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Questions tagged [ethernet]

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

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

Originally designed in the 1970s, Ethernet had a data rate of 10 megabits per second. Later, Ethernet was extended to support rates of 100 megabits/second, 1 gigabit/second, 10 gigabits/second and 100 gigabits/second.

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Connecting two buildings, 250 meters, heavy snow country, high lighting risk

I will have a new fiber optic Internet connection coming in to building A, and need to set up an access point in building B. Both are commercial buildings. The fiber Internet is currently 20 Mbps, but potentially up to 1000 Mbps. The buildings are…
Bryce
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Why do we need a LAN physical interface bridged with OpenVPN TAP interface to get functional OpenVPN in bridge mode?

Here I have some (slightly maybe different) questions, but related to each other, therefore I prefered to ask them in one question. I have been trying to allow my OpenVPN clients (OpenVPN is setup in bridge mode) to connect to Docker containers. As…
Mohammed Noureldin
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Use of unused pairs in cat5 ethernet cables?

Cat5 ethernet cables use only 2 pairs for Ethernet what are the other 2 pairs for ? Pin Color Function 1 White with Green +TD 2 Green -TD 3 White with Orange +RD 4 Blue Not Used 5 White with…
Ravi Teja Bonam
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100BASE-FX single-mode, confusing distances

I'm new to Ethernet over Fiber, so please bear with me. According to the standard, 100BASE-FX over SMF supports distances up to 10 Km. Technical documentation of some products states support for 100BASE-FX with typical distances of up to 40…
H_squared
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Is a DCB switch required for a FCoE setup?

I'm looking to play around with a test Fibre Channel over Ethernet (FCoE) deployment between 2 Xen servers and 1 storage server. Eventually I plan to replace our ageing NFS shared storage solution. Is a DCB compatible switch strictly required? I'm…
Michael P
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Network cabling Tips

I'm looking for some useful information about how to design network cabling for a building. I'm not so much interested in wiring standards such as 568A, but more interested in physically wiring the building. For example: Is it better to have all the…
Bryan
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Is the 64-byte minimal Ethernet packet rule respected in practice?

A quick WireShark scan of my network interface reveals a bunch of Ethernet packets which are less than 64 bytes in length. I know that WireShark strips off the trailing 4 byte CRC, but I still see some ARP packets with 42 bytes, some IGMPv3 with 54…
Randomblue
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Effect of reversing a pair, in cat5 cabling (e.g. swapping stripe and solid)

Is there any practical effect of reversing solid and stripe, when wiring cat5 cables? But if I've got a cable where each pair is a pair but one end is flipped, will this make any practical difference for 100BASE-TX? For 1000BASE-T? For POE…
Bryce
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Is it possible to receive dhcpdiscover from ff:ff:ff... mac address?

Today I saw this record in my log files: dhcpd: DHCPDISCOVER from ff:ff:ff:ff:ff:ff via vlan400: network 40.60.100.10/24: no free leases …
Korjavin Ivan
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Is it possible to mix jumbo frames VLAN and standard mtu VLAN on the same switch port?

If a managed switch and all attached devices both support VLANs and Jumbo Frames, is it possible to mix VLANs with jumbo frames and VLANs with standard frames on the same switch port / ethernet card? If it is possible, should I expect it to work in…
Luke404
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Client not getting address from some DHCP server

I'm working on some embedded devices which should be connected to a large network (hundreds of devices) via ethernet and that should be configured using the DHCP protocol. What I'm experiencing is that apparently the devices get the address in some…
Luca Carlon
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testing signals on an ethernet cable

I work on escalators that use ethernet cables to send signals from "nodes" to a PLC. the only tool available is a Fluke multimeter. is there a way of reading these signal using the meter? or do I need different tools/meters? is the signal a voltage…
bill
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Very low throughput on 10GbE network

I have two Linux machines, each equipped with a Solarflare SFN5122F 10GbE NIC. The two NICs are connected together with an SFP+ Direct Attach cable. I am using netperf to measure TCP throughput between the two machines. On one box, I…
NPE
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Does using VLANs in your network infrastructure cause an appreciable decrease in performance?

This is something I've never considered before and wanted the opinions of the experts. We use VLANs day in and day out for various network tasks. My modus operandi is that in general, if something supports VLANs, that port is getting trunked…
Peter Grace
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Descriptions of Ethernet register/counter names?

Is there a manual/datasheet/some other resource that explains what do all these counters in ethtool -S mean? Some of them are self-explainatory, some aren't... I'm taking them from e1000e source code (ethtool.c). EDIT: just found and…
Martin Janiczek
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