GigaEthernet?

What is theoretical maximum of TCP traffic over GigaEthernet ?
d_pilot
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Latency in TCP/IP-over-Ethernet networks

What resources (books, Web pages etc) would you recommend that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak…
NPE
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Effect of heat on CAT5 Ethernet Cabling

I am wondering what the heat rating is on standard CAT5 cabling or where I can check the heat rating of my cabling by using the information inscribed on the cabling? In my specific situation, I am trying to decide if the length of CAT5 I have…
jmlane
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Multiplexed 1 Gbps Ethernet?

Is it possible to multiplex two (or more) 1Gbps Ethernet into a single logical connection? Is it common place? Advisable? Stupid? Other considerations? I ask because my hosting partner's network infrastructure is 1Gbps, but I have the need for…
Stu Thompson
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