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

learn more… | top users | synonyms

0
votes
2answers
41 views

Long cat5e cable

Cabling contractors put wires according to plan however I think the distance is longer than 100 meters as I cannot see devices connected on another end. When the cat5e cable is longer than 100 meters, ...
0
votes
0answers
28 views

Route Traffic For Specific IP Range Through Specific Network Interface

On Ubuntu 14.04. I need to route the traffic to specific IP ranges though a specific interface. route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref ...
1
vote
0answers
32 views

Can an improvised UTP cable from multiple CAT3 cables be improved? [closed]

First of all, a disclaimer: this is a total hack job, and I'm only a networking DIY enthusiast. I live in a student housing cooperative, and the two houses it comprises have an unused phone network ...
2
votes
1answer
25 views

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 ...
1
vote
1answer
34 views

Vios x LPAR Clients - SEA relationship

I am developing a script to list all SEA adapters in a VIOs, their related physical, virtual adapters, along with their status and VLAN TAG ids. I wish to include on this script the VIO clients ...
0
votes
0answers
77 views

Fast Ethernet UDP optimize receive buffers

I have a Linux computer which must receive streaming data from several devices (up to 30 or so) during long terms. This computer is connected to a Fast Ethernet local area network (100 Mbps) where ...
0
votes
0answers
4 views

How to enable ping between machines connected in two interfaces? [migrated]

I have a linux board with two ethernet interfaces as mentioned below. eth0 connected to another linux machine (ad-hoc) eth0 on board 191.168.1.2 connected to Linux machine 192.168.1.3 eth1 on board ...
0
votes
1answer
38 views

db servers direct ethernet connection

We are planning to setup 2 mysql servers in master-master replication Is it possible to use direct Ethernet connection over gigabit ethernet port on the 2 servers? Is there a way to bind mysql ...
2
votes
1answer
84 views

Send network signal over a very long distance of copper

I have an issue were I need to interconnect 2 switches together. We've estimated that they are 1400 meters away (cabling distance). I wanted to use a media converter to extend the signal on OS1 ...
-2
votes
2answers
75 views

What happens when overloading an ethernet cable

As the title suggests, what happens when overloading an ethernet cable? Let's say, I'm using a cat5 cable and transferring 150mbit over it. What will happen? Will it slow down to something below ...
0
votes
0answers
53 views

Meru wireless access point to controller traffic - packet analysis

We have been having persistent issues with a laptop cart in one of our buildings. The Problem The laptop cart contains (20) Lenovo E531 (i5) laptops running Windows 7 Pro connecting to our greater ...
0
votes
0answers
19 views

Automatically activating bridge slave connections

I created a bridge connection in the NetworkManager applet and assigned two ethernet interfaces to it. When I click connect on the bridge connection, the setup halts at "Obtaining network address" ...
21
votes
3answers
2k views

What is this wiring panel and what are these Ethernet “ports?”

In my office's building there is a stone-age LAN rack with some Ethernet ports I've never seen before. I need to find the name of this ports, if they have one, and then buy some cables or adapters. ...
0
votes
0answers
38 views

e1000g1 not running how to check if hardware is ok

system : Solaris 10 T2000 When I use the ifconfig -a I see the e1000g1 is UP but there is no RUNNING state. With dladm show-dev I get down. When I replace the cable from e1000g1 to e1000g3 (not ...
0
votes
1answer
49 views

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 ...
3
votes
0answers
48 views

100BASE-FX single-mode, confusing distances

I'm new to Ethernet over Fiber, so please bear with me. According to the standard, 100BASE-FX over SMF supports distances up to 10 Km. Technical documentation of some products states support for ...
0
votes
2answers
58 views

Private Network Interface between to MacOSX servers

We would like to set up and private single cable connection between two Mavericks servers, that also need to talk to the rest-of-the-world. The two servers for sake of argument are DB and Web. There ...
0
votes
0answers
145 views

route vpn over wifi when ethernet is first priority

I have a very special problem and google couldn't help me so far. I usually connect to the Internet via ethernet (en3). For some applications etc I need a wifi connection (en1). So my service order ...
1
vote
2answers
262 views

How is a TCP request routed from a virtual machine to an outside resource and back again?

Scenario: Computer A has a local ip of 192.168.1.100, which is running a VM inside of it. The VM now makes a tcp request to an external IP address (74.125.225.98). Could someone explain how the ...
0
votes
0answers
36 views

Difficulty sharing physical ethernet device with Xen 4.4

I have a virtualized PowerEdge T320, with a Ubuntu Server 14.04 running Xen 4.4 as host, that I use at my lab to do scientific computations (I'm the admin of the machine). This server has two physical ...
0
votes
0answers
38 views

issue with QSFP+ to 4x SFP+ cable

I have a Gigabyte MD60-SC0 motherboard which has a QSFP+ port. I need to connect this with another machine I have which has a Intel X520-SR2 NIC (with two SFP+ ports) plugged in. I also have QSFP+ to ...
3
votes
1answer
138 views

Unable to access network on Windows Server 2012 (Ethernet)

We have a server that had been using Ethernet, but temporarily Wi-Fi, and is now using Ethernet again. Strangely, it will not connect to the Internet. It detects when a cable is plugged into the port ...
0
votes
0answers
35 views

Debian ethernet interface goes down while streaming video

While streaming video FROM a debian box to the rest of a network, I regularly see the ethernet interface go down on this box after a couple hours of streaming and it doesn't come back up until the box ...
2
votes
3answers
195 views

Why is cat6 required for long cable runs?

I'm glancing over a Ubuiquiti airFiber radio starter guide and it says "outdoor shielded 5e or above cabling should be used for all wired Ethernet connections. Category 6 is required for ...
-1
votes
2answers
98 views

TCP/UDP Small Package Size optimization [closed]

I currently have the problem, that when a LOT of RTP streams (>800) go to one server the max. speed is onlynabout 70-80 Mbit (on a Gigabit LAN - all Hardware components are Gigabit components) 130 ...
1
vote
0answers
55 views

Dell PE2900 seeing only 1/2 ethernet controller

I have 2 ethernet controller on my dell poweredge 2900 : http://www.dell.com/downloads/emea/products/pedge/en/pe2900_Spec_Sheet_Quad.pdf But I only see one on my linux system : $ ip addr 1: lo: ...
1
vote
1answer
403 views

What is the difference between an Up MEP and a Down MEP for Ethernet OAM CFM?

I'm having trouble understanding the functional difference between an Up MEP and a Down MEP in CFM applications. Some sites say they are defined based on network direction, others seem to think they ...
1
vote
1answer
523 views

How do I increase the ring parameters for a NIC on a Linux server

I used the ethtool utility to increase the rx and tx values for the NIC on one of our servers. I ran the following command: ethtool -g eth0 Ring parameters for eth0: Pre-set maximums: RX: ...
3
votes
1answer
188 views

Any benefit and/or risk in enabling Jumbo Frames for the DAG replication network?

Exchange 2013 DAG, two nodes, a dedicated GBE network interface on each server for replication traffic, connected to a GBE switch, using a dedicated VLAN. Is there any benefit to Exchange replication ...
0
votes
1answer
22 views

How to fix non-working ethernet under Linux, with RX permanently increasing?

I have a system with the latest Linux Mint. An ethernet cable which yields internet with no special action from me under Windows 8.1 is detected under Linux, but does not seem to work. Running ...
1
vote
1answer
160 views

Connect access switches to router or core switch

My workplace consists of 4 access unmanaged network switches from three different computer rooms connected to a router. The router contains three 100mbps ethernet ports and one Gigabit (GigE) port. ...
0
votes
1answer
59 views

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 ...
0
votes
1answer
77 views

Does the IP -> Ethernet multicast address mapping ambiguity matter for IGMP snooping switches?

There are 2^28 possible IP multicast addresses, but only 2^23 possible Ethernet (MAC) multicast addresses (http://technet.microsoft.com/en-us/library/cc957928.aspx), which is why e.g. 224.1.1.1 gets ...
0
votes
1answer
158 views

OpenVPN cannot connect to local machine that has two NIC cards

This is my first time EVER posting to these forums. Most of the time when I have an issue I can usually solve them by searching forums/Google. But this one issue has me stumped! My company just ...
2
votes
1answer
89 views

Two LAN cables when using Remote Access Card?

I recently bought a HP MicroServer N54L and a HP Remote Access Card. Connecting to the server over a KVM viewer for BIOS setup etc. works fine, but when it comes to installing Ubuntu 14.04. the ...
0
votes
0answers
160 views

Can't seem to see local network on Wine

I'm trying to use Wine on Ubuntu to use a proprietary Windows program that looks for a proprietary device on the local network. I don't know where it's looking, which protocol, port or IP address it's ...
2
votes
1answer
246 views

Is there a standard managed switch configuration protocol?

is there a vendor-independend managed switch configuration protocol e.g. for creating VLANs that can be run over TCP or serial port?
-1
votes
1answer
105 views

What is the most proper way of wiring RJ45 for Cat6/LAN?

I currently know of three different wiring patterns for RJ45: T568A, T568B, and USOC. Simply put: Which is the best method for creating a Cat6 cable? From my research, it seems like I should use ...
-2
votes
1answer
117 views

ethernet switch makes network down [closed]

I have a D-Link 8-port Ethernet switch which was perfectly working. Since 2 days ago it makes the entire network down. The problem is when I disconnect the cables it runs again and after I connect ...
4
votes
1answer
3k views

e1000e Reset adapter unexpectedly / Detected Hardware Unit Hang

I have a Dell 1U Server with Intel(R) Xeon(R) CPU L5420 @ 2.50GHz, 8 cores running Ubuntu Server Kernel Version 3.13.0-32-generic on x86_64. It has dual 1000baseT networking cards. I have it set up to ...
0
votes
1answer
23 views

Why am I seeing prefixed/duplicated packets coming from a comcast device?

I'm looking at traffic my CPE from Comcast in Wireshark, and for every packet, there is an additional packet that is the exact same, except for 4 additional bytes at the beginning of the frame ...
3
votes
2answers
501 views

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?
0
votes
0answers
139 views

zeroshell unsupported onboard Intel Ethernet I217-V and I210

I recently installed zeroshell 3.0.0 on a machine with a supermicro motherboard that has 2 onboard ethernet cards. It seems that this version of ZS does not support both of ethernet. I've read from ...
0
votes
1answer
156 views

Suddenly unable to obain IP address but eth0 port blinking rapidly

After a server restart, the server is unable to obtain an IP address through a wired ethernet interface, neither automatically nor manually. However the green light on the back of the machine where ...
5
votes
3answers
1k views

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 ...
0
votes
1answer
62 views

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?
1
vote
2answers
504 views

How can I change metric of public network in route table

In my windows 8.1 ENT [64 bit] machine I have 3 network adapters. Ethernet 1 is connected to public network and other 2 ethernet adaptors are connected to different internal networks. The problem is ...
3
votes
2answers
448 views

Should Carrier Ethernet traffic be encrypted?

I'm looking for a best practice answer. We have a 100Mb point to point Carrier Ethernet circuit between a corporate office and an offsite data center. Basically we have SQL traffic replicating to ...
0
votes
0answers
67 views

AR8151 eth0 heavy trouble

First I had really bad issue with network speed. There I got this good article: http://mindmapapp.blogspot.com/2012/01/use-atheros-ar8151-ethernet-card-on.html But now I have really crazy things ...
0
votes
1answer
22 views

Use local Internet connection

I have a network split into through two ethernet segments through a virtual VPN hub. In the figure, blue is the part of the network that I control. My problem is due to the orange subnetwork, that ...