Questions tagged [ethernet]

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

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How can I change the cipher suite on wpa_supplicant

I started to use wpa_supplicant to configure a MacSec connection with another computer, the problem is that there are several options that I do not find in the template of wpa_supplicant. https://w1....
RandomUser8888's user avatar
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1 answer
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Make a completed Ethernet cable snagless after it was crimped

If I have an Ethernet cable with RJ-45 connectors crimped on both ends and having no snagless boot protection, what are my options for making the cable snagless after the fact? Sure, if the RJ-45 ...
Regus Pregus's user avatar
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Automatically change gateway based on internet connection

I have 2 connections to different internet providers in my Debian 11 system, I need to set the eth0 as the default and if it loses internet for any reason, change to eth1. After that if eth0 gets ...
Lucas Sanchez's user avatar
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3 answers
2k views

No Wired Connections in Ubuntu

I recently installed Ubuntu desktop 23.04.3 on a ThinkSystem RS630 Lenvovo server. I have connected the server to my a working ethernet cable but I get no Wired Connection options on the network ...
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List of supported devices and drivers for ethtool --cable-test

I want to use ethtool to test a network cable with ethtool --cable-test and ethtool --cable-test-tdr. I tried to do this (as root) on my machine (internal network adapter), two USB-to-Ethernet ...
TNT2k's user avatar
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How can I connect two switches with the STP enabled over one port, and without blocking ports

I have a question, if I want to connect two boards and each board has internal switch(like below topology), as you know that in general, the switch might have STP(Spanning Tree Protocol) enabled in ...
Jacky Lee's user avatar
6 votes
1 answer
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Can I connect two Ethernet ports on the same adapter on the same host to test to check port performance and perform stress test?

I have one Ethernet card with two 10G ports. I cannot verify the port performance and do a stress test by card to card with different systems. I would like to verify the port performance and stress ...
Jacky Lee's user avatar
-2 votes
1 answer
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How do I set up multiple networks to 1 computer with 4 ethernet cables with quad-nic (IS SOMETHING POSSIBLE?)

I'm not going to act like I know what I’m doing because obviously, I don’t. Complete n00b here. So let's start with this. I have 4 networks. All 4 have their own router and switch. Mega Computer has ...
Junior Oh's user avatar
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How to include network drivers in the initramfs for PXE booting?

I am working on setting up PXE Booting on a HPE ProLiant DL360 Gen10 Server. The server has a HPE Ethernet 100Gb 1-port 842QSFP28 Adapter for the network interface. We have a custom linux kernel that ...
Sâu's user avatar
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How to prevent ethernet issues after command line shutdown in CentOS7?

I'm running into a frustrating issue with a system running CentOS7. There's an Intel NIC (Intel Corporation Ethernet Connection (2) I219-LM (rev31)) which, when working, provides a 1000Mb/s connection....
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A gateway of 0.0.0.0 gets added in my linux machine after I assign a static IP and static gateway

I am assigning static IP address on a Linux module (custom Yocto Distribution on TI AM3359 custom hardware) using the ifconfig command. sudo ifconfig eth1 10.11.3.80 netmask 255.255.248.0 sudo route ...
Aditya Kumawat's user avatar
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nftables masquerading is not working

I've a laptop (172.16.0.2) and a desktop PC (172.16.0.1). The phone is connected to the PC in USB modem mode, and it appears as the enp5s0f3u1 interface. I've set up masquerading through nftables so ...
BlitDev's user avatar
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USRP N210 on a vmware debian machine, connecting via an ethenet to USB adapter

For a professional project, I must fully automate a process which involves a GNURadio python flow played on an USRP N210. In order to acess the USRP, I installed a VMWare Debian machine on a Windows ...
lucas auscher's user avatar
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SSH Ethernet Forwarding Does Not Seem to be Working

I have Ubuntu 22.04 on both the client and server. I have set PermitTunnel yes in sshd_config in both the client (I might not need it on the client) and the server. I have also set Tunnel yes and ...
falhumai96's user avatar
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Cat6e Lan Ethernet Cable - Disconnect when shake in Gigabit Mode. But it is stable when shake in Megabit mode [closed]

I have some problem in network connection. When I shake the lan cable at the wall jack, the connect will disconnect sometimes if the network is running in 1Gbps. But when it ran in 100mpbs, there is ...
steff chi's user avatar
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2 answers
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Splitter switch with multiple network

With an increase in informatics insecurity in companies, I try to increase the security of my network, but I encountered a problem trying to set up my ideas. Right now, each person in my company is on ...
Partodiam's user avatar
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1 answer
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Questions on 40GBe QSFP+ to 4X 10GBe SFP+ breakout cables

I run a small(~400cores) Linux cluster. I am using aggregated 10GBe ethernet ports(with Netgear XS728T), but now considering an upgrade to 100GB ethernet with QSFP28 ports(Mellanox SN2100). As I don't ...
Kyungrae Kang's user avatar
-4 votes
1 answer
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How many RJ45 outlets is too many?

This is going to be a silly question. Good friends of mine are opening an ophthalmologist office, and have asked me to provide input on their plans for the IT network. I'm a cybersecurity expert, not ...
Executifs's user avatar
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LWIP TCP SERVER Hangs

I'm using LWIP v2.1.3 with TI F28388D Controller. I'm using LWIP as TCP server only mostly in ping-pong mechanism like : Client Server PSH--> <-- ACK <-- PSH ACK--> A windows client(...
Pranay Gupta's user avatar
1 vote
1 answer
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Ping with jumbo frames fail but returns default ping fail message

I need to set up a local connection between my Windows 11 PC and an external device (IP 10.0.0.10), with jumbo frames enabled (MTU 9000). The end goal on my PC is to connect to the remote device from ...
C. Crt's user avatar
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What is causing large TCP messages to have low throughput in one direction when using ethernet-to-wifi bridge?

I have two computers, Orin and NUC, which are connected via ethernet cable directly. NUC is connected to a router with internet via WiFi (for completeness, not relevant to problem, I hope), and is ...
Joshua O'Reilly's user avatar
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iproute2 and netplan configuration

I want to use 2 network interfaces, each one has its own default gateway, at the same time. I found on google that iproute2 program could solve my problem but I also have to config netplan in order to ...
God of Money's user avatar
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On Linux, how to send packets with local destination NOT through the loopback interface

I have a Linux server with two ethernet interfaces which are connected to the same switch and are in the same subnetwork. The topology is as following +--------------------+ | | | ...
Donlon's user avatar
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2 answers
750 views

Can you connect two PC ports with different subnets to one unmanaged switch?

We're in the process of designing a machine with a Windows PC inside its electrical cabinet (a Beckhoff IPC like this one). Among other things, there will be some GigEVision cameras connected to that ...
relatively_random's user avatar
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Piping data from ethernet to serial and back to ethernet doesn't reach destination

CONCEPT VISUALIZED I'm trying to establish a bidirectional communication where ethernet UDP packets enter a linux system (suppose a Raspberry pi) from eth0 interface and piped into the UART hardware ...
zanglorion's user avatar
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2k views

how to configure a network interface on ubuntu server 22.04 lts?

I would like to configure the ethernet network interface of a server but I am completely lost. I saw on the internet that you could do it with the nmcli tool but also with netplan, I saw some people ...
Karichi's user avatar
1 vote
1 answer
121 views

Ethernet connection disables WIFI

Our company makes a 3d printer built around a Jetson Nano. The printer connects to the internet using a wifi dongle, but for the initial setup the user must connect to the printer using an ethernet ...
Peter Davis's user avatar
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Connecting iPad Pro to the internet via Ethernet

Okay, so you would think my client wanting to get an iPad online via ethernet would be simple and straight-forward way for me to earn $20. When I arrived, this is the setup I found: The iPad Pro (...
Aleister Tanek Javas Mraz's user avatar
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How to keep IP address when ethernet cable unplugged linux?

My board has wlan0, ppp0 and eth0 interfaces and I always want to keep my IP address on eth1. How can I do this?
selcuk gok's user avatar
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1 answer
151 views

How to ping backup interface?

this is my network configuration: bond interface 192.168.101.50/24 has two salaves: eth1 (192.168.101.1) that is connected to 192.168.101.2 and eth2 (192.168.101.10) that is connected to 192.168.101....
raffaeledp's user avatar
1 vote
2 answers
78 views

Is it possible to connect two AUI transceivers?

I have a system which has a proprietary internal network and provides an external AUI. I cannot find a switch or hub with AUI port. Are whose hubs/switches with AUI port still around? In general a MAU ...
Florian Zidar's user avatar
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2 answers
741 views

Unable to ping other devices in the network through ethernet port on a custom board

I am on a embedded development platform and trying to bring up the ethernet and do a ping test. As of now, I have the ethernet up after the linux boot, but I am unable to ping other systems. My ...
user2532296's user avatar
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61 views

Is there a registry value to force a connection to close?

I have an ethernet connection that I want to close if it's not sending or receiving any data. Is there a registry value I can set or any configurations I can change? For windows 10, thanks Edit: ...
user1416658's user avatar
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1 answer
513 views

Will devices with different auto negotiation settings on switch ports with matching auto negotiation settings communication issues between them?

I ran across this idea today and had conflicting opinions on this from various co-workers. I am trying to understand if the communicating devices' auto negotiation settings need to match each other ...
Paj's user avatar
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1 answer
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Simple way to secure a wired link with 802.1x in "peer to peer" mode without server

I have an Ethernet link between two Linux hosts with a static IP config using systemd-networkd on the both sides without router, DHCP server, etc. Is there a simple way to add a basic 802.1x security ...
Emeric Verschuur's user avatar
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1 answer
124 views

Access mysql from another computer connected with crossover cable

I have two computers, and i am trying to access mysql via network on port 3322 (mysql listens on this port) Computer A Server: Windows 10 home Added firewall exception to port 3322 (mysql installed ...
Smith's user avatar
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1 answer
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Can't connect ssh via wireless interface but t works using eth0

Suddenly I can't connect via ssh to a server using my wireless interface but I can do it using the eth0 interface with a cable connected directly to my router. From my wireless interface I got: $ ssh -...
yucer's user avatar
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Can ping OPC UA server, but cannot connect to it

I have an OPC UA server running on a PLC from BR Automation and would like to connect to it from UaExpert running on a Windows 10 machine. It has worked previously, but after physical re-placement of ...
Dave's user avatar
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0 answers
410 views

Accessing Marvell switch via remote management interface

I have 88E6341 Marvell Ethernet switch. I cannot access its MDIO and according to the datasheet the switch has remote management via Ethernet which I'm interested to use to diagnose connectivity ...
jackhab's user avatar
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2 votes
0 answers
657 views

How to simulate what happens inside the packet buffer of a simple switch?

I'm debugging a case of UDP packets lost in a store-and-forward gigabit switch and I wanted to visualize what happens inside the switch to better understand the gist of the problem. The scenario is ...
Martin Pecka's user avatar
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Event driven way to detect Ethernet port status changes (disconnected / 10mb / 100mb / etc) in linux?

I was wondering if linux has some sort of interface to detect ethernet port state changes via /sys or some other way that is event driven. What I mean by state changes is DISCONNECTED / 10mbit / ...
anonymous-one's user avatar
1 vote
1 answer
1k views

Filtering traffic between ports on an ethernet switch

I would like to know if there is a standard way of limiting traffic between ports on a managed Ethernet switch? I have a 7-port Ethernet switch (microchip - KSZ9897), which is a layer 2 switch, but ...
Lunde's user avatar
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1 answer
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Limiting hosts on a network

I am in need of some networking advice and hopefully some of you will be able to help me. My network is shown in this block diagram: The ethernet switches are from Microchip, model KSZ9897, which is ...
Lunde's user avatar
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9 votes
6 answers
2k views

What Ethernet twisted pair cable is best with a particular Ethernet switch

tl;dr I want the appropriate Ethernet cable for my Ethernet switch. How do I correlate Ethernet cabling speeds measured in hertz with an Ethernet switch "speed" measured in bits-per-second ...
JamesThomasMoon's user avatar
0 votes
2 answers
2k views

Onboard ethernet versus Intel NIC

I would need some recommendation about the benefits of using a dedicated Intel Ethernet card versus simply using the integrated Ethernet of the motherboard. The typical use case would be the following:...
Henry's user avatar
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0 votes
3 answers
493 views

Network layer communication with multiple hosts with the same IP but different MAC addresses

Due to an unfortunate (mis-)configuration issue I am having ~100 hosts of which the IPv6/IPv4 (even the IPv6 link-local) addresses are all the same and which for the moment I cannot change. However, ...
Simon Fromme's user avatar
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2 answers
806 views

Gateway with multiple VLAN IPs on one NIC

I would like to separate several hosts from the local network and put them behind a firewall. I would like to use VLANs to "physically" separate them instead of using just different subnets. ...
user236012's user avatar
-1 votes
2 answers
157 views

Mac can be arpinged but not pinged

Why does Mac OS X and Linux do not ping each other on a local Ethernet Network? Edit 2012-12-14 (ten days latter) adapter FireWire to Ethernet RJ45 might be the problem (on MacBook Pro Retina early ...
Bruno Schroeder's user avatar
18 votes
4 answers
2k views

What can cause network packets consisting of PUU?

We have a system which is suffering from comms outages on a gigabit ethernet network. The traffic load on the network is such as to slightly stress a 100Mb network, but there are gigabit switches and ...
AlastairG's user avatar
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0 votes
1 answer
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Raspberry Pi as internet forwarder [closed]

I thought about building a device that will behave as a forwarder with VPN. I know that I can e.g. take the internet cable, connect it to rpi, turn on vpn and create wifi hotspot. But I wanted it to ...
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