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

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Why both T568A and T568B standards?

I've always wondered why there are the two different wiring standards for Cat5 UTP cabling. The only technical difference between the two is the green and orange pair are swapped, which accomplishes ...
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3answers
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Can a broadcast storm develop in a loop caused by a wifi connection?

If my laptop or other computer is tied to a wired network, and it automatically joins a wifi router attached to that same network, can the two connections to the network cause a loop that starts a ...
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5answers
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Keystone vs. Feed-Thru vs. Punchdown Patch Panels

We have a new office that needs some ethernet wiring done to a cabinet in a closet (no more than 48 cables). There seems to be so many options now. I'd traditionally terminate everything at a ...
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1answer
507 views

Hardware won't respond to each others ARP requests

I have two pieces of hardware (embedded devices) that I have setup to communicate via TCP over Ethernet in a client/server fashion. The topology of the network is as follows: ----- | S ||=|== Debug ...
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1answer
742 views

SIOCSIFFLAGS: Resource or Device Busy

Have a Dell PowerEdge 2350 with dual nics built into the motherboard. eth0 works fine. Setting up an IP under eth1 results in the error: "SIOCSIFFLAGS: Resource or Device Busy". I have two ...
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109 views

Network topology

I am writing a network application that has several machines that serve separate clients, but machine themselves need to communicate with each other frequently. Let's say multiple chat servers for ...
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2answers
652 views

What does scalability mean when talking about ethernet networks [closed]

I need to do a homework and write a bit about ethernet. I am totally new to the topic, so i thought maybe some one could give me a hand by explaining me a bit about what scalability is, when talking ...
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1answer
167 views

Which cloud services allow layer 2 link level connections between servers?

There are advantages when you can deploy one server A so that it serves as the IP gateway for machines B, C, and D. In a real machine room, for example, A can balance incoming customer connections by ...
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3answers
462 views

Original Corinex powerline ethernet wall mount

I am re-purposing some old Corinex powerline ethernet wall mounts. They came with a setup cd with a wizard application for setting up the hardware, but the application doesn't seem to work on 64bit ...
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2answers
572 views

Using eth0 and ppp interfaces in a interchangeable mode

I've a Debian system without UI, with a GPRS modem attached to it. Now, this system is connected with ethernet through a standard cable. I want to obtain a configuration that allows the computer to ...
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3answers
481 views

Performance penalty of multiple IP's per network interface

How can I measure the performance penalty of a network adapter that is configured with 2 IP addresses per eth0 ? The network card has 2 physical interfaces (ports): eth0 and eth1 with only eth0 ...
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1answer
179 views

Port Mirror and 802.1Q

Does a port mirror send ethernet frames out of the switch-port with the 802.1Q header bytes still on the frame?
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1answer
300 views

STM-64 to Ethernet conversion: proper solution required

We need to arrange Ethernet network between two cities - this gonna be a partnership with other organization: we help them with equipment and get some bandwidth. I am newbie beyond 1 Gbit networks, ...
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3answers
124 views

HOWTO: Ring Ethernet Lan, My drawing Correct?

I have a special demand that to improve the redundancy of a network. (any of the cable between switches broken will NOT disconnect any clients) S = a switch C = a computer - = CAT5 cable ...
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1answer
454 views

Solaris ethernet ports: nge2 and nge3 are missing

There is a Sun X4100 with an interface nge0 which is configured and working. The server has a group of 4 network jacks in the back and nge0 corresponds to ethernet port 0. I tried enabling ethernet ...
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1answer
369 views

Acceptable number of ethernet errors in a medium sized environment?

I'm implementing a monitoring system for an existing modest sized data center deployment. So far I've only gotten to the host / application side of the monitoring equation but I'm noticing what I ...
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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
1k views

What is theoretical maximum of TCP traffic over GigaEthernet?

What is theoretical maximum of TCP traffic over GigaEthernet ?
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1answer
184 views

System MTU for SAN switch

I have a SAN with redundant cisco 2960s when I set it up a while ago I set all of the interfaces to use an MTU of 9000. I was looking at the config today and I noticed this line system mtu routing ...
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2answers
700 views

Optimal Ethernet speed for dedicated web server 100Mbps vs. 1000Mbps

I'm busy upgrading my dedicated web server. The server only serves web users over the internet. It seems to me that any NIC speed over 100Mbps may be overkill considering all traffic is coming from ...
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1answer
88 views

Would using a bridged connection on a machine allow the machines connected to it use the internet?

In this specific case I wish to connect my first computer wirelessly to a router, and have the laptop use a bridged connection to Ethernet to extend to other computers. The other two computers will ...
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2answers
2k views

Linux is not sending arp request

We have a local network that is connected to internet through linux gateway. There are about 50 workstations in LAN. We recently started observing a problem that gateway sporadically stops responding ...
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1answer
2k views

Ethernet link dropping out consistantly (CentOS 5.5 / Dell 2950)

A few days ago the internal interface on one of my backup servers went down, and I've not been able to get it to work correctly since. In dmesg, I'm seeing: ADDRCONF(NETDEV_UP): eth0: link is not ...
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2answers
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Windows Server 2008 R2 IP Address Binding order

How do I set the order of multiple IP addresses all bound to one ethernet interface?
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2answers
3k views

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
164 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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3answers
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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
393 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
2k views

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
359 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
80 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
79 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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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
533 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
794 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 ...
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1answer
465 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
173 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
4k 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
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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
602 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
197 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
2k 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
964 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 ...
0
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1answer
958 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
151 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
201 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
495 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 ...