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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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network cable crimping - only 10MBit

I am doing home network installation, and tried to connect a router and a PC with a cable that is placed within the walls of the house. I had to do crimping on both ends with a RJ45-Jack. However, ...
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15 views

network issue when pinging hosts of the same lan [migrated]

I have two hosts on the same network: Kali which is on VirtualBox as guest; eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 ether 08:00:27:48:45:25 txqueuelen 1000 (Ethernet) ...
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1answer
60 views

Can only access the gateway at the end of my ssh ethernet tunnel why?

I have a remote private network connected to the internet via a Linux gateway. The gateway has the following arrangement: eth0 - external IP br0 - with eth1, and tap0 devices added to the bridge. ...
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0answers
19 views

bonding configuration when SLAVE=yes

In my network configuration I see the settings of SLAVE=yes what is mean that - SLAVE=yes # cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 BOOTPROTO=none ONBOOT=yes # Settings for ...
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1answer
20 views

2 physical interfaces change the link to a different interface name, on reboot

Environment: I have two physical network interfaces on my system: Qualcomm Atheros Ethernet Realtek Ethernet (RTL-8169) On the system, i have Ubuntu-18.04. Problem: I have configured: Realtek ...
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1answer
21 views

How do I run internet to my hardwired ethernet lines without putting the wireless router in a bad location?

I have a situation where a building was pre-wired for Ethernet (Cat-6, I believe). After some research, I believe if I wanted to run internet to all the cables that run to the rooms in the building, I ...
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1answer
84 views

How is the Ethernet payload only max 1500, while I can ping with larger size packet?

Just recently I came to know that the payload of Ethernet is max 1500 bytes (mtu). The first thing that came to my mind was that we can ping with much more size than that. So I thought maybe the ...
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23 views

How to advertise an Ethernet port in Uboot?

I am working with a custom board which has a vf6xx processor and a specific marvel switch which has 10 physical ports, of which I am using 5. On linux side, I am able to set speeds, autonegotiation, ...
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1answer
42 views

Configuring Juniper EX2200 Ethernet-Switching

Recently I started configuring an Juniper EX2200 to be used with an fibre optic connection in it's SFP module. The switch itself is online and can ping remote hosts without an issue after setting the ...
1
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1answer
79 views

Static MAC address for cluster nodes on AWS

There are some scientific computations to be run. They use a software module, which license is tied to a MAC address. On AWS I created ENI (Elastic Network Interface). I tie it to EC2 instances of my ...
1
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1answer
86 views

What does rx_csum_offload_errors mean?

I see too many rx_csum_offload_errors on ethtool output and it constantly increases. What is the reason of these errors and how can I fix it? # ethtool -S enp12s0f0 | grep error rx_errors: 0 ...
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30 views

Debian: Detected Hardware Hang ended in unreachable server -> how to identify root cause?

I recently had one of my servers going into halt state where I was not able to reach any of its endpoints nor to login via ssh. The only way was to reboot via hardware power button. After inspecting ...
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2answers
101 views

What happens if a USB Ethernet Adapter has the same MAC address as the PC's network card it is connected to?

What happens if a USB Ethernet Adapter has the same MAC address as the NIC? Is it possible for internet connection to pass through the usb-ethernet adapter succesfully or not, in that scenario?
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2answers
84 views

Connecting two buildings, 250 meters, heavy snow country, high lighting risk

I will have a new fiber optic Internet connection coming in to building A, and need to set up an access point in building B. Both are commercial buildings. The fiber Internet is currently 20 Mbps, ...
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2answers
60 views

Are there any types of switches that allow you to set custom network speed on their ports? [closed]

I know there are managed switches out there that allow you to hardcode the speed of their ports to 10/100/1000 Mb per second. But what if I want to set the speed to only 1 Mb per second or perhaps ...
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2answers
115 views

Created AWS EC2 instance from snapshot AMI, eth0 is missing after startup

I recently created a new EC2 from a snapshot of our Production EC2. The machine started up fine, and I can ssh in, however - cannot access via anything else. No WWW, nothing. Upon further inspection ...
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1answer
101 views

Why Linux continues to use disconnected ethernet interfaces?

I have a Linux system with two ethernet interfaces, eth0 & eth1, which are used on the same subnet. At times, I see that even when one of the interfaces is disconnected (cable unplugged), Linux ...
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1answer
70 views

How to turn an ethernet port into a passive listener?

I want to capture ethernet packets with my raspberry pi's ethernet port. I know I could create an ethernet bridge between two ethernet ports on the raspberry and analyze the packets internally with ...
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0answers
35 views

Weird answer of linux DHCP server to gratitious ARP causes DHCP failure

This is a problem, that I ran into recently on a quite heavily configured linux server. This machine runs Samba as an Active Directory Domain Controller, a mail server, a web server, two virtual ...
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2answers
688 views

Changing network interface speed with ethtool is not working

Im using lenevo M5 server which have Gbps ethernet cards, but strangely when i read cat /sys/class/net/eth3/speed it show 100 similarly when using ethtool it show 100Mbps only.The output of dmesg and ...
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1answer
2k views

How to reserve a static-ip on Mikrotik router for a device that is attached to a fixed router's Ethernet port

I am trying hard to figure out how can I force any DHCP client device connects to the port ETH10 on Mikrotik router get assigned a fixed IP-address. Please note that the device MAC address is unknown ...
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0answers
29 views

Setting up a Proxmox device to allocate IPs to KVMs on isolated networks

I am a novice attempting to dive into low level networking and I'm not having any success. Documentation regarding BGP and level 3 / 2 switch routing is sparse and assumes you know a huge amount. I'...
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2answers
151 views

Can a 24V 1Gbps Ethernet port start operating in 100Mbps mode if it was exposed to 48V PoE?

I have heard that a situation where a 24V Gbit Ethernet port was not completely fried after being exposed to 48V current, but downgraded to fast Ethernet - 100Mbps. Question: I that possible and ...
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1answer
34 views

What network to use for HDMI over Ethernet Extender

I'm interested in "HDMI over Ethernet Extenders" for my firm. Most say in their description that they need a closed-off or separate UPnP-Network. Does that mean I can't use the Extender in my already ...
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0answers
148 views

Serial terminal servers that work with “serial-over-USB”

I've used serial terminal servers for a long time. Basically, these are devices that allow you to communicate with a serial (eg RS232/RS485/RS422) device over ethernet in various ways. Folks in this ...
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0answers
47 views

Very strange network behavior (perfect HTTP at 50% ping losses for specific Ethernet card)

I'm dealing with Ethernet networks since 1989 and I believed I had seen it all when a few days ago I had this really strange experience that first I have to share with someone and second I'd love to ...
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0answers
94 views

ufw conditional interfaces - Dynamic Routing only when an interface has an active connection

I have an interesting setup. Two Wireless Cards and One Ethernet Card all in one box. Sometimes the device is connected to the internet via wired Ethernet interface, and sometimes via Wireless ...
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0answers
20 views

share on wlan printer connected through ethernet cable

I have a network problem. I am not an expert in networking, though I used to work in tech. support for a while and I know basics in networking and windows/linux utilities for it's administration. I ...
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0answers
54 views

Multiple NIC on same subnet with one port disconnected

I have a Linux system with 3 dedicated NICs & all 3 are on the same subnet with the following IPs ETH0: 192.168.1.10 ETH1: 192.168.1.11 ETH2: 192.168.1.12 I've setup three routing tables & ...
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1answer
34 views

Is there still a limit of 100m ethernet cable between two FDX switches?

If the connection is just between two switches, there can be no collisions. So shouldn't the switches be able to cope with much longer delays than the standard 100m?
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2answers
76 views

Ethernet switch changing port

At university we are learning about ethernet switches and I got the following question: What happens with the frames addressed to a machine x, if this machine is disconnected from the switch and ...
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2answers
150 views

What connection does RDP default to when host machine is on wifi and ethernet? [closed]

When the host machine I'm connecting to is currently on both the docked (ethernet) and wireless version of our network, which one does RDP default to when I initiate Remote Assistance?
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44 views

ubuntu-14.04 - why can I only connect only on one ethernet interface

I have multiple interfaces on a server, but I can only connect on one of them, I cannot ping the other one, I don't understand why. IP addresses are given by a dhcp server, the interfaces receive them....
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1answer
565 views

Wireshark under Windows: Any way to capture packets before dropped by special filter drivers?

I've got some GigabitEthernet Vision cameras, which use Ethernet to communicate. The protocol is simple UDP, but for performance reasons (high packet throughput causing CPU load) the manufacturer uses ...
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1answer
436 views

Bonding 4 Gigabit ethernet and 2 Fiber SFP+

We received a DL380 with 4 Gigabit Ethernet (normal CAT6), and 2 Fiber SFP+ (HPE 10Gb SR SPF+). I've successfully managed to bond the 4 Gigabit Ethernet together, and put in place some LACP on our ...
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0answers
223 views

how to name SR-IOV Virtual Functions

When an SR-IOV Virtual Function (VF) is created, the Linux kernel names it ethX, with X being the lowest available index among Ethernet interfaces. Is there a way to control such naming? For ...
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1answer
776 views

Copying Files from Linux Mint 18 to Windows 10 via SAMBA Share Very Slow

I've set up a SAMBA share on a Linux Mint 18 box that I'm using as a file server, and I'm attempting to copy files from the share to a Windows 10 machine. Both machines are connected to ethernet. In ...
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2answers
109 views

Joining vlans by bridges

What anomalies might happen if you try to join a bunch of vlans by bridges in a cluster of Linux servers? We'll presume, you have a group of servers doing running VMs (qemu-kvm), these VMs have their ...
0
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1answer
317 views

Linux routes for point-to-point Ethernet network in presence of a default route

SOLUTION: There's a typo in the IP address on my laptop Ethernet interface (see the accepted answer). The following writeup is most probably proper setup. I'd like to communicate with Raspberry Pi (...
0
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1answer
38 views

Ethernet switch with Infiniband uplink

There are Ethernet switches (copper based, i.e. with RJ45 sockets) that have Fibre uplink. Example: Netgear GS110TP Are there any such switches with Infiniband uplinks? If not then why?
2
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1answer
38 views

Some user can't connect to network

I got into work today and found that 5 out of 35 users were not able to connect to the network. They are all Windows 7 and all are connected to my Windows Server 2008 R2 domain through unmanaged ...
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3answers
181 views

diffrence between csma/cd and tcp/ip

I finished my middle school IT & Networking education about 2 years ago. Now I recently got a job and started to refresh my knowledge. I've been searching the internet first of course but I still ...
0
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1answer
208 views

Powering a Patch Panel [closed]

So I'm in the process of replacing all the telephone wall plates with ethernet plates so I will have the choice to hardwire to the internet from any room if I so desire. right now I have my internet ...
8
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0answers
127 views

Shocking ESD damage, what more can be done? [closed]

Today, over $6,000 in networking equipment was destroyed. Remarkably, the main circuit SPD, power strips and APCs are fine. Ethernet seems to be the method of surge transmission, as everything ...
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1answer
71 views

NIC suddenly doesn't recognize cable

I have a server lab with an ASROCK motherboard. Built this server about 6 months ago. Today, while working on it, the NIC Local Area Connection (Ethernet) suddenly showed that the cable is unplugged....
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1answer
152 views

My computer sometime uses ISL instead 802.1q?

My computer is connected to another computer via Ethernet (via a very simple unmanaged switch). I want to make the traffic between the two computers VLAN tagged with 802.1q protocol. My computer use ...
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2answers
2k views

Do all ethernet switches support multicast, even the cheap ones?

I'm playing with LANs here at home and I want to support multicast. Do all switches nowadays support multicast? Even the cheap ones? I'm buying a 5-port gigabit switch at Amazon for $15. Will it ...
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2answers
61 views

Can I disconnect the upstream port of an ethernet switch to create a local network without Internet? [closed]

I have two computers connected to an ethernet switch. The switch is connected to my ISP router for internet access, through the switch upstream port (of course). What happens if I unplug the upstream ...
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3answers
168 views

Ethernet jamming [closed]

I just had a weird experience on my home network. Our ethernet went down; pinging an adjacent host was impossible. I checked the switch; all lights were on and flickering, although they were ...
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2answers
4k views

What is the minimum gigabit Ethernet latency I can expect? [closed]

I have 2 servers sitting in a rack running Ubuntu 16.04 with a 1 meter Ethernet cable between them, both having standard Intel Ethernet adapters. The ping between the two is about 300 us (...