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

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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
476 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
2k views

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
665 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
422 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
159 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
507 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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1answer
173 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
1k views

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
800 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
756 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
2k views

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
142 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
193 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
473 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 ...
2
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1answer
246 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
574 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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3answers
470 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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2answers
937 views

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
428 views

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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3answers
185 views

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
2k views

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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0answers
214 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
1k views

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
671 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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552 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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0answers
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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
630 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
8k 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 ...
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3answers
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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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2answers
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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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2answers
546 views

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
652 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 ...
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3answers
3k views

How could one speed up SSHFS in LAN?

I am using SSHFS to transfer files under Linux between my notebook and my desktop machine. It's easier then NFS because one doesn't have to configure mount points and permissions a priori. Now, using ...
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4answers
641 views

Ubuntu is showing weird HWAddress for eth0 after a power failure

Recently, my ubuntu box encountered a power failure. After rebooting, the HWAddress of eth0 is showing a very weird number: 00:00:00:00:00:30. I have tried sudo ifconfig eth0 down & sudo ifconfig ...
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2answers
957 views

Core & Edge switch design: backplane as a point of failure?

We are in the midst of planning a re-cabling of the building and installing new switches. A few different designs have been proposed, and one such design puts our core switches at the heart of our ...
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2answers
122 views

dual interface NIC with hw bridging?

I'm looking for a PCI NIC with two PHYs that is capable of bridging/switching in hardware but allows the host to monitor the traffic. Does such a thing exist? This would be running on a linux host. ...
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4answers
355 views

Open source tool monitor network

I am after an open source tool to monitor the network traffic of a small lan. I thought of wireshark but the amount of details it captures is massive. What I need is just a basic analysis of the ...
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8answers
5k views

Any thoughts on 6 inch ethernet patch cables?

It seems like no matter how strict and careful we are in our closets when we set them up, they eventually turn into a giant knot. In part I blame the fact that we've got a rather large number of ...
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11answers
7k views

What is a good default IP address?

My company makes Ethernet devices. These devices have very little I/O. No keyboard, no video output. When the customer gets the device he must configure it for his network. I'd like to choose an ...
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1answer
903 views

ubuntu network interfaces config

I had many ip-s routed to my dedicated server. Interfaces file look like this auto lo iface lo inet loopback auto eth0 iface eth0 inet static address xx.xx.xx.xx netmask 255.255.255.xx gateway ...