Questions tagged [ethernet]
For questions relating to Ethernet networking, as defined by the IEEE 802.3 standards.
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Connect Computer to printer using ethernet cable [closed]
I have a scenario where I have connected computer using (RJ45 connector cross over combination) at one end and I have a receipt printer which uses RJ11 6 pin connector. Which combination should I use ...
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Problem with ethernet connection through wall socket - ( Router -> Switch -> Laptops) [closed]
I am new to this forum and I hope that I will get the help that I need.
I am setting up my home network which looks like this:
So I want to connect a router through a switch to all the wall ethernet ...
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Ethernet frame IG/LG bit explanation - Wireshark
I have a screenshot of an ethernet packet frame from Wireshark.
I need to explain what is the meaning of these marked lines (with dots and zeros).
I searched in web, but still I don't have an answer.
...
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What are different encoding schemes used in gigabit ethernet?
I was reading about digital transmission, there are many steps namely:
Analog to Digital conversion
Source coding
Channel coding
Line coding
Pulse shaping
Modulation
Multiple access techniques
...
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Are integrated networking devices, frequently called routers, of the switch type or of a router / NIC type?
Odom,Wendell-_CCNA_200-301_Official_Cert_Guide,_Volume_1.pdf :
many SOHO Ethernet LANs today combine the router and switch into a single device. Vendors sell consumer-grade
integrated networking ...
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How to connect GNS3 to loopback adapter on Windows 10
I'm trying to have a simple topology by connecting a router (c7200) and the local machine which is windows 10. For this I use GNS3 GUI (not the VM application). I have to do that, due to the limit of ...
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Which Ethernet cable should l use to connect two office buildings?
I am an extreme newbie in real networking. I have developed an application for our internal office management which is to be installed on 4 machines. One of the offices is in another building around ...
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Cannot get my servers on the same broadcast domain as backbone gateway using Aruba switches
My supervisor told me to go to the server room and connect a bunch of servers to the Department network so they are accessible from office PCs. In the server room we have 7 servers, a couple of wall ...
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rj45 ethernet coupler
I have an outdoor rj45 ethernet coupler where 1 side of it has a flat ethernet cable plugged in. When I test the whole connection with ethernet cable tester the 2nd light is always off where the other ...
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Yealink & Aruba 1930 Switch Connection Issues
Good day,
I have connectivity issues on my network.
I recently installed new Aruba Instant On 1930 switches with POE and SFP+.
After the new install I started having connectivity issues to my Yealink ...
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Connecting L3 and L2 switches with VLAN settings
I have 1 L3 switch with
Static ip - 192.168.0.252
Two L2 switches
Switch A - 192.168.0.250
Switch B - 192.168.0.251
I have created VLANs in L3 switches with 192.168.1.1 and 192.168.2.2 ips abd set it ...
CommunityBot
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2
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statistics on usage of jumbo Ethernet frames and size of jumbo frames
I am currently researching jumbo ethernet frames.
There are a lot of articles, etc. out there that explain what jumboframes are and how to enable them, but there seem to be no statistics on how ...
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What exactly is fragment free switching?
Most commonly refered to as a compromise between store-and-forward and cut-through switching, this method involves storing the first 64 bytes of the ethernet frame in a buffer and then forwarding it. ...
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1
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Confusion between MDI and MII
Media Dependent Interface
Media Independent Interface
My understanding is 2. is an interface between PHY chip and MAC block on the board. PHY chip can be on the board, or detachable. It is rather PHY ...
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Wifi solution to connect two warehouses on to same network
I’ve just acquired a second warehouse however it’s approx 100m from my current one.
To save me the headache of having two wifi systems what’s the best solution to bring my current wifi network into my ...
CommunityBot
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How does a switch learn a switch table?
Say the switch table is empty. If computer A sends a frame destined to computer B, the switch will broadcast asking who has the MAC address of B. What if C suddenly sends a frame to A? What is the ...
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Is there an equivalent of the Cisco/ Cisco esque command "ip helper-address a.b.c.d" on Mellanox switches?
Apologies for my newbie question. I have recently had a Mellanox switch added to the mix. I was using an "IP helper-address" to forward DHCP requests in different VLANs to my DHCP server(s) ...
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What is the practical use of bandwidth-delay product? [duplicate]
It's given that the bandwidth-delay product defines the number of bits that can fill the link; while the sender can send (1+(2 * Propagation Time / Transmission Time)) units before getting ...
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How to connect HP 2930-8g to the cisco CBS350-8g switch unmanaged?
I want to Connect HP 2920-8g to CISCO CBS350-8g. I tried HP sfp ( J4859D ) in HP and CISCO working fine,
with HP and Cisco switch and cico sfp (MGBLX1) and programmed
switch(config)# allow-...
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Cat5 Ethernet cable between buildings passes connectivity test but switch light not lighting up and no connectivity
I have a 2 buildings about 25 metres apart and there is a cat5 ethernet cable encased in a pipe between the 2 buildings. Just suddenly the connection stopped working. If I test the cable with a ...
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Just testing a 2 pair twisted internet cable having 4 wires [duplicate]
I am having a problem with my 2-pair ethernet cable. I have connected the 4th, 5th, 7th, and 8th pins, but the 4th pin is not working. I have checked the RJ45 connector and the cable with a multimeter,...
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How does data flow in a twisted-pair cable?
If I use an Ethernet cable (twisted pair cable) in what form is the data flowing - digital or analog signal?
And in pair 1, that is wire number 1 and 2, there is Transmit+ and Transmit- respectively. ...
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OVS pop_mpls action returning invalid ethernet frames
I am currently running into walls when trying to pop an mpls label with ovs.
I currently have two interfaces on one ovs instance connected to ports eth0 and eth1. I define a flow on eth0 to pop an ...
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3
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What transmission service gurantees does Ethernet give?
Higher layer transmission protocols have certain properties. For example, TCP "guarantees" duplicate-free, error-free in-order delivery of packets. UDP does basically provide the same properties as IP,...
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Is MII PHY RX_DV required to stay HIGH for entire Ethernet frame?
Regarding MII spec, I have a question about the RX_DV signal that I'm not able to find elsewhere: From the perspective of the Ethernet MAC, when sending a frame to a PHY over MII, does the RX_DV (Data ...
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Calculate Ethernet frame [duplicate]
I have a couple of confusing problems on my course, so I decided to ask here.
The question is:
What is the minimum size of Ethernet frame for a network speed of 100MBps* and maximal segment of 100 ...
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Negotiate at 10 Gbit/s but gain lower speeds due to issues?
During the autonegotiation process, network devices communicate and determine the highest mutually supported data rate. In the case of a network adapter supporting both 10 Gigabit per second (10Gb/s) ...
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Does Ethernet still use CSMA/CD?
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 ...
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Ethernet frame's source mac-address out of a port in an ARP request forwarded to an interconnected switch towards an end host
PC1 ----- (P1) SWITCH1 (P2) ----- (P2) SWITCH2 (P1) ----- PC2
Assume two network switches SWITCH1 and SWITCH2 are interconnected to each other through their ports P2 respectively present on each ...
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What is the difference between PTP 1588 and 802.1 AS?
What are the use cases where one is preferred over other ?
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same rack connection: better RJ45 or SFP?
For a connection between two devices on the same rack:
Is there any notable difference or advantage between using 1Gb SFPs and using Gb Ethernet ports? (making a bonding/etherchannel).
I know for ...
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Is there a way to find all MAC addresses in an Ethernet network?
How can I find all MAC addresses connected to a LAN network? Is there a way or protocol to do this?
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IP and Ethernet endianness
I'm completely new to the topic, I've read that Ethernet sends Bytes in a Big-Endian way, but that bits are sent with Little-Endian. I've also read that IPv4 uses Big_endian order. So my question is, ...
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What is an acceptable bit error ratio?
I recently got a job in IT infrastructure and terminating Cat5e is something relatively new to me.
What is an acceptable bit error rate for 1 million packets?
Here is a screenshot of a test I ...
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Why does Ethernet use EtherType field to determine what type of packet is in a frame instead of just looking at the packet header?
I'm studying for some networking concepts and have learned that a receiving host looks at an Ethernet frame's header to determine what protocol being used by the packet. It makes me wonder though, ...
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Camera instead of ethernet cables
My electricians messed up and installed some sort of camera (or very old cat3?) cables, instead of the requested ethernet cables (see picture). Now I have two of those, running for about 15 meters ...
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How can 1000BaseT transmit on Rx & receive on Tx pins?
How can 1000-BaseT (Gigabit ethernet twisted copper pairs) technology transmit over the Rx pins & receive over the Tx pins?
It's baseband technology (hence the name), right? Discrete digital ...
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Packet Tracer: Ethernet interface up/down
I found that different interfaces have different behaviour on different device (router, switch) when no cable is attached on Packet Tracer 6.0.1.0011.
Router's serial : down down
Router's ethernet: ...
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Reach IP in a different subnet
I have two Ethernet devices:
One is 10.1.1.10 with a netmask set to 255.0.0.0
The other is 10.255.253.5 with a netmask set to 255.255.255.0
Why can't I reach the second device from the first one (...
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How does each OSI layer get to know the information [duplicate]
This might sound dumb but how do each layer get the information?
To give a context,
Lets say I enter www.google.com, the browser sends a request to the Application layer and then the HTTPs request is ...
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Adapting 10GBaseT and NBaseT with a PoE Injector?
Suppose I have a device that supports 10/100/1000/10GBase-T ("Firewall") and another device that supports 10/100/1000/NBase-T ("Modem").
Now, I could connect these two devices ...
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What are EUI-48 and EUI-64?
What are EUI-48 and EUI-64 addresses formed and used? Give me examples.
What are MA-L, MA-S and MA-M assignments?
I have read https://standards.ieee.org/develop/regauth/tut/eui48.pdf
and
https://...
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Responsibility of the physical sublayers of Ethernet
I'm learning about Ethernet and the sources I've found seem to be controversial regarding the role of the physical sublayers of Ethernet displayed on the following image.
Just to mention an example ...
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Is there a ping equivalent on layer 2?
You can use ping to measure RTT between you and an IP host and thereby confirm connectivity. Is there an equivalent that can be used on L2/Ethernet with MAC addresses?
i.e. l2ping AA:BB:CC:DD:EE:FF
(I ...
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How do routers traverse packets to their destination?
Sorry in advance for such a noob set of questions.
I understand that when set with the task of sending a packet to its destination, a computer first checks that the IP address of the destination is ...
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iSCSI silent data corruption
I came across an interesting table with estimations of silent data corruption rate for different interfaces. SAS shows the best result when the built-in integrity control (DIF) is enabled:
Interface
...
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100Mbps embedded device on a GbE network.. can I use MII?
Newcomer to Networking. I would like to connect an embedded device to an existing Fibre Gigabit LAN. The device would source and sink very little data so I am considering my choices.
A ...
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Slim Ethernet 28AWG Length Limitation question for IDFs
anyone have experience with the slim ethernet cabling? I see a lot of atricles stating they are limited to around 30ft. Does this footage include the in-wall cat6 run from Patch panel to Desk drop? ...
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Maximum packet size Ethernet Frame and IP packet
I am a little bit confused about one fact. According to the specification, the ethernet frame maximum size is 1518 bytes, and the IPv4 packet size Length field in an IPv4 header can be up to 65535 ...
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Network connection into a Faraday cage
I have a situation where I need to put a WiFi-only IoT device inside a radiation-shielded space in which the facility WiFi doesn't work. (Even outside the shielded space the WiFi barely works, due, I ...
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