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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1answer
102 views
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 & ...
0
votes
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, ...
0
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1answer
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 ...
0
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1answer
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-...
0
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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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0answers
163 views
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 ...
0
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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 ...
2
votes
2answers
56 views
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 ...
1
vote
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 ...
-1
votes
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 ...
0
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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?
3
votes
2answers
1k views
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 ...
-2
votes
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)
...
-2
votes
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 ...
2
votes
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.
...
2
votes
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. ...
2
votes
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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votes
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 ...
1
vote
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 ...
11
votes
5answers
65k views
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 ...
0
votes
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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votes
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 ...
0
votes
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 ...
0
votes
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 ...
3
votes
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: ...
3
votes
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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vote
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 ...
1
vote
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.
...
0
votes
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
...
0
votes
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?
6
votes
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 ...
0
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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?
0
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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 ...
0
votes
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:
...
0
votes
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?
1
vote
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 ...
2
votes
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
votes
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) ...
1
vote
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 ...
2
votes
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/...
2
votes
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 ...
4
votes
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 ...
1
vote
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 ...
0
votes
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 ...
