Questions tagged [ethernet]

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

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Bad performance with Intel E810-C 100 GbE card

I have a test setup with 4 servers, one of them is equipped with an Intel E810-C 100 GbE card. The other three have Mellanox ConnectX-5 100 GbE network cards. All four are connected to an Alcatel 100 ...
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How can I assign human-readable names to MAC/ethernet addresses without knowing the IP address?

I am using tools like airodump-ng and the output lists BSSIDs as MAC addresses. However, some of these stations (and clients) are known to me and I would like to tag them, or name them, something. I ...
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QSFP-DD to QSFP+ Compatibility

I am looking to output multiple data lines from an FPGA at 10 Gbps. Ideally I am trying to use QSFP cages for this. To save money and bandwidth, I saw that there was a device with QSFP-DD cages. My ...
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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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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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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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48 views

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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44 views

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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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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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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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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92 views

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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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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Should SNMP ifHCInUcastPkts counters include packets bigger than 1522 bytes?

Packets bigger than 1522 bytes (as counted by Spirent Test Center) are being forwarded (bridged) but not counted in the following hardware counters on an Open Network Linux device: ifHCInUcastPkts ...
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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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156 views

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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Domain not resolving inside the local network but working externally

I'm using an Ubuntu system that hosts my domain example.com in an apache server. Recently I have changed my router and configured all virtual servers with proper port forwarding. Unfortunately, after ...
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1answer
49 views

Why is my client still talking to my server when I change client IP to different subnet?

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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1answer
46 views

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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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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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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How can I use iptables to drop packages for an invalid ether-type?

19:27:47.782291 98:9b:cb:: > ff:ff:ff:ff:ff:ff, ethertype Unknown (0x88e1), length 60: 0x0000: 0000 a000 b052 38e5 d57f 0000 0000 0000 .....R8......... 0x0010: 0000 0000 0000 ...
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161 views

Setup L2TP Tunnel to transport Ethernet Frames on pfSense and xl2tp

We have two sites connected through an IPSec Tunnel established between a pfSense Firewall on each side. Hosts from both sides can communicate fine through IPSec. We have a new application using ATA ...
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VLAN trunking on Linux Bridge

Local Lab Design This is the network diagram I am trying to implement. I have 3 VLANs whose description is given in the image and I am using Proxmox to create and configure virtual machines. When I ...
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Need feature name: ethernet switch recognizes manual cable disconnect and shuts down the port

Once in a hospital's radiology department, we had this nifty security feature -- I just cannot remember the proper name to succeed at various search engines: If a host's ethernet cable was ...
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101 views

Automatic switching between ethernet and 4G on router? [closed]

I have a router which have both incoming internet through Ethernet and 4G via USB. My fiber connection is unstable, and I have gotten a courtesy 4G SIM from my ISP. Is it possible to set up the router ...
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233 views

How to bond two interfaces having different speeds in Linux?

I have successfully set up two simultaneous VPN tunnels over different Internet connections to the same server. Then I've bonded them using systemd-networkd and balance-tlb mode. It works as designed,...
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1answer
104 views

How to connect computers directly with ethernet?

I try to connect two linux computers via a crossover cable. I need help at troubleshooting. I configured ip-address , and on PC1 ifconfig-command shows enp0s7: flags=4163<UP,BROADCAST,RUNNING,...
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Making an argument for over-provisioning fiber

I work in research university, and we are moving to a new building. I suspect that new building will be equipped with mostly 1GbE copper, 10GbE copper, and possibly 10GbE-compatible fiber. Is it ...
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Reasons for ethernet interface to stop responding for ~30 seconds, then acknowledging all received packages?

First question! Hi! Running on Ubuntu 16.04. Hardware info: lspci | awk '/[Nn]et/ {print $1}' | xargs -i% lspci -ks % 00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (2) I219-V ...
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48 views

Is there a way to alias a specific interface ip?

I've got a VCS running on debian as prod server, and due to some hypervisor issues it had to be rebooted/migrated/updated several times in the past week. Because i'm running my app using docker ...
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1answer
266 views

Ethernet patch or crossover router to router [closed]

I we have run Ethernet in the house, through a fast Ethernet switch, through a wall patch, over the river and through the woods as it were. From router A, through switch, through wall patch, then to ...
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96 views

Ethernet Cable Broken [closed]

Hi I have a 15m ethernet cable going under my floor from the front to back of house. It has developed a fault and pins 1 & 6 are no longer connected (I've tested it). Given getting it back up or ...
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1answer
94 views

A way to configure DMZ zone on Ethernet Mellanox Switch

Can't find any information is it possible at all and how to configure DMZ zone on Mellanox MSN2100 switch. If I setup ACL disabling traffic from DMZ to LAN, I can't receive response to requests made ...
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257 views

How to bridge two VMWare vsphere “VM Network” on two different site?

I got Two site with some ESXi 6.7. Each site has his own IP addressing and I would like to bridge the "VM Network" on the distant site to the local "VM Network" so I could start a VM replicat on the ...
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Debian / Kerio is ARP storming my ISP after loosing connection to the gateway

The problem: after Kerio Control (Debian) lost connection to the gateway it starts sending ARP like for "who has 8.8.8.8?" in such frequency, that the gateway gets shut down due to packet inspection ...
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2answers
180 views

Windows Server 2016 Installation doesn't found Network adpter (Hard Drive Found!)

I have a just bought PowerEdge T640 server and i am trying to install Windows Server 2016 Standard. I have downloaded the Windows Server 2016 ISO and mount a bootable pendrive using Rufus. I boot the ...
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89 views

Ethernet wiring of pairs for a 100mbit configuration

In Ethernet wiring, for a 100mbit configuration, if Pairs C & D are connected at one end instead of pairs A & B, would it function? Computer: Eth A ==| B ==| ...
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What's typical in terms of reliability for fully wired Ethernet LAN for normal, non-outage, non-overload conditions?

Can anyone point me to industry guidance of any kind for expected LAN reliability for normal, non-outage, non-overload conditions? I suspect some device is blocking or throttling my connections. I ...
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183 views

How is 10GBASE-T defined for providing compatibility?

Is there a common source for description (like for "data link layer" and might include electrical specification of "physical layer") of 10GBASE-T as standard for technical devices? Considering ...
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899 views

What transceiver can convert 10GBASE-KR or 10GBASE-KX4 to 10GBASE-T or 1000BASE-KX to 1GBASE-T? [closed]

A pci-e network card supports 1000BASE-KX, 10GBASE-KX4 and 10GBASE-KR on SFP connector, but the required mode for twisted pair support on RJ45 (8P8C connector) is 1G- or 10GBASE-T. What type of ...
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872 views

Host unreachable if eth0 has no IPv4 in ethernet bridge

I am currently attempting to configure an ethernet bridging VPN with the use of OpenVPN. However, whenever I am trying to setup the ethernet bridge, the server (Raspberry Pi) looses connection from ...
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1answer
103 views

how to safely increase a network's MTU

I want to increase the Ethernet Maximum Transmission Unit (MTU) for some hosts on a local network. Is there a known sequence of steps to follow? Or, can I just tweak each host's MTU as needed and it ...
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1answer
349 views

Zabbix eth0 incoming traffic, triggering false alarms?

I'm a bit confused right now, I just got this false alarm I had an item set up to monitor incoming and outgoing traffic on my servers and despite it working as intended for A WHOLE MONTH, suddenly I ...
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1k views

Where to find list of possible arguments for ethtool -K?

When I want to disable/enable interface features with the ethtool -K command, how can I list all available options? When I run ethtool -k I see a list of options, but I don't know the equivalent ...

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