Ethernet at 1000 Mb/s (1 Gb/s). Can be over copper or fiber. There are different types of fiber.

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Ethernet switch signal quality

Is there a (significant) signal quality difference between ethernet switches? n other words: A 1000base-t, do some switches allow longer cable runs than other switches?
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21 views

Ethernet to Fiber Converters, reliable? or maybe better solutions

Not sure if this is relevant to ask here ... but I cannot find any information on the net about it. But here goes: Today I have a fiber that comes into building B from A(I have no control here. Lets ...
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1answer
35 views

How to change the setting for a network device reported by ethtool, specifically Speed, on VM?

This is related to these two questions, although they don't answer my question. The machines are RHEL6. 1.ethtool not showing all the properties 2.changing network speed to 1000Mb/s Output on VM: ...
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1answer
24 views

Broadcast stop via loopback kills bandwidth

Why does creating a broadcast storm by directly connecting two ports on a switch cause the bandwidth to all the other ports to cease?
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0answers
117 views

OpenVPN connects and disconnects on Gigabit network

I'm using OpenVPN Client 1.5.6 and use Windows 8.1 64-bit. The switch and router is running in Gigabit speed. But the connection to the VPN server goes up and down all the time (TAP-Win32 Adapter ...
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1answer
105 views

Why are we having problems with multiple nics in office and production networks going to 100mbps mode?

updates and additional info 2 environments, office and production at datacenter Both environments have Cat-5e cables, a cable was replaced when it tested as bad with Broadcom's cable testing, and ...
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1answer
222 views

Viability of Mac OS X 10.9 Time Machine Server in office environment

Currently we have about 20 Mac OS 10.9 MacBook Pros (almost all with SSDs) backing up to individual USB drives. I'd like to consolidate these to one drobo thunderbolt drive array attached to a Mac ...
2
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4answers
337 views

1GB dedicated port

I'm in the process of selecting a dedicated host for a big data project deployment. I need my servers to be well connected with each other. One of the provider I'm investigating is serverloft. Here is ...
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2answers
177 views

Ethernet port not detected

I just added additional 1gb port to my existing 4gbs on my server. All 4 are placed on a NET CARD PCIE 1GB E1G44HTBLK 904223 INTEL and the additional one is connected to motherboard(S5520SC) ...
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2answers
352 views

Why single file transfer is not faster than 50MB/s over Gigabit LAN?

I ran some tests on our gigabit network. When I transfer a big file (10GB) from a windows 7 computer to another, the troughtput never exceed 50Mb (it start at 80MB/s for one second then slows down to ...
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3answers
278 views

testing network connectivity on a server with Gigabit Ethernet

I have a box with Gigabit Ethernet, and I'm unable to get past about 200Mbps or 250Mbps in my download tests. I do the tests like this: % wget -6 -O /dev/null --progress=dot:mega ...
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1answer
110 views

Maximum throughput on switch with different link speeds

While doing some benchmarking on a network app I discovered strange behavior that involves 100MBit and 1GBit ethernet clients connected through a switch (at-gs900/8e). I have one server (Gbit) and ...
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1answer
119 views

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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1answer
224 views

Poor performance when migrated Fast Ethernet to Gigabit network

I have very strange problem. In a office computer network with about 100 PCs with mixed Windows XP SP3, Windows 7 and some Windows Server 2008 R2, I've decided to upgrade the network from Fast ...
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0answers
120 views

bonding - balance-tlb and a mysterious ethernet packet with lots of 00:00:00

Whilst attempting to get bonding working with mode=5 (balance-tlb) it seems that the driver sends an ethernet packet with length 0x0060 and the data, payload is all zeros. I can't work out where this ...
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1answer
71 views

Gbps to 2 100Mbps clients

If I have a media server with a gigabit NIC connected to two 100Mbps xboxes on a gigabit switch, will both receive from it at 100Mbps or will one connection put the server's NIC in a 100Mbps mode and ...
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1answer
140 views

Debian Dmesg Error - What does this output mean regarding an outage on eth1?

The tale of the NIC that quit; I have chucked the end of dmesg output from a server into pastebin; This server (PowerEdge 1850) has two NICs, eth0 and eth1. eth1 has a couple of VLANs defined on it, ...
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2answers
257 views

ethernet cable is connected but It shows unplugged [closed]

I told datacenter too connect two of my servers with a crossover cable to each other. But when I try this command ethtool eth0 Settings for eth0: Supported ports: [ TP ] Supported ...
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2answers
242 views

What is a reasonable latency time for mpdringtest with gigabit ethernet?

Hi I have a small test network that I'm using to do some number crunching for my dissertation. My network consists of three machines with intel gigabit network cards (all em drivers with two hosts ...
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1answer
149 views

How do I calculate the ethernet NIC-to-NIC time to send a MTU packet (1500 bytes)? (OS-excluded) [closed]

I understand it will depend on the speed of the ethernet 10 Mbit to 100 Gbit. Given an ethernet speed, how do I calculate the time spend in the wire from NIC-to-NIC? I am assuming here that the ...
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0answers
1k views

Issue with Netgear GS108T Managed Switch and Jumbo Frames

I recently purchased a Netgear GS108T managed switch and I am trying to configure jumbo packets between my NAS (Thecus N4100Pro), PC and managed switch. I should mention the fact that I was able to ...
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2answers
121 views

Cisco sg100-08 connections

I have multiple computers, some have a 10/100 ethernet adapter while others have a 10/100/1000 ones. If I connect them together with the Cisco sg100-08 switch, do I keep the 1Gbit speed where possible ...
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1answer
172 views

Why cant I transfer files from my desktop to my server at full speed?

I have a desktop computer with two SSD's in RAID 0 with a read/write speed of 950 MB/sec (7.6 Gbps) and I have a server with 6 HDD's in RAID 5 (read/write speeds of 200 MB/sec or 1.6 Gbps) acting as a ...
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0answers
256 views

Do Gigabit ethernet single-mode fiber network adapters exist?

I am attempting to set up a server with a total of four single-mode fiber ports - two need to be at least 1Gb and two must be 10Gb. I have found a variety of 10Gb single-mode fiber network adapters ...
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4answers
721 views

Long Gigabit Ethernet Run

I am trying to get an Gig-E network between two buildings that are approximately 260 ft. away. While some TRENDnet switches failed to be able to connect to each other over Cat 6 at that distance, two ...
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1answer
394 views

Gigabit Ethernet on 200 mbit/s speed - why?

Today I tried to connect two laptop computers, both having Gigabit Ethernet NICs, both with Windows 7, with straight cable cat 5e. The cable is ca 50 cm long so the category 5e should be enough. I've ...
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1answer
2k views

What am I misunderstanding about calculating MTU?

Okay, I just finished resolving a jumbo frames issue between a few Xserves, a Netgear GSM7224, and a Drobo B800i. It turned out that the Xserves (Mac OS X 10.6.8 Server) and the Drobo B800i accept the ...
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1answer
470 views

Is 1000 Base SX fiber multimode (850nm) backwards compatible with 100 Base Sx fiber multimode (850nm)?

Is 1000 Base SX fiber multimode (850nm) interface backwards compatible with 100 Base Sx fiber multimode (850nm) interface?
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1answer
5k views

Max distance for cat5e in 1000Mbps / 1 Gigabit

What is the max distance for cat5e cables in 1000Mbps (1 Gigabit) Full Duplex mode?
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1answer
496 views

'Gigabit' Ethernet Port Tester? [closed]

A quick google search shows there seems to only exist handheld testers for 10/100 Ethernet ports. Any ideas why that is and where we could find one that works with a Gigabit LAN? Perhaps the 10/100 ...
1
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1answer
172 views

Performance issues with self-built NAS

I set up a little NAS system for my personal use. It's an Ubuntu system running on a fan-less Atom-powered mini ATX mainboard which I extended with a usb3 pci card to get best possible performance for ...
3
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3answers
176 views

What could cause two devices to refuse to link?

This is a curious case where all the devices at hand will link with one another, except for two that just won't detect one another. One device is a single board computer (SBC) with a gigabit nic, the ...
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1answer
169 views

Is it possible/likely for a faulty network card (gigabit ethernet) to crash your consumer-grade router?

After much messing around with what appeared to be 4 faulty routers in a row I realized that I can reproduce causing my DLINK DIR-655 router to freeze up and require a hard reboot (to factory ...
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1answer
104 views

PCI Extender and 1GB Ethernet Performance

One of my server has 2 PCI slots which has already plugged with 1GB Ethernet cards. I want to add two more 1GB NIC to this server. I've found on ebay this pci extender. I want to ask, because I ...
4
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1answer
571 views

1000 Mbit/s fiber switch to 100 Mbit/s fiber switch - no communication

This morning, I troubleshooted a fiber connection between two switches in the same building. It was a single-mode fiber. I knew this fiber was fine, because I had installed it myself and tested (with ...
4
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1answer
10k views

Can't set up NIC to establish Gigabit link on Linux

I have Ubuntu 11.10 64 bits with one (actually two, but only one is connected) Intel 82578 Gigabit Network Card which is working on 100 Mbps and I want it to work on 1000 Mbps, but I can't. How can I ...
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1answer
401 views

2 NIC's are not loading by the Ubuntu Server

I have a Server with 5 NIC's. And I have just installed Ubuntu Server 11.10 64 bit fully dist-upgraded by now (31 Jan) 3 NIC's are identical PCI-Express x4 adapters. 1 is integrated TG3 and the last ...
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4answers
2k views

Having an issue trying to get Gigabit speed across my network (Ubuntu Server)

I've just started looking into the network speeds at my office, the entire network is setup to be "Gigabit". This includes Gb switches, Gb Network cards and Cat 5e cabling. I'm not expecting the full ...
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1answer
5k views

ZFS and FreeNAS Performance

I have just set up an HP Micro Server N40L as a FreeNAS with 4 2tb drives in a RAIDZ. I am getting around 30-40MB/sec, with occasional bursts of 50MB/sec., reads and writes that are similar to the low ...
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3answers
940 views

Cascading gigabit switch (10/100/1000) with fast ethernet switch (10/100)

I'm a newbie in networking. I have this question in mind lately. I bought a gigabit switch and tried to cascade it with my existing fast ethernet router and switch. I have 1 server which is connected ...
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1answer
570 views

Recommend a nice managed Top Of Rack switch for Linux Computer Cluster (but it has to be cheap!) [closed]

I work at an industrial research lab, and we have a research group that's building up a Linux-based compute cluster. The have about 46 nodes so far, with more to come. They came to us a few months ago ...
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3answers
432 views

Disable gigabit ethernet throttling?

I've got two windows PCs connected by gigabit ethernet. When I use iperf to measure throughput it maxes out at a good 100MBit/s. When I run iperf using two or three parallel connections, each will ...
0
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1answer
122 views

Web server to DB server connection speed [closed]

we are designing a cluster of 2xnginx, 2xapache, 2xmemcache, 2xmysql servers for a high traffic web site. Current web site runs on 1 dedicated web server and 1 dedicated db server. the current web ...
2
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3answers
4k views

iSCSI Transfer Rate Using Standard Gigabit Networking

We just purchased a dell storage server with (12) 7200 RPM SATA drives running RAID 10 and (4) gigabit network interface cards. Additionally it has a PERC H700 controller card with 512MB of on-board ...
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5answers
430 views

Cisco 3750 Gigabit ports

I'm looking for Cisco switches that provide 48 Gigabit ports. I've been through this list : CISCO PRODUCT REFERENCE and this one: DETAIL 3750 SWITCHES But there's something I don't understand: ...
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2answers
3k views

Best practice to trunk two GB switches?

I already read some similar questions but I still have no clue on how to do it the right way. I have a D-Link DGS-1248T 48 port GB-switch with 4 mini GBIC ports and I want to connect it to another ...
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2answers
488 views

Link Aggregation And Jumbo Frames configured but not working

I have a netgear GS110TP smart POE switch which is connected to a dual port INTEL PRO/1000PT with static link aggregation configured on the switch and PC side. The network card and switch recognize ...
7
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1answer
784 views

What is theoretical maximum of TCP traffic over GigaEthernet?

What is theoretical maximum of TCP traffic over GigaEthernet ?
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757 views

Slow network transfer on gigabit between Win7 and Unbuntu Samba (26 MB/s)

I have slow network transfer speed (26 MB/s). The beginning of the transfer started at 120 MB/s and dropped down every second. I am transferring a 350 GB file from an E-Sata (7200rpm) drive mounted ...
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2answers
314 views

Managed switch, what is the purpose of the two gigabit ports?

We have a managed switch that has been installed by phone engineers as part of our new IP phone system. The switch in question is a Nortel 2550T-PWR Ethernet Routing Switch 2550T-PWR with 24 ...