IP Address vs MAC Address. You might find the concept of an IP address and a MAC address to be overlapping. That’s not the case. The IP address, whether in a private network or the internet serves as a virtual location for your computer/device.
So you go to the office only to find that there is no longer any device plugged in to port 1. If you only used the port 1 information, you would not be able to positively identify the infected device because the device is no longer plugged into port 1. The only way to truly identify that the infected device is using the MAC address. The purpose of a MAC address (among other things) is to positively and uniquely identify a device. Dear Leo, this information is really very valuable.
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Anyway, you won't get any useful data unless the user is in the same network segment as your server. As was pointed out in the comments, I mixed up the network layers. MAC address is a property of, not a TCP packet. The conclusion is still correct, however.
I eventually figured out that the arp, being a cache table, flushes itself periodically, which is why this method rarely succeeded. The solution is to ping all subnet, but after each ping perform an arp command to see if the IP matches your MAC address, which ensures you not to loose information because of the cache nature of the arp tables. To make it proper, I implemented this in Java; the isReachable() method is really cleaner and there are no cmd prompts spawning everywhere on my screen. Moreover, the 60k+ range of IPs scanning takes up to 10sec using Java threads. I think it's a more secure way than batch scripting.
) Your local area network (LAN) almost always uses “Ethernet” as the under-lying network technology; Ethernet uses MAC addresses to figure out where packets go, not IP addresses. Ethernet usually stops at your ISP router which is why the MAC addresses also stop there. Think: Internet uses TCP/IP (Network layer 3 & 4) whereas Ethernet uses MAC (Network layer 1 & 2) to send information. See the Wikipedia article on the OSI model for more. Chandra, Say, for instance, you are a network admin, and somewhere in your network, there is an infected device on port 1.
Simply, open spotlight ( cmd + space ), type in “ terminal” and hit enter. Once the terminal has been opened, execute the following command ifconfig grep inet 3.
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I thought the aim of this exercise was to FIND an IP address. Doesn't using PING imply you already know the IP (or hostname) which makes ARP redundant? How do you PING a MAC? Assuming no IP or hostname info, I have used a portscanner (like LanSpy or Zenmap) to get MAC > IP info. Currently my preferred method if the device isn't listed in Spiceworks:-) There was a time when I was a baby admin and I didn't want to raise alarms by installing a scanner that I wrote a batch file (yes, that long ago) that PINGed every IP on a subnet, then immediately ran ARP redirecting output to a text file.