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623 ethernet questions.

I have 2 Ubuntu machines, connected via Ethernet cable, machine A at interface eth0 and machine B at eth6. I have configured IP on both machine. ifconfig -a on machine A (showing for eth0 only): ...

I am currently in an office where my ethernet port has been set up as a static IP. I plugged in a 5 port ethernet switch into this static IP port. If I plugged in two gateways to the switch, such as ...

The purpose of such a variable power over Ethernet supply would be to test network equipment that are receiving power over PoE under condition of conditions of low voltage or current and determining ...

Ethernet padding

2 answers, 1.805 views ethernet wireshark ping icmp
I'm using Wireshark for my project. I sent a ping over to Google.com and Wireshark said that the length was 57 bytes(when I received the reply it was 60 bytes long and it contained 6 bits of padding. ...

I want to create a network in my work 4 floors 50m2*4 workplace. Requirements are simple: Share internet ( < 20mb/s ADSL) while blocking someone from abusing download speed for long period. (...

How to really ethernet works on the physical layer. Can anybody point me to some documents? I need really go to depth. I'm interested in modulator/demodulator, coder/decoder, microcontrollers, ...

I have a desktop computer which is not much famous brand "E-tel iPC" and I installed Windows 2008 R2 Standard Edition on that machine. When I go to the Device Manager I can see Ethernet Controller and ...

All: Have an testbed configuration where we're running 24 servers with Intel XL710DA1 40G NIC into a switch with 40/100G ports. Trying to use DACs to hold the cost down, but parsing the specs for ...

I am working at a customer site where I need access to their ethernet for certain ips. However their ethernet does not allow me to use the internet due to company policies. They have a guest wifi I ...

Typically with personal WiFi, you have your ISP line into the home which connects to a modem, then a router (or hybrid of both). Then the router produces a network. But now let's say you take an ...

Let's say one node detected a collision at t=0, in B Mbps ethernet, how long will that node wait before sensing the channel again?

Got a doubt while studying about LLC layer. From Network layer I came to know that IP fragmentation will be done, For L4 TCP will segment the data. Here, the question is Protocols starting from Layer-...

In a given Ethernet frame containing the HTTP GET message can we tell apart whether the MAC address of the destination is of a router or end host? The link to ethernet-ethereal trace :: https://drive....

I have a query on how to compute round trip delay. I know it is 2 times the propagation time, but let's say I have a packet of 100 bits and a transmission speed of 2 Gbit/sec, how do I compute the ...

A cable plugged into a switch but unconnected on the other end, might lead to any problem in a "noisy" environment (industrial)? It's short, 50 cm, but there are motors, inverters, power supplies ...

I have to set up our network in our new office. I'm no networking expert (developer), but I need some input and advice here for some things I wonder about. I have purchased the following: 2 x Cisco ...

I'm a newbie to networking and I wonder what are the reasons for ADSL to use ATM instead of Ethernet ?

Is there something like "technology independent" PHYs? To add the context as Zac67 correctly mentioned, I was reading clause 73 of 802.3-2015. 73.3 - Functional specifications. Excerpt: "The Auto-...

I have two Wi-Fi modules (Moxa AWK 3131) from MOXA. I am trying to set up these two modules in such a way that they can talk to each other. I have connected them as follows, I have configured the ...

We have some devices connected together through a switch. We need to access them through another network, but because of IP counts limitation we cant get IP from that network. Q: How to access my ...

There's no doubt the vast majority of Ethernet frames are transporting IP packets. I know there are various other protocols that can be transported over Ethernet as well, but those can be transported ...

Don't think it's a duplicate. I've searched really many articles and couldn't find the satisfying answer. I understand : how ARP works MAC address is an unique address for each NIC IP is network ...

How would a network behave if one were to set the source address of an Ethernet frame to the broadcast address FF:FF:FF:FF:FF:FF? Obviously, one would have to manually alter the relevant field in the ...

I understand the number in the naming convention. The number represents how many Megabits per second can the standard support. However, I do not understand the rest of the naming convention. What do "...

I am new to networking, know about Ethernet and that Ethernet cables exist to make a wired networks. I also know about fiber optic cables which have a glass like material inside and transmit light ...

I know about different LAN topologies(like star, bus, ring,...) and that Ethernet is one of the ways to practically implement wired LANs. I wonder what other technologies exist to make LANs? And, is ...

According to IEEE 802.1X-2010 the standard for defining MACSec Key agreement protocol Clause 9.6, that's how the key-server decides to use MACSec or no. Each participant advertises whether it is ...

I am trying to wrap my head around MACSec Key agreement protocol (MKA) and its relation with MACSec and other protocols. So bear with me. To my understanding in order to MACSec to work, all nodes ...

I understand that most ports that support SFP+ transceivers can step down to allow an SFP to be plugged into it, but my question is around the transceivers/optics themselves. Can an SFP+ transceiver ...

I have a 1Mb/s link each user uses 100Kb/s when active. With 10 user active 10% of the time, I can have 10 users in a circuit switched environment. Packet switching with 35 users, probability > 10 ...

Over (Software defined network) what will happen when unknown Ethernet hits the first switch, using 4 OF switch and 8 host.

In normal network with Cisco 3650 (1Gbps) and Linux base servers, the ping time is between 0.150ms to 0.250ms. (I also mean using ping or ICMP is to refer to all protocols) I want to know is there ...

I’m working through questions from computer networking top down approach and was hoping to get some clarity on the end-to-end delay calculation. At this stage we are not considering processing, ...

So basically do the modern routers in the internet still use 1500 as the MTU of Ethernet? or the 1500 Byte was for the old days? What I'm asking here is what is the MTU of Ethernet in modern Networks?...

I have a client who has been experiencing a significant amount of performance issues in regards to their telemarketing floor. On my initial assessment, I found that where the ethernet is punched down, ...

I know that cable connection (DSL) is asymmetric, there is a certain bandwidth on the channel, and for a better user experience, they allocate a bigger portion to the downstream. I suppose Ethernet ...

Is there any specific calculation that that was done to arrive at this number, and what were the factors that were taken into consideration for that calculation.

Recently I purchased CAT6 cable with a length of 150 meter. I bought another CAT6 with a length of 148 meter. I joined both the cables using RJ45 cable coupler. I tested it using LAN TESTER, and ...

So considering that CSMA/CD is for detecting collisions, mostly in a bus scenario with a lot of stations, then is CSMA/CD still used? Because right now most of the connections are point to point (for ...

So first off, do ethernet sends ack frames or not? if it doesn't : then how does a router know whether its neighbors are down or not? if it does : then is it cumulative ack with an ack timer or one ...

Can i change the speed of the uplink ports on fortigate 600D from 10Ge to GE? i have core switch alcatel with GE ports need to be integrated with FW 600D

I am testing the ethernet transmission on my Digilent Nexus4 DDR FPGA. I created a really simple packet with a broadcast destination address and some made up ethernet type. Here is the packet as ...

I have 500 feet of what is described as Cat6 Solid STP Copper Bulk Cable (White) Here are the full specs CAT6 STP 8-Conductor, Bulk, PVC Jacket, (FTP) Shiedled AWG23, Solid-Bare Copper,(UL/ETL) ...

Please consider dot1q frames tagged 100 circulating on a LAN (VLAN 100). To go out onto the Internet, frames have to go through a PPPoE sub-interface which is configured as below: interface ...

In order to Telnet to a switch (Layer 2) we create an SVI, thus a layer 3 point of contact is made. The switch inspects each packet sent from the remote client and responds to it so that it gets ...

On my PC I have an Intel Ethernet Connection I217-LM with e1000e driver. If I receive packets in Wireshark or any libpcap based tool, the received ethernet frames start with Ethernet II frame and end ...

Ethernet defines a 2 byte header for the payload's length in its frame format. This header has an ambiguous meaning: if smaller than or equal to 1500 it represents the payload length. if ...

I saw this questionwhich looks kind of related, but I'm not sure as the answers are too confusing. Basically, I want to SSH into my Raspberry Pi from my laptop. Eventually I want to have the Pi ...

I'm trying to understand how crossover cables work, and am looking at this image: I can understand from the image that the transmission wires are swapping with the receive wires, and I know why that ...

I am in an intercom network with 2 telephones at 2 different places A and B. If I pick up receiver at A and dial a certain number, the phone rings at B and I can speak. I have ethernet based ...

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