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

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ethernet smp_affinity vs /proc/interrupts vs /sys/class/net/ethX/device

My goal is to configure our CentOS ("free" RHEL) 5.x servers for custom low-latency network programs. I would like to experiment with binding ethernet NIC interrupt handling to the same CPU on which ...
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3answers
149 views

What's a good metric for determining the performance of my ethernet link across my optical comm. channel?

I have a system that I've built for using optical signals to communicate underwater. I'm using a GNURadio + USRP system to test this and I have a program that creates an ethernet connection across my ...
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1answer
168 views

What is maximum traffic of data that can pass through a coproprate intranet in a day? [closed]

Can someone please tell how many maximum terabytes of user data can be passed in a day in a data migration application involving both client and servers on the same intranet, assuming that network is ...
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3answers
16k views

how do I disable autonegotation and force specific ethernet settings?

I have a Dell r710 (running Debian GNU/Linux 6.0) which is currently in a datacenter hundreds of miles away, and the ethernet card is stuck at 10baseT half duplex. 10baseT is OK, but I want it to be ...
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1answer
383 views

How to create a virtual ethernet card for SSH tunneling through USB device? [W7]

I have an SSH tunneling that is connected to an USB device that is connected to the Internet. How can I configure a virtual ethernet card that get everything to 127.0.0.1:1080?
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1answer
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Why didn't my Linux server start with an active network connection?

I booted my Linux server today via WOL. When it came up, I couldn't SSH onto it. I checked the server and it had booted into the OS but wasn't reachable on the network. I checked my router which ...
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6answers
342 views

Can you totally ban a PC from the local network?

I was wondering whether it is possible to ban a PC from LAN or WLAN totally or not? I know that banning according to MAC address is useless, as it can be altered. P.S: assume that no credentials are ...
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1answer
73 views

isdn s/t vs ethernet vs adsloisdn

On the back of my cisco router, I see the following ports: 4 LAN ports ISDN S/T ADSLoISDN Console Two really basic questions: 1) Is the ISDN S/T port like any other WAN ethernet port? (i.e. can I ...
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3answers
78 views

Windows: How to know which client is connected to the other end of the cable, by looking at this end of it?

I have a bunch of cables disconnected from a faulty network switch. What is the fastest way to determine which cable goes to which client PC (windows) / server (windows) / other devices etc..
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4answers
2k views

Simple way to make wired internet wireless without router [closed]

Is there any device which you can plug into an Ethernet port and then have it broadcast the internet connection it receives through Ethernet wirelessly with a set password (maybe a serial number on ...
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1answer
494 views

How to stop ethernet interface in bridge configuration from obtaining IP address via DHCP

I'm trying to configure openvpn in bridging configuration. First step of doing this requires creating bridge interface (br0), bridging together physical ethernet interface (eth0) and logical tap0 ...
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2answers
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what should be the destination MAC address for a limited broadcast address(255.255.255.255)

configuration: host(H1-10.10.10.55/24) has a default gateway(g1) 10.10.10.1/24. Question 1:H1 sends a packet to 255.255.255.255. What should be the destination MAC address in the outgoing frame? ...
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2answers
688 views

VLAN setup on my PC

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 ...
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1answer
435 views

assign auto static ip on ubuntu 10.04

I'm trying to set auto static ip. I've set the content of /etc/network/interfaces to be: auto lo auto eth0 iface eth0 inet static address 192.168.1.2 netmask 255.255.255.0 gateway 192.168.1.1. and ...
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3answers
161 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
3k views

Add Ethernet to HP Color LaserJet CP1215? [closed]

On the back of my HP Color LaserJet CP1215 there is a USB port and a spot where an Ethernet port might possibly be located. It is covered by a black plastic insert, and the metal on the back has the ...
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4answers
1k views

Ethernet switch capacity question

We're looking at hooking up 48 small embedded systems with 10/100 Ethernet ports to an Ethernet switch and then have that switch talk to a server upstream via a faster connection. I have a couple of ...
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1answer
529 views

Daisy-chaining network switches with multiple cables

This might just be the dumbest question you'll ever read, but I digress. Say I have two 100Mbps Ethernet switches with 2 computers on each, connected together by a single cable. This way, the two PCs ...
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2answers
191 views

What percentage of its capacity should I aim to run a network at?

First of all, apologies if this is the wrong StackExchange site for this question - it's about Ethernet network capacities, but not specifically about servers etc. I am designing a network for a data ...
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4answers
1k views

ISCSI: Ethernet cable maximum length vs. SCSI command timeout

I have a question about a non-optimal setup and the practical implications of this. Ideally you would place the ESXi server right in the same room as the FreeNas white box end of question. My ...
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2answers
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Hostname resolution in a machine with multiple running eth ports

Consider a machine having 4 eth ports running on it. Then to which eth port's ipaddress will the hostname resolve to? Kindly guide me to some documentation to support your answers so that I could use ...
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2answers
852 views

Will 1000BASE-LX autonegotiate to work with 100BASE-FX

We have existing equipment that uses 100BASE-FX (multi-mode fiber). Will it work with 1000BASE-LX (also multi-mode) through autonegotiation? Virtually everything I found on the web about ...
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1answer
823 views

Switch Before Firewall / Router - Multiple public IPs

I currently Have a 10Mbit Full duplex circuit connected to a small unmanaged switch which then connects to a Sonicwall Firewall / Router. I have several public IP addresses (/28) that are assigned to ...
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1answer
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10 GigE interfaces limits single connection throughput to 1 Gb on a ProCurve 4208vl

The setup is as follow : 3 Linux servers with Intel CX4 10 GigE controllers and an X-Serve with a Myricom 10 GigE CX4 controller are connected to a ProCurve 4208vl switch, with a myriad of other ...
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1answer
146 views

Asus WL-520GC + external HDD via Ethernet

Has anyone experience of using such combination? Exactly with the same model (or from same model line). How does it works? How hard is to set up all that? What difficulties? I use this router a ...
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3answers
198 views

How to maximise performance in computers connected into LAN via Gigabit ethernet router?

Our group is setting up a server (which might just be a NAS, but we're not sure yet), which shares files, so that it connects to all other computers in the room (about 10 of them). I am thinking just ...
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4answers
478 views

2 servers cannot see each other in internal subnet (192.168.1.10)

I have a few servers in one rack. They all have 2 network interfaces eth0 and eth1. On all, eth0 has a public IP address assigned which works well. I'm setting up a private subnet on the second eth1 ...
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3answers
88 views

Surge Protection For Roving Staff - Ethernet Protection Required?

We have staff who travel all over the world to places such as Rwanda, DRC using laptops. Currently they use Notebook Travel Surge Protectors. Some of our offices have been hit by lightning - and this ...
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1answer
249 views

Dell PowerEdge 1600SC Server - Ethernet port semi-functional

Dell PowerEdge 1600SC Server: First it had Fedora 12 with Amahi Home Server on it, then I installed Windows Server 2003 Standard on top of it. The ethernet port worked for Fedora and Server 2003, but ...
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3answers
596 views

What is the difference between a hub and a switch?

I'm sneeking around online store for used stock of hubs, routers and switches for a project I have to build a network infrastructure. So far, I have bought: 1x Cisco 2514 Router; 5x Cisco Serial ...
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481 views

Is an Ethernet point to point connection without a switch real time capable?

In automation and control, it is commonly stated that ethernet can't be used as a bus because it is not real time capable due to packet collisions. If important control packets collide, they often ...
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Redundant/Failover Ethernet Link from Windows Server to Switch

I'm trying to set up a redundant link from my Windows server (Dell R710 with 4 GigE ports) to my Cisco switch. I'd like to "failover" in case the first Ethernet link fails (e.g. NIC issue, cable ...
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7answers
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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. ...
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3answers
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Ethernet: network topology

Consider a standard GigE network switch. In order to do the switching, presumably it needs to maintain a map of MAC addresses of all things that exist on the network to its (switch's) port numbers. ...
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Link mode on unmanaged gigabit switches

I have two RJ45 sockets connected by an inaccessible unknown-category twisted pair cable. I plug two unmanaged gigabit switches into the sockets using Cat6 cables, and they negotiate a 100Mbps link. I ...
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2answers
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Is it possible to use ebtables to filter traffic by MAC-addresses on simple ethernet interface, without bridging?

I have a linux machine (my workstation). From there I can ping other local machines, let's say 192.168.1.22. Let's say I want to prohibit communication with 192.168.1.22 by it's MAC address. I'm ...
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216 views

Wireless cuts out after 10 - 15 machines connect

I am suffering a bit of a problem where if we have more than 15 machines connecting to the access point it will connect, but the ping will be in the thousands and drop connection and cut all wireless ...
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4answers
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Determine switches between devices on LAN

I'm on a network where most devices are DHCP. If I have a few switches between device A and a DHCP server, how can I find out what they are? traceroute just gives me 1 hop, regardless of the number ...
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2answers
326 views

Ethernet over copper thoughts

We currently have 2 DS1 lines in a multilink configuration delivering 3mbits. It works well, but we could certainly benefit from more bandwidth. As I was talking to our sales rep at XO communications, ...
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1answer
681 views

Increase network bandwidth between 2 servers

Is it possible to increase the network bandwidth between 2 servers on Windows Server 2008 and Windows 7 ? For example : Use 2 Gigabit NICs on each computer to have 2 Gigabits/sec between 2 machines ? ...
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2answers
599 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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Squid3 not working. Access denied

I installed SQUID3 on a Linux machine with two ethernet interfaces (eth0 and eth1). I used the default settings in the squid.conf file and uncommented the two lines acl localnet src 192.168.0.0/16 and ...
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1answer
656 views

Setup squid3 proxy server on linux server with 2 ethernet ports

I need to setup squid3 proxy server on my linux machine with 2 ethernet ports(eth0 and eth1). eth0 has an IP address of 192.168.1.2 assigned by a router which provides internet to the system. eth1 is ...
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2answers
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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 ...
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broadcom 5722 NIC not installed on Ubuntu Server, although driver present

I just installed Ubuntu Server 10.04 LTS, running kernel 2.6.32-24-server, on a brand new Dell T110 server, supposedly fully compatible with Ubuntu Server. I have two NICs: one ONBOARD, the other ...
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How do VLANs work?

What are VLANs? What problems do they solve? I'm helping a friend learn basic networking, as he's just become the sole sysadmin at a small company. I've been pointing him at various questions/answers ...
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Unusual behaivior of ethernet cards on CentOS

So I am experiencing some weirdness on one of my servers. It has two on board gigabit ethernet ports on it's motherboard both of which seem to have been detected correctly (Broadcom NetXtreme II ...
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4answers
117 views

switch or other device?

i want to get a network device working as a multiplexer. for example, only the data sent to port A would be forwarded to port B completely. and the data of port B have to be forwarded to port A ...
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2answers
698 views

Software to Generate False ARP Requests?

A product I'm testing appears to freak out when it receives an ARP request with a Sender IP Address of 0.0.0.0. This is not an ARP probe, as the request is addressed to my module, and the customer's ...
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1answer
100 views

Network fails when workstation powered off

I have a network of about 50 PC's connected through an HP Proliant switch, with Cisco routers. There are 4 workstations that exhibit some very strange behavior. When you power any one of the computers ...