raw-ethernet

I'm current working on a program that scans my network and discoveres computers and devices on the network. I use various operations to find data on the devices I discover, but want to distinguish the network devices from computers. And I'm wondering if anyone knows how I could do this? I looked a bit at SNMP, and tried connecting to my network printer, router and modem. But I seem to only be able to connect to the printer, neither the router or modem responds. Is there another way to identify what kind of a device an IP address belongs to? Using a command line tool such as nmap you can finger

Question: I'm testing a section of cable-fault finding software, and I'd like to reliably and reproducibly generate cable faults on a cat5 cable. At the moment I'm using a meter length of untwisted cable, and wriggle the cable manually next to a power supply, but I cannot detect any faults in the application (I'm reading the Ethernet fault counters off the Ethernet ASIC.) Whether this is because no faults are generated, or because the software/hardware detection is faulty, I cannot tell. Is there a way to do this in software? I'd settle for writing something in a higher level language, like

Is there a way to send raw packet Ethernet to other host via C#? In Windows 7 if it makes difference. Nick Martyshchenko Based on suggestion by Saint_pl: I found probably better solution - similar to SharpPcap. It's Pcap.Net - .NET wrapper for WinPcap. Now I can modify my packets whatever I want. I have some resources for you that maybe helpful. I don't try that solutions in Windows 7 but maybe it contains some good info to start. Raw Ethernet Packet Manipulation or mirror on CodeProject This purpose of this article is to explain how to send a raw Ethernet packet using C# on a Microsoft