Questions tagged [ethernet]

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

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Is it possible to split 4 network card ports into 4 different adapters?

I have a network card which contains 4 Ethernet ports but there is only one network adapter being shown in the adapter settings, I'm looking for a way to somehow split each Ethernet port into it's own ...
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How did 10gbe happen without increasing the number of wires in the cable? [closed]

The ethernet cable speed jump from 100Mb/s to 1Gb/s was possible because all of the wires were put to use in a patch cable. The jump from 1Gb/s to 10Gb/s required no such increase. How did they do ...
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Using VLANs to pass two separate LANs over a single ethernet run (with a twist)- best practice?

I am using two small managed switches each side of single ethernet run linking two rooms, to 'trunk' two VLANS, enabling two separate LANs to pass over it. The source of the each LAN being it's ...
user1246690's user avatar
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What kind of (modular) patch panel do these conectors fit into?

We recently moved into a new office, inheriting all cabling installed by the previous tenants. Right now there is a bundle of 30 network cables which look like they belong into a patch panel. I found ...
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Is it possible to create a second network device with a specific name?

Due to a licence server requirement I need to have an eth0 or eth1 named network device. However, my current configuration only has a network device named enp8s0. I am using a CentOS 7 linux system. ...
Woltan's user avatar
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Configuring Dual Interfaces for for two external IPs on Ubuntu

I am trying to connect a second ISP connection to my server for our SIP Phones. eth0 has our default 25Mb service on 192.168.1.x, I've configured eth1 for the new 6Mb service to be 10.10.1.x Both ...
Toaster's user avatar
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How to know if 2 ethernet ports of the same modem are separated?

I have a Digi TransPort WR family of 3G/4G cellular routers with 2 ethernet ports, digi told me that the ethernet ports are separated but i want to know if they are not in the same network it's a ...
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Any ideas on how to emulate eight network adapters using a single physical adapter?

I have an interesting setup that is moving from a legacy design to a newer design. The legacy design had eight physical, fiber optic media network adapters. The newer design utilizes a 10gb, copper ...
Michael's user avatar
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Is it possible to override the destination MAC of multicast frame via a static ARP entry?

I have what I believe is a somewhat obscure question. I have a very specific use case here, so please consider this question purely academic. I have a device (running Linux 2.4 kernel) which ...
Corvette1250's user avatar
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Slow Mac Download Compared to Windows on Mac on Network

We have Mac (there is no difference what the OS version, is, it gives the same results) end users who are experiencing slow Mac download on the LAN. When a download is started, the download time for ...
TeNaJ Systems's user avatar
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Bridge 802.1x traffic between eth0<->eth1, IP NAT eth0<->eth2

Summary: Given a Linux system (Ubuntu 16.04) with 3 physical ethernet interfaces: eth0: WAN eth1: EAPoL authenticator eth2: Client LAN I am attempting to configure this: Bridge br0: eth0<->eth1 ...
RandomUser's user avatar
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Add eth2, eth3 etc. instead of eth1:0, eth1:1 etc

I'm trying to create virtuel ethernet networks on my Debian machine. I've got 4 static IPs assigned to the machine, and would like them to be virtuel present at eth2, eth3 etc. instead of eth1:0, eth1:...
Michael Nielsen's user avatar
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Is exist methods for tune GETNEXT for many many many of sequential OIDs?

I am coding in C some tool for monitoring ethernet switch by snmp v1 and Net-SNMP lib. In one of the step I get FDB table from switch. It gets by request getnext with OID .1.3.6.1.2.1.17.7.1.2.2.1. ...
Black S.'s user avatar
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Connect two TTYs via TCP/IP

I have two computers running Debian and connected via Ethernet. They see each other. I need to connect two virtual terminals on this computer this way: anything I input in first terminal will be ...
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22k views

How to find unix eth port link speed

I have small issue with my openwrt router. I want to know link-speed in format 10M,100M, 1000M, etc. or 10BaseT .. but I can't find it in /proc or with "ip" command also "dmesg" doesn't provide ...
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Why do some VLAN Wireshark captures include data after the IPv4 payload?

Data Some Cloudshark captures show a "Trailer" for the vLAN and some do not. Captures With extra 4 bytes. Without extra 4 bytes. Question Why do some and not all VLAN Wireshark captures include ...
Klik's user avatar
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Fibre Channel Adapter as a NIC?

Is it possible to use a Fibre Channel PCIe adapter as an Ethernet network interface? I have QLogic Fibre Channel controller and a 3Com Gigabit Ethernet switch. I use Debian on a DL160 G5.
Alberto Perro's user avatar
2 votes
1 answer
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Debugging dropped UDP messages on Linux

Here's my setup: I have 1 host that has a 1 Gbit Ethernet connection and 2 hosts with 100 mbit connections (connected to the 1Gbit host through different switches). In a test, I send 1000 1kb ...
gnr's user avatar
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What's the Wireshark packet receiving and processing procedure on a Windows machine?

I am about to use Wireshark for some traffic monitoring on my Windows computer. While working on it, I was wondering how Wireshark manages to catch low level network packets before Windows does. ...
Hansi's user avatar
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ethernet cable configuration with possibility to connect one computer at the end or at the middle of the cable [closed]

I would like to know if this Ethernet configuration would work. ethernet configuration Of course, only one device could be connected to either socket 1 or socket 2. The cables between router and ...
arckin's user avatar
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Dropped packets in all Linux and Unix

I have a problem. I have a motherboard by Supermicro – X11SBA-LN4F. There are 4 ethernet ports. In the first port I connect to the internet. In the second port I connect to my local network. When, I ...
Valeriu's user avatar
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GRE protocol type for Ethernet over GRE?

For a IP over GRE tunnel, as defined by the RFC 2784, the "protocol" field is filled with 0x0800 (defined as ETH_P_IP in the Linux kernel according to this source http://www.scs.stanford.edu/histar/...
dreadiscool's user avatar
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Ethernet cord not detecting in centos 7

Please help me out, the ethernet modules all are loaded but i could not find remaining the two ethernet ... [root@vpn ~]# lspci | grep -i ethernet 01:01.0 Ethernet controller: VIA Technologies, Inc. ...
Murugan Chandrasekar's user avatar
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Unable to Ping over wifi [duplicate]

We have 2 PCs and 4 laptops in the office, and we use D-Link 2750U to connect to internet. All the computers can connect to the internet successfully. One thing that I noticed recently, is that PCs (...
Omid1989's user avatar
1 vote
1 answer
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Debugging why network packets are being dropped

Preface: I have an application that I am currently testing out that runs on RHEL 6. The setup for my test is the application installed on a embedded device, connected by an Ethernet cable to PC that ...
jgr208's user avatar
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Measuring 40Gbe performance

I've connected two hosts via a 40Gbe fibre link and would like to determine a baseline for data transfer between them. I'm seeing relatively low speeds (~620MB/s). It seems that the signalling rate is ...
0_0's user avatar
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Need a program to check all Ethernet ports in my office for it's proper functioning [closed]

my office has a 20 Mbps leased line connection and we are using a firewall machine and unmanageable switches. Now the problem is the we are getting a very slow speed on all the nodes and we are unable ...
Shyam Sunder Raj's user avatar
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100BASE-FX WDM vs 100BASE-BX vs 100BASE-BX10 - Are they all the same?

Are these three all the same thing being inconsistently named by different manufacturers? 100BASE-FX WDM uses separate wavelengths (1310 nm & 1550 nm) for Tx & Rx over a single strand of ...
Monstieur's user avatar
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Lan card not recognizing connected cable

I have a system with Ubuntu Server 14.04 installed on it. The onboard ethernet port is faulty. As I want to setup DHCP server on it, I have installed two external LAN cards. I also have a leased line. ...
Saurabh Sharma's user avatar
1 vote
3 answers
2k views

Network adapter only works with ethernet switch

I have a Dell XPS13(Win 10 Pro) and since we dont have wireless lan in the office i had to buy an external ethernet adapter (DA200). The adapter works perfectly fine at home but it doesnt work at all ...
factor77's user avatar
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802.1Q and Network Security

I've recently purchased some TP-Link managed switches (two TL-SG1016DE and one TL-SG105E). I purchased the two first and set it up using 802.1Q VLANs to segregate my DMZ and my LAN, using tagged/...
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Using LINK_REQUIRED parameter with wicked

I'm running SLES 12 and trying to configure network interfaces; this is my first experience with wicked. I'm using "ifup" to up the ethernet devices. I ran into an issue of not being able to ifup the ...
jetson23's user avatar
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2 answers
1k views

Windows Limiting Internet Speed [closed]

I am currently experiencing a strange problem on my Windows Server 2012 R2. My whole network has been done with CAT6 UTP and everything (switches, adapter, etc) is able to do gigabit. My Internet ...
David Bélanger's user avatar
-3 votes
1 answer
12k views

Difference between 1.0 Gbps & Auto Negotiation [closed]

I am downloading a huge file and was wondering on how to boost my Ethernet speed. I found this option called "Speed & Duplex" And there were a few options. Two of them were 1) 1.0 Gbps Full ...
Guy named Jon's user avatar
2 votes
1 answer
2k views

Does a private MAC Address range exist?

I need a set of MAC/Ethernet addresses that I do not have to worry about collisions with, analogous to 192.168.x.x: addresses that will NEVER be assigned to real hardware.
Mark Gerolimatos's user avatar
1 vote
0 answers
60 views

Multiple IPv6 addresses added to interface, now IPv6 not working on my server [duplicate]

I got /64 IPv6 block from my server provider. When I add few IPv6 addresses (maybe 10 or 20) to network interface. Everything works fine about IPv6 network. When I'm added above 500+ IPv6 addresses ...
Temüjin's user avatar
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1 answer
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Assign more than one IP Address to the same MAC Address on Linux ISC-DHCP Server

I have the following question: One Linux DHCP server in pool mode, because of the step of fabrication, all the products have the same MAC Address that is changed at end of line, the boards use ...
Juliano Oliveira's user avatar
1 vote
1 answer
449 views

Infiniband switch, uplink

Regarding switches like Mellanox Voltaire VLT-30011 (QDR IB, managed). I see a gigabit ethernet port on the switch which in the manual (http://www.mellanox.com/related-docs/prod_ib_switch_systems/...
Jay's user avatar
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-1 votes
1 answer
696 views

Can we use a ADSL2+ modem in bridged mode to convert to ethernet WAN? [closed]

I am no networking master, so I have no clue if this makes sense. I have a DSL line from my internet provider with all the service details. Now, I have a TP-Link modem (+router) WD8961N. This is ...
weirdpanda's user avatar
2 votes
1 answer
309 views

route table issue when I appended option net.ifnames=0 to grub2

I appended two options net.ifnames=0 biosdevname=0 to grub2 because I want to change default network name to old name eth0 on RHEL 7. After that, I edited /etc/sysconfig/network to set default ...
Hai Nguyen's user avatar
1 vote
0 answers
1k views

10gb ethernet direct connection (no switch)

Im trying to connect 2 computers with 2 PCIe "Core 4 HP 671798-001 HP CX-2 NIC 1 PORT 10GB" I'm using a SFP+ Direct Attach Copper Cable (I think they are also called twinax) I found a similar ...
Gustav Garrison's user avatar
4 votes
1 answer
3k views

How to dynamically find the name and type of interfaces attached to a system

I have a use case where I need to dynamically configure some files which includes the name of the interfaces present in system say eth0 , wlan0 . However when I change the system sometimes its changed ...
Ankit Kulkarni's user avatar
0 votes
1 answer
127 views

how to disable ethernet interface eth5 permanently and how my added routes in rc.local file is unset when i reboot machine

actually my machine having 3 interface cards eth0 eth4 eth5 where eth0--local ip and eth4--wan Ip1 and eth5--wan ip5 but i want to disable permanent eth5 and i have added some routes in rc,local file ...
pawan1491's user avatar
0 votes
2 answers
7k views

How to install USB-to-Ethernet Adapter on Windows Server 2012 [closed]

I am having problems installing a USB-to-Ethernet (model HB-T66) on my HP ProLiant ML310e Gen8 v2 server (Intel Xeon) running Windows Server 2012 R2 Standard. In Device Manager, the device appears at ...
Jonas's user avatar
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1 vote
2 answers
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Is it possible having two Ethernet connections simultaneously on the same UTP Cat6 cable? [closed]

Actually it is a two part question. 1.Since an ethernet connection only requires 2 pairs (green and orange), is it feasible to wire blue and brown pairs to a different Lan port of a router and ...
Aris Kon.'s user avatar
2 votes
0 answers
334 views

Sudden failure of networking interface on CentOS 7

We're running a LAMP stack VPS on CentOS 7 hosting a few websites, MariaDB databases, and associated services. In the middle of the night our server mysteriously went completely offline. When we ...
MarathonStudios's user avatar
0 votes
1 answer
2k views

Router - huge difference in Tx vs. Rx

I have two computers: (B) Banana Pi - 1 Gigabit Ethernet, Wi-Fi (supports 802.11n) (D) Desktop PC - 1 Gigabit Ethernet, Wi-Fi (2x2 MIMO, supports 802.11n) And (R) Mikrotik RouterBOARD RB951G-2HnD - ...
Peta Sittek's user avatar
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2 votes
1 answer
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Is PoE 802.3af Compatible with 802.3at?

If I connect a device that is compliant with POE 802.3af (surveillance camera) to a device (switch) which is POE 802.3at. It will work?
user11490's user avatar
1 vote
0 answers
170 views

Weird network interrupt issue

in ifconfig output i am seeing Interrupt 16 but when i check in /proc/irq/ i am not seeing number 16 there. following number i am seeing here. my driver is broadcom tg3 [root@centos7 ~]# ls /proc/...
Satish's user avatar
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2 votes
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802.1q VLAN echo replies do not include VLAN ID

I am running a SLES11, SP4 kernel on 2 systems. I have 2 NICs connected through a Netgear GS724T switch. I have configured VLAN 400 on the switch. On system 1, I create a VLAN 400 on eth0 called ...
jetson23's user avatar

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