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

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How to diagnostic internet access failure on a linux system?

I have a VM running on Xen. The virtual machine was running fine for months and suddently the network access broke down. Dom0 DomU .-------. bridge ...
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20 views

Is it possible to turn PC into a router, so that I can send data to it? [on hold]

I would like to transfer data to my PC a bit quicker, than I am now ( which is sending it over wi-fi through the router ), but it would seem that both USB and Ethernet creators just hate easy ...
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1answer
35 views

Should I use a straight-through or cross-over for router to extender cabling?

I'm trying to conncect a router to a repeater (extender) should I use a straight-through or cross-over for the ethernet?
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2answers
81 views

Lightning/surge risk of Ethernet cable run inside an exterior wall [closed]

In a previous question, I had planned a Cat6 (Ethernet) cable run outside a home, adjacent to a coax run. I was advised against it, and I'm interested in taking that advice. Now I'm considering ...
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9 views

Does Intel's FlowDirector work for multicast traffic?

FlowDirector works by sampling outgoing packets, and establishing a core<->flow association so that when packets come in, it can lookup which core to send it by way of the usual RSS 3 or 5-tuple. ...
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1answer
170 views

Surge protection for outdoor network cable run [closed]

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 ...
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2answers
48 views

Transparent switch from Wifi to ethernet

I have the following network setup: Zyxel USG 200 Firewall which also acts as DHCP server 2 Switches 2 Wifi APs (Zyxel NWA3560-N and WAC6503D-S) with NAT and DHCP disabled The clients (mostly ...
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1answer
54 views

Trouble with network (ping, route, gateway)

I have a server running CentOS 7 and I connect to it by ssh. SSH takes a little bit to connect compared to the other server I have setup. This server has 2 ethernet ports (1 motherboard and 1 card). ...
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52 views

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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21 views

Suse11 default gateway lost after interface restart

Doing some test on a SLES 11 SP2 virtual server I noticed the default route was lost after restarting the related interface: # netstat -rn Kernel IP routing table Destination Gateway ...
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2answers
42 views

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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1answer
71 views

VMware infiniband configuration

I have a server which is intended to be a vmware host. This server has two Infiniband Mellanox ConnectX-2 dual-port cards. What I want to do is to make the following setup: The first card should work ...
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3answers
82 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, ...
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0answers
105 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 ...
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0answers
58 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 ...
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1answer
64 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 ...
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1answer
71 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 ...
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0answers
232 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 ...
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1answer
50 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 ...
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1answer
151 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 ...
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2answers
84 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 ...
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0answers
126 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 ...
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39 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" ...
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3answers
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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. ...
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61 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 ...
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113 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 ...
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90 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 ...
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2answers
74 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 ...
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193 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 ...
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2answers
277 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 ...
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45 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 ...
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70 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 ...
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293 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 ...
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41 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 ...
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3answers
233 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 ...
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2answers
142 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 ...
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66 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: ...
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1answer
698 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 ...
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1answer
1k 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: ...
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1answer
271 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 ...
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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 ...
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1answer
223 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. ...
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1answer
67 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 ...
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1answer
90 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
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1answer
189 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
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1answer
117 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 ...
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201 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 ...
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1answer
251 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?
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1answer
143 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 ...
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1answer
136 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 ...