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Questions tagged [ethernet]

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

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How to view current PHY master-slave settings in Linux (Centos Stream)

I am trying to view the current master-slave settings on my network cards (HPs with Intel controllers). I see ethtool has the master-slave option to set the mode, but I didn't see how to view the ...
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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 -...
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net server ip connection fail etimedout

I use nodejs net (https://nodejs.org/api/net.html) to connect pc as client to server via ethernet cable. The app connects well from one pc to server (ip 192.168.100.150:1025), but it does not connect (...
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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 ...
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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 ...
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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 ...
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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 / ...
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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 ...
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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 ...
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9 votes
6 answers
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What Ethernet twisted pair cable is best with a particular Ethernet switch

tl;dr I want the best supported 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-...
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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:...
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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, ...
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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. ...
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-1 votes
2 answers
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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 ...
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18 votes
4 answers
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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 ...
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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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-1 votes
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Converting phone wall mount to ethernet mount [closed]

I currently have a telephone wall mount. 1 near the router, 2 more in another 2 rooms. When I remove the wall mount, I can see 4 wires from the cable. Red, Blue, White and Grey. My question is, can ...
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Is there a way to configure port security on Linux bridge?

On switches there is such a feature as Port Security. Roughly speaking it allows to control, which exactly MAC's can be on the specific switch port. You can restrict it to just one MAC or several, and ...
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2 answers
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Can tone ethernet cable into patch panel but it's not working

So we recently had to two major issues happen at a location. We had a lightning strike hit the building We updated switches after this lightning strike Now one thing that was 'hit' was a SOHO router....
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2 votes
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No responses to ARP requests

One of my server's physical interfaces eno3 is part of a bridge br0. There is also one LXD machine attached to this bridge (nictype=bridged, parent=br0). Sometimes ARP stops functioning completely. If ...
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Security issues with configuring default IP address(0.0.0.0) to ethernet interface

In our linux embedded application we would like to keep available ports up and running and assigning with 0.0.0.0 IP address. In short we will be executing all ports with ifconfig ethX 0.0.0.0, and ...
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SQL server connection TCP/IP overt Ethernet [closed]

I have two PCs. There is SQL Express installed on one of them. TCP/IP settins are here: tcp/ip settings tcp/ip settings When I perform Test-NetConnection on local computer I get But when I do it ...
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1 vote
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How to manually setup Whonix networks for QEMU?

I would like to run Whonix directly using QEMU instead of using libvirt and I want to manually setup internal and external network. Using libvirt I would need to run those commands: virsh net-define ...
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Is there exist in a market some usb->ethernet->wifi combo dongle?

I have a USB-ended device which I want to connect to Enterprise Wireless network (EAP/TLS via FreeRadius). Is there any device in a market which can act as a WiFi client with EAP/TLS possibility? Now ...
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Qlogic QLE8152 connect to a DS14 disk shelf

I am trying to configure a NETAPP DS14 disk shelf to expose the drives to a windows or a linux machine, I don't have a controller but I got a FC to ethernet adapter (Qlogic 8152) however the loop does ...
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Ethernet/UIB device is accessible on one system but not the other (Linux)

A Universal Interface Board connects to the computer via Ethernet. On a correctly configured system (A), arp -a lists its MAC address and establishes a connection. The connection appears to happen ...
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1 answer
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Windows 10 multiple Ethernet connections with one being connected to the internet but PC doesnt connect to the internet [closed]

I have a win10 machine in a rural area with no ability to connect to a private network. The computer is used to track measurements of specific sensors which are connected with ethernet to the computer....
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1 answer
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A simple configuration: LAN + direct connect simultaneously [closed]

This should be an easy configuration, but I'm struggling to Google for it; the vocabulary eludes me. I've got a desktop with onboard gigabit which finds its way to the internet via the router. ...
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2 votes
1 answer
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My network interface changes names, so DHCP / dhclient cannot operate on it

On some ArchLinux servers I've switched from dhcpcd to dhclient, but the servers are not receiving IP. Upon inspection with journalctl I see that, on all occasions the IP was not received, dhclient ...
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1 vote
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Ubuntu Ethernet Duplex setting fault

I am trying to connect my Ubuntu 18.0.4 hardware to a managed switch that has the duplex set to Full and speed set to 100. The Switch cannot be configured to Auto mode because it is customer ...
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Is it possible to update HP/Intel NIC firmware?

Is it possible / how to update the firmware (EEPROM image) of Intel Gigabit ethernet cards? I have multiple HP NC365T NICs based on the Intel Corporation 82580 Gigabit Network Connection. Some of them ...
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Abnormal port request on Linux system

I am using Debian Buster and Android 9. Checking the network activities I noticed that it scans many ports. How can I determine who is the cause or if this is normal? I connect the mobile phone to the ...
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1 vote
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Internet goes down when someone access our URL?

Setup: Have a metal server in our office closet, host OS is windows 10. It hosts 4 VMs, one of which is an internet facing application and accessible via URL. The server has 2 network cards, the first ...
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-2 votes
1 answer
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Can we have multiple IP addresses with different Net IDs on an interface? [closed]

Can we have multiple IP addresses with different Net IDs on an interface? Like a Network Card? For example setting up 192.168.1.2 and 18.170.2.5 on the same network card. If yes, where do we use this ...
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1 vote
1 answer
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Debian 10 backward compatibility with eth0

Noticed when upgrading to Debian 10 (Buster) that the public eth0 network interface is now called ens5 on AWS EC2. Is there a way to create a symbolic link or similar so that legacy applications that ...
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Ethernet bond interface fails after NIC replacement

I've replaced a failing 10GbE adapter in a Dell PowerEdge server running a bonded pair of Cat6 cables to an aggregate switch. The old NIC and its replacement are both Intel Ethernet Controllers (10-...
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1 answer
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Use ethernet port for smb share transfers, but smb should still be accessible over wifi [closed]

I'm pretty new to Linux networking and I'm not sure how to fix a file transfer issue I have. I have two Raspberry Pis. One is running Raspberry Pi OS and the other is running OSMC. Both are connected ...
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1 answer
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LAN cable-tester's LEDs fire at 3 and 6 (without passive side attached)

I have hardware question. I am running a duplex CAT7 cable from a patch panel to a wall socket. One connection works, the other struggles when I test the cable. Below I describe how I tested the cable ...
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1 vote
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Bringing interface up without a cable (but bridged VMs)

I've set up a bridged network vm (i.e. virtual network hub, vm:192.168.1.2, host real network card: 192.168.1.1) There's no network cable. As I do not care for one on this host->vm setup. The vm ...
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stp - avoid links with packet loss

We have a set of devices connected in a ring, that are using stp (using https://github.com/mstpd/mstpd at the moment) to avoid issues with the loop. What we have seen, is that while stp can adapt the ...
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2 answers
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Are Dell parts compatible with non-Dell hardware? [closed]

I could not find the answer... I'm about to buy this piece: https://www.dell.com/pt-br/work/shop/intel-x710-10gb-sfp-mezzanine-adaptador-e-porta-dupla-da-dell/apd/555-bdpg/equipamentos-de-rede Will ...
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Ethernet frames duplication when using VLAN interfaces

I have three processes on linux machine: First is using socket, which is bound to all network interfaces. The second is sending ethercat packets by using broadcast (ethercat doesn't use IP layer). ...
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1 vote
2 answers
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Identify cat5 and cat5e wiring visually

I have some network cabling running in the house. I wanted to know if they are cat5 or Cat5e. Unfortunately I don't have access to the part of the wire where it's written. Mainly I want to run gigabit ...
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Debian Web server with dual ethernet

Diagram Hi all, I have a web server (debian 9) and 2 internet line, I want to public website on both lines to do HA, I already configured nat on both FW. Tested for each line alone is ok but I can't ...
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Analyzing an ethernet cable for low negotiating speed

I'd like to find out why my cat 6a refuses to negotiate 1000 speed. I have a 15 meter long U/FTP CCS cat 6a Ethernet cable installation. I have analysed the cable with a multimeter and each strand (...
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Why is my client still talking to my server when I change client IP to different subnet? [closed]

On occasion, I'm using a Verizon Mifi adapter to share an internet connection over my office network (which doesn't have internet). To do this, I have to share the internet connection on the adaptor, ...
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-2 votes
1 answer
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Bufferbloat : Why not just have super large buffers? [closed]

A bit of a big picture question here but I was wondering what was the logic behind not just having incredibly large network related buffers? One would think that getting as much of the data as close ...
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-2 votes
2 answers
135 views

how to connect reverse proxy Server [closed]

I have an IIS-ARR LoadBalancing server connected to internet. And I have 2 IIS web servers in a LAN (using a switch) without internet. The IIS-ARR is configured as reverse proxy for 2 websites www....
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1 vote
2 answers
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Ethernet is disabling WiFi [closed]

We are working in iMX6 board running in Yocto 4.9.88 build. It has both Wifi and Ethernet connections. When we connected WiFi alone, pinging is working properly. Pinging works if we connect Ethernet. ...
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Dual NIC silently rejecting all incoming traffic from one interface

In my server, I have two ethernet cards: enp0s17, local IP 192.168.0.7, router's public address x.x.x.x, netmask 255.255.255.255 enp0s18, local IP 172.16.0.7, router's public address y.y.y.y, netmask ...
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