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

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TIA 568A vs. B Wiring for Long Ethernet Run

I have a long Ethernet run (about 280 ft/85 m) that goes through a conduit between two buildings. On each end, I have an APC Ethernet surge protector that is grounded to the main ground for each ...
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2answers
28 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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2answers
1k views

How can you force a Mac Pro's “Ethernet 2” link to UP, without a cable attached?

All Mac Pros / XServes have 2 gigabit wired NICs. It has always annoyed me that a: there is no way to bridge them (no BRCTL, et al. for Mac), and b: there is no way to "use" the second port, even ...
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1answer
28 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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1answer
1k views

Packet drops after configuring Ethernet Bonding

I am trying to configure Ethernet bonding for our servers . Both the Ethernet interface in my server are connected to two different network switches physically. Looks like my Ethernet bonding ...
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6answers
4k views

Why do partially failed/failing switches fail to pass DHCP?

I've noticed this several times: a switch starts to behave oddly. Usually if the switch doesn't fail outright, what tends to get noticed is that DHCP doesn't work. We had a Linksys SRW-224P fail ...
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3answers
57 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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1answer
111 views

I have a firewall that supports 1Gbit ethernet ports but 1.4Gbit of traffic, can I make use of a 10Gbit pipe from the router in this case?

We're putting up a rack of servers in a datacenter which provides us either a 1Gbit pipe or 10Gbit pipe from the router (our choice, our package includes 10Gbit). But if we have a firewall which ...
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3answers
1k views

Ubuntu Server, 2 Ethernet Devices, Same Gateway - Want to force internet traffic through 1 device (or at least allow it to work!)

I have a Ubuntu 10.04 Server with 2 ethernet devices, eth0 and eth1. eth0 has a static IP of 192.168.1.210 eth1 has a static IP if 192.168.1.211 The DHCP server (which also serves as the internet ...
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51 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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1answer
51 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
40 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
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1answer
31 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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6answers
10k views

Does a single LACP channel over multiple switches increase redundancy?

I am curious for opinions, findings, or evidence that having multiple interfaces bonded using LACP to ports in multiple switches can increase redundancy. Previously bonded interfaces have always been ...
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0answers
150 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
498 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
43 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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2answers
9k views

How to ping eth0 from eth1 on my linux machine?

I have a linux machine with 2 ethernet ports(eth0 and eth1). eth0 is connected to a router which assigns it an IP address 192.168.1.2. eth1 is connected to a switch which doesn't have an IP. How do I ...
2
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1answer
97 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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1answer
1k views

What is theoretical maximum of TCP traffic over GigaEthernet?

What is theoretical maximum of TCP traffic over GigaEthernet ?
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3answers
279 views

What if a computer with Ethernet

I'm just revising for an exam on Networks and Data Communications, and there's one thing I don't get about CSMA/CD and Ethernet. It's supposed to be fairly stable, for instance if a computer drops out ...
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2answers
699 views

Ethernet full duplexity and collision confusion!

Folks, I am having a tough time figuring this out: in a full-duplex LAN segment are there any collisions to be taken care of when (i) There are only two stations connected point to point (ii) When ...
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2answers
1k views

half-duplex and full-duplex Ethernet vs Switches and Hubs [closed]

From a youtube video I came to know of the following things All machines connected to a HUB are a part of a single collision domain. All machines connected to a SWITCH are a part of a single ...
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2answers
772 views

VLAN setup on my PC [closed]

I am bit new to VLAN. I want my two computers communicate through VLAN. I have following queries. As I am new to it my queries may be somewhat vague in some points. But i would like to hear from ...
2
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1answer
3k views

eth0 NIC Link is Down repeating message in kernel log

I've noticed since few days ago that same repeating kind of messages occurs and I positively can say that nothing was intentionally changed (installed/uninstalled) in that period. here's sample of ...
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2answers
79 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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78 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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1answer
1k views

Very low throughput on 10GbE network

I have two Linux machines, each equipped with a Solarflare SFN5122F 10GbE NIC. The two NICs are connected together with an SFP+ Direct Attach cable. I am using netperf to measure TCP throughput ...
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1answer
1k views

VirtualBox VM network hangs due to ethernet “Reset adapter” [closed]

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 ...
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22 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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0answers
44 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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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. ...
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1answer
63 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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64 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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3answers
172 views

long distance cat5 run

I need to run a cat5 cable 400'. I know this is just a little over the 325' that the 'standard' says cat5 can do, and will probably work. But we'd like to make sure this isn't a weak link in the ...
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2answers
106 views

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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1answer
4k 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 ...
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6answers
18k views

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 ...
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1answer
161 views

Network port mounting bracket/box

Does anyone known of a source for open back, low voltage, old work, electrical boxes that are intended to be installed through the Sheetrock and mount to studs? I've found boxes for old construction ...
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3answers
491 views

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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2answers
64 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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1answer
1k views

10GbE be2net low pktgen performance

I am testing the network performance of two workstations, each having 2.4GHz Xeon quad core processors and NC550SFP PCIe Dual Port 10GbE Server Adapters, linked back to back. I've checked the ...
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0answers
165 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
265 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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2answers
136 views

Different speed on Internet connection by switching NICs. Can someone make sense of this?

I solved my Internet speed problem, but I'm still puzzled. I can't understand what happened. My scenario: a small intranet is connected to Internet through a Linux gateway that connects to a Cable ...
3
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2answers
105 views

Is a DCB switch required for a FCoE setup?

I'm looking to play around with a test Fibre Channel over Ethernet (FCoE) deployment between 2 Xen servers and 1 storage server. Eventually I plan to replace our ageing NFS shared storage solution. ...
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0answers
42 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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0answers
53 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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38 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 ...
3
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1answer
163 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 ...