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Questions tagged [ethernet]

For questions relating to Ethernet networking, as defined by the IEEE 802.3 standards.

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Baffled: No continuity but excellent speed on six new Cat6 runs

For my first post on Stack Exchange I have a situation that seems to be impossible: fast internet on cables that show no continuity. I just installed 16 Cat6 ethernet runs in an office. All of them ...
WolfeWires's user avatar
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1 answer
27 views

Is there a null EtherType for packets that are only going to be handled at Layer 2?

I'm sending data into a VM via a Virtio interface, and for whatever reason I want to do Layer 2 routing with the interfaces in promiscuous mode. I know what to use as the source and destination ...
Ken Y-N's user avatar
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2 answers
56 views

Is it possible that not adhering to a standard color coding in ethernet cables would affect performances?

I have two gigabit devices connected to a gigabit switch using cat 5e ethernet cables, but the wirings on the RJ45 connectors do not respect any of the established color standards, because they were ...
leonixyz's user avatar
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2 answers
35 views

Does Ethernet work at the FLIT level?

Does Ethernet work at the FLIT level? If yes, then how are the frames converted into flit and vice versa? If not, then what's the reason?
Debobroto Das's user avatar
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Gigabit Ethernet downgrading to Fast Ethernet - can it tolerate loss of any individual wire? [duplicate]

I have read that a damaged cable that used to work at 1000 Mbps can still be used at 100 Mbps. Does the specific wire inside matter? Say, wire 1 being damaged versus wire 5 or 8? Will two auto-...
Christopher Hostage's user avatar
1 vote
1 answer
90 views

Why does 1000BASE-T require a crossover function?

IEEE 802.3-2018 §40.8.2 Crossover function reads: Although the automatic MDI/MDI-X configuration (see 40.4.4) is not required for successful operation of 1000BASE-T, a crossover function must be ...
claymation's user avatar
1 vote
0 answers
64 views

Setting the EVPN VXLAN Interconnect ESI for Data Center Interconnect (Seamless EVPN VXLAN Stitching)

With reference to Juniper Networks , when implementing data center interconnect (DCI) using seamless EVPN VXLAN stitching , why do we have to define iESI (interconnect ESI) to stitch VXLAN VNI from ...
Nabeel's user avatar
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Are the IEEE 802.3 Clause 40 1000BASE-T MDI-X signal names wrong?

IEEE 802.3 Clause 40 specifies the 1000BASE-T MDI and MDI-X connector pin-outs as: Below, in §40.8.2, it says For a PHY that does not implement the crossover function, the MDI labels in the middle ...
claymation's user avatar
1 vote
2 answers
142 views

Is there any protocol between MAC layer and PHY layer?

If I read the IEEE 802.3 spec. correctly, there has no protocol between the MAC layer and PHY layer. There's only a few signals such as signaling whether PHY is ready for transmission and whether MAC ...
Fox's user avatar
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Fast port connection and ability to daisy chain unmanaged switches on Cisco Catalyst [duplicate]

I have a Cisco Catalyst 2960-S that I use in a home environment. In the configuration I currently have (very basic, basically just switchport mode trunk on upstream and switchport mode access on reset ...
drcomputer's user avatar
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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 ...
bizzehdee's user avatar
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1 vote
1 answer
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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 ...
John Smith's user avatar
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1 answer
132 views

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 ...
SUNITA GUPTA's user avatar
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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 ...
Rob's user avatar
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3 answers
537 views

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 ...
Sakkie's user avatar
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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 ...
Amjal's user avatar
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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 ...
SUNITA GUPTA's user avatar
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1 answer
51 views

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 ...
Angus Comber's user avatar
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0 answers
21 views

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,...
Zohaib Khan's user avatar
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1 answer
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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 ...
Friwi's user avatar
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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) ...
Riccardo's user avatar
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1 answer
81 views

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 ...
Dylan Prost's user avatar
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2 answers
76 views

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-...
Instrumentation Systems's user avatar
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1 answer
496 views

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 ...
bezdoman's user avatar
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3 answers
148 views

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 ...
lyskiddie's user avatar
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1 answer
312 views

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, ...
mizius's user avatar
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2 answers
342 views

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?
BHP's user avatar
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1 answer
84 views

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 ...
dpnv's user avatar
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2 answers
85 views

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 (...
Manitoba's user avatar
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2 votes
2 answers
503 views

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 ...
SEJPM's user avatar
  • 123
0 votes
1 answer
100 views

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 ...
Vitaly Isaev's user avatar
0 votes
2 answers
118 views

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 ...
BlueTwin's user avatar
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1 answer
44 views

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? ...
CableMeThisBatman's user avatar
2 votes
1 answer
559 views

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 ...
Taro's user avatar
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0 votes
1 answer
387 views

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 ...
Chris Moller's user avatar
3 votes
3 answers
135 views

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 ...
Lewis's user avatar
  • 31
0 votes
1 answer
266 views

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 ...
manasvb's user avatar
0 votes
2 answers
312 views

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 ...
Arahasya's user avatar
  • 101
0 votes
2 answers
475 views

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. ...
KevinHJ's user avatar
  • 103
7 votes
9 answers
4k views

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 ...
David Anderson's user avatar
0 votes
0 answers
92 views

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 ...
Ltjbuk09's user avatar
1 vote
2 answers
472 views

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 ...
Marcus's user avatar
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1 vote
2 answers
596 views

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 ...
Ben Zelnick's user avatar
2 votes
2 answers
356 views

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 ...
John Smith's user avatar
0 votes
0 answers
267 views

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 ...
Wurlitzer's user avatar
  • 101
0 votes
1 answer
187 views

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 ...
R Kay's user avatar
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1 vote
2 answers
71 views

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 ...
Adekunle's user avatar
0 votes
1 answer
415 views

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 (...
A.A's user avatar
  • 551
0 votes
1 answer
931 views

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 ...
manula's user avatar
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4 votes
3 answers
149 views

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 ...
ela's user avatar
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