Questions tagged as ['ethernet']
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 current setting. When I try only "ethtool " it doesn't show any master-slave settings.
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 -vvv my_server
OpenSSH_8.9p1 Ubuntu-3, OpenSSL 3.0.2 15 Mar 2022
debug1: Reading configuration data /home/user/.ssh/config
debug1: /home/user/.ssh/config line 38: Applying options for my_server
debug1: ...
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 (etimedout) to server on another pc. First, I couldn't even ping the ip address of server, but setting on pc the ipv4 to 192.168.100.151 it could ping the server, but still got etimedout. From nmap this could ...
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 the components and installing a new ethernet cable, I cannot connect to the server any more:
GetEndpoints on EndpointUrl failed with 'BadTimeout', retrying on all DiscoveryUrls
Could not connect to ser ...
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 issues.
What SW tools can I use on Windows or Linux to access switch registers?
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 simple - two bursty data streams come through 2 ports inside the switch and both want to leave it via a third port (common to both). So the switch needs to hold some data in the packet buffer for a whi ...
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 / 100mbit / etc.
We could just pool the status of the port every X ms, but I was hoping on using inotify to watch for something that changes on the filesystem and trigger our action based on that.
We are actua ...
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 with IEEE 802.1X (ACL) and 802.1Q (VLAN) support. What I specifically need is the following:
I need to only allow traffic from port 1 to 2 for one specific IP address. The same from port 2 to port 1, o ...
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 a managed layer 2 switch. The switch has multiple features, for example it supports IEEE 802.1X (port-based authentication and Access Control List (ACL) filtering) and IEEE 802.1Q (VLAN). All hosts are W ...
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-second bandwidth?
There are several Ethernet twisted pair cabling standards; "Cat 5e", "Cat 6", "Cat 6A", "Cat 7", etc. each supporting a maximum length and hertz rating. For example, according to Wikipedia "Cat 5e ...
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:
- Payload of around 100 KB per message,
- Frequency of around 1000 messages per second maximum,
- Ideally, the handling of these messages should consume CPU time as minimum as possible (the CPU will be used fo ...
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, all hosts have unique and known MAC addresses and are in the same broadcast domain. Is it possible to communicate with the hosts individually and simultaneously on the IP-level by crafting the corresponding ...
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. My idea is to use a switch that supports VLANs, and build up the network like this:
P1 and P2, P3 and P4 are four different hosts that belong to two separate, "physical" networks (VLAN 1 and 2). They should be protec ...
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 2015). I am researching on how to debug the his adapter. Ethernet lights blink but I don’t know enough about this early FireWire.
With a simple Netgear four ports switch-hub, when connecting via RJ45 ca ...
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 NICs and cables throughout - or so I am told by the customer who built the network we are plugging into.
We plugged in a laptop running Wireshark via a 100baseT hub and found that it reported lots of ...
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 be more private device and I can't find any information if it's even possible. So I thought about connecting internet cable to rpi, turning on vpn and then connecting second internet cable to another etherne ...
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 this cable be converted to ethernet so that I can connect my pc in another room using ethernet straight to the router?
I attached some photos. Room Near Router
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 Ethernet frames from some new device will be blocked.
So is there a way to do it in Linux bridge?
This post didn't help.
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. After upgrading the server room, we realized that the port for this SOHO router no longer works. I toned the cable out fine but the replacement router (same make & model) isn't powering on. I've r ...
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 I look at a capture of traffic on the bridge br0, I see a lot of ARP requests from the server and VM, but no responses at all. This only affects IPv4.
Restarting the switch attached to eno3 doesn't hel ...
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 setting all IP address to virtual interfaces ethX:100 20.20.20.20 is there any security issues with configuring ethX to 0.0.0.0? Is there any other issue can be faced if we configure all IP address on virtual ...
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 from remote PC I get
As you can see tcp succeeds when connected over WiFi but fails over Ethernet. Ping is OK but TCP/IP connection fails. I tried many different ports with same results. I'd be grateful fo ...
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 this device connected to the network via USB-to-Ethernet adapter in a wall-mounted RJ45. Furthermore, is there any combo device in a market which can act as USB-to-Ethernet from one side and in the s ...
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 not connect, I see that the DS14 supports max of 2gbps, however the adapter is listed as a 10gbps one, any ideas how to configure it to a lower speed?
I tried setting it via ethtool
sudo ethtool -s [device_ ...
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 through/dev/ttyACM0
arp -a
...
(10.0.0.100) at d8:80:39:27:d5:4b [ether] on eth1
...
On the other system (B), the device is visible, yet its MAC address is hidden and it is not possible to establish a connec ...