Questions tagged [ethernet]
For questions relating to Ethernet networking, as defined by the IEEE 802.3 standards.
884
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Do unmanaged switches automatically do bonding/multi-link? [closed]
If i have 2 cheap unmanaged non-smart consumer level switches such as "Netgear GS308", do they support having 2 cables between them, and effectivly having 2gbit transfer between them? or ...
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22
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Monitoring system components affected by interference in EMI testing of wired ethernet [closed]
I'm conducting Electromagnetic Interference (EMI) testing on Ethernet setups running Windows and Linux. My primary objective is to identify specific system components affected by interference and ...
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15
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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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1
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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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63
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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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31
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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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1
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2
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97
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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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1
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66
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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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0
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15
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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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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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15
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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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1
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19
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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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1
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71
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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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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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2
answers
45
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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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1
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209
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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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3
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105
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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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1
answer
156
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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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2
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165
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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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69
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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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2
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78
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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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2
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427
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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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1
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83
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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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2
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91
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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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1
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40
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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? ...
2
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1
answer
291
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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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1
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220
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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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3
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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 ...
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Is it possible to establish communication using just an ethernet cable?
I have two linux systems, server and client, whose both ethernet port has VLAN tagging(preconfigured IP address and same subnet), and connected with a common ethernet cable (no router or network ...
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2
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201
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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 ...
- 101
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2
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278
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Degradation of signal quality as a function of cat 6 cable length
I would like to make a run of cat 6 ethernet cable between 2 dwellings, underground. It appears I may need just a little over the maximum length for 1 Gbps (100 meters), maybe 110 meters or so. ...
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9
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Why can I send 127.0.0.1 to 127.0.0.0 on my network?
We have a product that runs over IP. This product comes in two halves that are supposed to be connected directly to each other over Cat 5e. All this works fine.
For reasons that are not important, we ...
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I can no longer access my Dell EMC N1124T-on through its GUI interface
We configured and set up our Dell EMC with a Putty interface first and went through the Set up wizard and gave it a static IP. Then joined it to our network and Deployed it into our IDF. Accessed it ...
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2
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What components of a network switch qualify as ASICs?
While studying for CCNA, I came across the information that in a network device, say a switch, the CPU is responsible for the control and management planes work, while the actual data forwarding is ...
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2
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383
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What is the loopback Ethertype?
IANA's list of IEEE 802 Ethertypes includes an entry for Loopback (0x9000). However, I cannot find any specification detailing exactly how this is implemented. Do frames sent with Ethertype 0x9000 ...
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2
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2
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299
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POE injector to extend the number of devices
I have a networking problem. I have a network that runs of a POE switch that is routed to a relatively deep chain of POE powered switches that also passthrough POE. The problem becomes that the load ...
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188
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Why are the pins in this RJ45 port not all identical?
As shown on the picture below, the pins on these Ethernet ports are not all the same.
It looks like pin 3, 5, 7 and 8 (or 1, 2, 4 and 6?) are elevated in order to make contact, but not the others.
I'm ...
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1
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158
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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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2
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Alternative Solution to Avoid Loop aside STP
SITUATION: I have two switches SW1 and SW2. These two switches are connected with two trunk ports. While SW1 is connected to PC1, SW2 is connected to PC2.
If PC1 sends a broadcast frame to PC2 via ...
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SFP28 port and SFP module (not SFP+)
I'm about to buy a device that has some SFP28 ports. I know that SFP28 is backward compatible with SFP+. But I want to know its backward compatibility with the SFP module.
Can I use an SFP module (...
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715
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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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3
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Could Ethernet collisions be avoided using multiplexing?
I know that multiplexing can be used to combine multiple analog or digital signals over a shared medium. Thinking about it I was wondering why we can't use this technique to avoid collisions in ...
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89
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Will the UDP packets reach its destination?
I am trying to send UDP Packets using Linux Socket.
Working inside a Linux VM.
Server IP = 172.16.x.x
Client IP = 172.21.x.x
Both are connected via a Ethernet switch.
Doing a broadcast on company's ...
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1
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213
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MAC OUI in Bits 3 to 24
One networks basics course the statement was made by lecturer for OUI (Organizational Unique Identifier) to be carried in MAC-address Bits 3 to 24. I wonder where the start bit number 3 from? It is ...
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1
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213
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What is Ethernet MDI in the case of SFP interfaces
I am reading on Ethernet and I understand that for copper ports, the MDI is the physical connections from the PHY to the medium's connector, including the physical port itself, where the cable is ...
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683
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Can a jumbogram (giant data packet) be used at a large scale (in WAN for example)?
There are many scientific paper for Jumbo frame, even more, some real implementations and deployments. But it is not the case for Jumbogram !!
Jumbo frame (geant frame) for Layer 2; Jumbogram (geant ...
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199
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can we use RJ45 with cat7 sftp?
I am currently working on connecting ip cameras together .
I am using cat7 sftp cable .
according to the bellow article :
http://www.differencebetween.net/technology/difference-between-rj45-and-rj48/
...
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527
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Does Ethernet have a header and a trailer?
I have read that Ethernet have a header and a trailer, but in Wireshark I can only see an Ethernet header and no Ethernet trailer.
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Length of Ethernet Preamble on 10Gb network
I know (see https://en.wikipedia.org/wiki/Ethernet_frame) that an Ethernet frame includes a 7 byte preamble of 0x55s and a one byte start frame delimiter (SFD) 0xD5, for a total of 8 bytes before the ...
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