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Questions tagged [ethernet]

Ethernet is a set of networking technologies widely used to interconnect computers.

Ethernet is a set of networking technologies widely used to interconnect computers at the physical (layer 1) and link (layer 2) levels. The capability of Ethernet has matured to the point where it is used for both basic desktop computer networking and for carrier-grade networks where operators must guarantee quality of service.

More information at http://en.wikipedia.org/wiki/Ethernet

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What is the actual use of mac address on internet?

I was learning about spoofing attacks and now confused on IP and MAC addreses. I learned that every packets(TCP, ICMP, etc..) send from a computer have an Ethernet header which contain mac address of source and destination (Hope I'm right). Is mac…
Rahul K
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Is it more effective to obtain real-time sensor information using TCP or UDP

I am working on a project which requires sensor information to be obtained from multiple embedded devices so that it may be used by a master machine. The master currently has classes which contain backing fields for each sensor. Data is continuously…
bubbleking2
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using wireshark to figure out type of VNIC

I've been asked in a assignment to analyze a packet trace and determine what kind of VNIC the user has on his or her machine. I'm finding this to be quite difficult however; I'm not quite sure what to look for. I'd appreciate getting pointed in the…
user1553248
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SMSC911x network interface cards' light never comes back on after cable replugged

I have this strange problem in an embedded system (linux) we build, so I don't have normal GUI trouble-shooting tools on Linux or Windows machines. The problem is the NIC is no longer usable after cable removed. Even if I re-plug the cable, the…
lqu
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Unmarshalling ethernet frames and data alignment

So I'm trying to unmarshall ethernet frames eth and ip headers. I have a program skeleton that reads input data from file and serves me a struct with the frame data. I have googled and read other posts on the topic but i'm getting nowhere. For…
Rob
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Why would an HTTP connection stall after exactly 3 ethernet frames?

I am looking at an application which transmits precisely 4380 bytes over HTTP, including headers, before the connection stalls. 4380 happens to be exactly 3 times the maximum segment size of a 1500-byte Ethernet frame (1500 bytes minus 40 bytes of…
jl6
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suddenly packets are stop coming at Ethernet PHY

I have a situation where packets are not coming at Ethernet PHY. I am using DMA ring buffer, the data are copied from physical wire to ring buffer then I am pushing it to upper layer stack. In the DMA ring buffer there are two counters consumer…
rspr
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arping in c++ on linux

I was wondering if anyone knows of a arping api or wrapper written in c++ not c ? I have looked at the libpcap library but I want a c++ alternative if possible http://www.tcpdump.org/pcap3_man.html Programmatic use of ARP Thanks
gda2004
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Connect embedded system to host via ethernet over a switch

I have a arm platform with gigabit ethernet that I would like to connect to my ubuntu machine to test the ethernet ports. Networking is not my strong suit. I've modified /etc/network/interfaces on the embedded system thusly: # Configure…
reign_man
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Is there any advantage over sending multiple files compared to one file?

Is there any performance gain sending many files versus one file over TCP/IP? (Aside from being able to only resend failed files if the connection goes down)
BanksySan
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Can't get serial output while using Ethernet

I started to experimenting with the Arduino Ethernet shield and got it working with not much effort. However, when I try to debug through the hardware serial port of the board, I get nothing, and though the program still runs, and I know it should…
Alan Cor
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Why is length of Ethernet Type field 2 bytes?

There are few types of Ethernet but then also we have 2 bytes for Ethernet Type in the frame structure. Is this not a wastage of space by under utilization of space? I mean is 1 byte not enough to fit all the possibilities of Ethernet Types or is it…
Vaibhav Agarwal
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Java Ethernet traffic generator - read Ethernet load

I am developing a Java application to read/write PLC values trough Modbus TCP, I am using modbus4j. In the same application I want to generate Ethernet TCP traffic, and read the Ethernet load. Do you know some lava library to do this? Best regards.
ramon74
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VLAN support for ethernet on USB on android

I am planning to develop a Ethernet test tool on android tablet. So I need the following information. Does android has driver to access ethernet on USB port? Does the driver has VLAN support? I know that this is not a programming question. But I…
Surjya Narayana Padhi
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802.1x and Arduino Ethernet

Arduino Ethernet does not seem to work on environments where 802.1x is deployed. When connecting a Windows/Mac laptop to the same port, it is possible to "cancel" or not init a certificate authentication, in which case the enterprise can choose to…
Rafael
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