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Questions tagged [gigabit-ethernet]

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

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Trouble enabling Jumbo Frames?

I'm trying to enable jumbo frames. I have a linux client & a windows server. I've standardized across the board on intel nics. On the windows server the only choice for jumbo frames is 9014 & ...
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1answer
95 views

Load balancing multiple NICs on single machine presenting a virtual IP

I've inherited a network setup, where the NFS/Samba linux RAID server ("Ubuntu 14.04.5 LTS") is serving everything over one NIC. As a result, the 1Gb network bandwidth is saturated. Unfortunately, ...
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293 views

How is the Ethernet payload only max 1500, while I can ping with larger size packet?

Just recently I came to know that the payload of Ethernet is max 1500 bytes (mtu). The first thing that came to my mind was that we can ping with much more size than that. So I thought maybe the ...
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59 views

Had cat5e cable and got 1000mbps, upgraded segment of it to cat6, now limited to 100mbps [closed]

I have a setup in my home that goes something like this: [cable modem] -> [Netgear Gigabit switch UPSTAIRS] -> [Netgear Gigabit Switch DOWNSTAIRS] -> [Netgear Gigabit Switch OFFICE] -> [My PC] Now, ...
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2answers
152 views

Can a 24V 1Gbps Ethernet port start operating in 100Mbps mode if it was exposed to 48V PoE?

I have heard that a situation where a 24V Gbit Ethernet port was not completely fried after being exposed to 48V current, but downgraded to fast Ethernet - 100Mbps. Question: I that possible and ...
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0answers
323 views

DHCP not working on RTL8111 NIC (DHCP Offer not arriving at receiver)

I'm experiencing some strange behaviour with a Dual Gigabit Ethernet NIC; I've setup a computer which has multiple network interfaces to connect some industrial cameras and setup a DHCP Server (isc-...
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1answer
39 views

Ethernet switch with Infiniband uplink

There are Ethernet switches (copper based, i.e. with RJ45 sockets) that have Fibre uplink. Example: Netgear GS110TP Are there any such switches with Infiniband uplinks? If not then why?
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Why does my Realtek gigabit NIC not advertise 1000Mbit mode?

I currently have a NAS (openmediavault based on debian) with a Realtek gigabit NIC (ASRock Q1900-ITX on-board LAN), but it won't advertise that it is gigabit-capable. ethtool eth0 gives the following ...
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0answers
150 views

Bringing alive a I350 Gigabit network connection for Dell PowerEdge on Ubuntu using iDRAC

[Resolved]: The network cable had been connected to the integrated NIC physical interface, which although accessible, was no longer enabled. The problem was solved by connecting the cable to the ...
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1answer
177 views

Only one link comes up on dual PCIe 10-Gigabit card

Background A server running Ubuntu 16.04 Dell X520 (based on Intel's 82599) is connected via PCIe ixgbe driver was installed from here and comes up at boot Issue The card is recognized by the ...
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2answers
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One switch port suddenly no longer at gigabit speed

I've got this manageable switch : https://www.amazon.com/TP-Link-Ethernet-Sheilded-Replacement-TL-SG108E/dp/B00K4DS5KU/ in my network for about 3 months now. Yesterday I noticed that a computer ...
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1answer
297 views

How to enable ethernet 1 Gigabit advertising or troubleshoot the situation?

On an Debian Stretch box, I have a Gigabit ethernet network adapter, but this mode is not active (however displayed as supported). Does this depend on the peripheral condition (i.e. cable is not ...
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1answer
594 views

How to differentiate GE, Optic and FC adapter/SFP?

I'm going through old switches laying around and find myself troubled by all the different connection types the PCI adapters and their SFP have. I found a 10GE (gigabit ethernet?) SFP that says it's ...
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0answers
83 views

1000Mbps RGMII and 100Mbps PHY

An ARM SoC (Amlogic S905) indicates that the ethernet is 1000Mbps RGMII and 100Mbps PHY. Does that mean that the communication with the physical layer is slow?
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2answers
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What is bottlenecking my SMB share?

I set up a SMB/CIFS share on my FreeNAS box (Xeon E3-1220v5, 8GB DDR4 RAM) and I noticed that transfer rates are limited to ~70 MB/s, while I can easily get around 110 MB/s via WebDAV and using iperf ...
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1answer
72 views

Ethernet Router, switch and network routes [closed]

Say I have the following network setup with about 100 clients connected: 1 GbE Ethernet/Internet -> GbE Router -> 1 GbE Ethernet -> GbE Switch -> Clients Clients receive their IP:s from the router's ...
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2answers
65 views

Would an extra gigabit ethernet card improve server performance [duplicate]

my setup is the following: TP-Link TL-ER5120 Gigabit Load Balance Router The router has 2 WANs and 3 LANs connected to it: LAN 1 Cable goes to a TP-Link SG-1024 Gigabit Switch (24 gigabit ports) ...
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1answer
46 views

How did 10gbe happen without increasing the number of wires in the cable? [closed]

The ethernet cable speed jump from 100Mb/s to 1Gb/s was possible because all of the wires were put to use in a patch cable. The jump from 1Gb/s to 10Gb/s required no such increase. How did they do ...
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3answers
381 views

Ethernet cable lengths

I was recently installing some servers, and making the cables the right length so that everything in the rack was tidy. 2 out of quite a few links failed to operate at gigabit, degrading to 100mb. ...
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2answers
164 views

Can FOG and/ or WDS do multicast over an ordinary unmanaged Gigabit Switch? or does it need hardware with specific multicast features?

Can FOG and/ or WDS do multicast over an ordinary unmanaged Gigabit Switch? or does it need hardware with specific multicast features? Trying to help a small non profit in Asia with a poor budget. ...
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1answer
1k views

Ethernet cord not detecting in centos 7

Please help me out, the ethernet modules all are loaded but i could not find remaining the two ethernet ... [root@vpn ~]# lspci | grep -i ethernet 01:01.0 Ethernet controller: VIA Technologies, Inc. ...
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0answers
66 views

Throughput dropped when using two ethernet ports simultaneosly

I have a board based on Altera Cyclone V, its ARM SoC is clocked at 800MHz, the boardd has two 1Gbit/s ethernet ports. When I benchmarked the throughput of a single port using iPerf, I managed to get ...
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2answers
1k views

gigabit cat6 cable connecting 100Mbps only (Electrical interference?)

I have a gigabit switch and I am connecting my laptop to it using a cat6 ethernet cable. The problem is it is connecting to 100Mbps only instead of 1Gbps. This is what i found : The is a zone in ...
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0answers
751 views

Slow gigabit speeds with Ookla speedtest software

We have 2 speedtest servers (RHEL 6.7) sitting on 10GB links with a 10GB pipe between the two. The servers are separated geographically by about 256 miles but traceroutes look very good, with 4 hops ...
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5answers
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How many network switches can I daisy chain together [duplicate]

We have a number of custom computer systems that need to be networked and temporarily installed around a football stadium - each computer has it's own network switch. These computers all need to be ...
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0answers
183 views

Cisco 1000BaseT SFP modules in a 3750 overheating

I have a 3750 responsible for switching in my DMZ. Every once in a while one of the gigabit links will go down although ios and the server attached to it report the link is up (activity lights, etc). ...
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2answers
2k views

How to connect a SATA / ESATA / USB 3.0 device over Gigabit Ethernet

I am looking for a way to connect an 5.25 SATA removable drive bay from CRU to our HP Proliant 360 blade server. Unfortunately the server has no support for USB 3.0 and no free PCI slot to upgrade USB ...
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2answers
284 views

Multilayer LACP

I have a network switch that is limited to 2x1Gb/s LACP teaming, however have a file server with a 4x1Gb/s network interface. What options do I have to aggregate all available bandwidth without ...
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1answer
136 views

Can a faulty switch connected to the core switch block an entire network?

I encountered the following situation: The network I administer was blocked, and this was traced down to a specific rack, after I reseted both switches, everything worked. I supposed it was the core ...
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1answer
14k views

How do I increase the ring parameters for a NIC on a Linux server

I used the ethtool utility to increase the rx and tx values for the NIC on one of our servers. I ran the following command: ethtool -g eth0 Ring parameters for eth0: Pre-set maximums: RX: ...
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1answer
1k views

Any benefit and/or risk in enabling Jumbo Frames for the DAG replication network?

Exchange 2013 DAG, two nodes, a dedicated GBE network interface on each server for replication traffic, connected to a GBE switch, using a dedicated VLAN. Is there any benefit to Exchange replication ...
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2answers
1k views

Slow local area network speeds

Updated on 2014-10-09 Disclaimer This question is similar to Unexplained slow gigabit network speeds but because the latter is still unanswered after 5 years, and that I think I'm able to add more ...
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1answer
1k views

Connect access switches to router or core switch

My workplace consists of 4 access unmanaged network switches from three different computer rooms connected to a router. The router contains three 100mbps ethernet ports and one Gigabit (GigE) port. ...
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1answer
120 views

Is it possible to tell whether I am connecting to fast or gigabit ethernet with CAT5e cable?

My NIC supports gigabit ethernet: $ ethtool eth0 Settings for eth0: Supported ports: [ MII ] Supported link modes: 10baseT/Half 10baseT/Full ...
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1answer
478 views

Does 1 Gbps ethernet standard mean 1 Gb in both directions simultaneously, or 500 Mb in each direction? [closed]

What does the Ethernet standard dictate for the meaning of 1 Gb ethernet? Does it dictate full duplex 1 Gbps, or a shared pipe between the two directions?
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3answers
5k views

Gigabit uplink versus regular switch port

I have a 10/100/1000 24-port + 2 mini-GBIC ports switch which I have to link to other switches. Unfortunately, on the other switch all the mini-GBIC slots are taken up, so all I can do is link them ...
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1answer
164 views

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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3answers
347 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
695 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
105 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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1answer
135 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
553 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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3answers
1k 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
1k 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
4k 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
3k 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 http://proof.ovh.ca/...
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1answer
1k 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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4answers
1k 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
1k 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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1answer
104 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 ...