#REASON FOR MAC ADDRESS HOW TO#
#REASON FOR MAC ADDRESS SOFTWARE#
#REASON FOR MAC ADDRESS CODE#

I dont understand what to do and how to solve it. To the MAC address in example sketch I added gateway and subnet addresses aswell, but the all IP addresses I tried to choose for Arduino are giving or not giving Ping replies with no difference if Arduino is connected to ethernet or not. What happens = the Arduino Ethernet Shield keeps jolly blinking its LINK, TX and RX LEDs in one rhythm with router`s LEDs, 100M and FULLD are steady on - seems nice, but it has no sense. I just tried to get one of Ethernet Library example sketches working (WebServer), but no success so far (this is the 3rd day Im trying it).

From router one cable is connected to my PC (with a fixed IP address) and other cable is connected to Ethernet Shield. I have a broadband cable connection which goes to my router. I m sorry to say, but I have trouble to set up Arduino Ethernet Shield. One socket number is common for web protocol, another socket number is common for file sharing, and so on.

#REASON FOR MAC ADDRESS SOFTWARE#

This lets computers distinguish between multiple software programs at the same IP address. Lastly, when dealing with TCP/IP, you have a socket number. As with the IP/MAC conversion, this lets the folks switch machines, or even service providers, without becoming unreachable. This happens every time you browse this forum. Currently, no Arduino software can make use of these string names, but your computer can ask an authoritative name server (usually attached to your ISP's network) to convert string names to IP addresses. Hostnames like '' or 'localhost' are just a friendly dictionary lookup. In the Arduino world, you're both hardware and software, and so a sketch must have both.

Also, certain IP addresses are reserved for special rules like broadcasting one message to many clients in a range of addresses. But it can easily be configured to use the same IP address, and all of the routers can (nearly instantly) start sending messages to it. Big win here: if a machine breaks, the new replacement machine might not have the same MAC. The underlying hardware has to convert IP addresses to MAC addresses, but that happens without your programs realizing it. When the software on a computer wants to consider talking to another machine, it can do so according to the IP address of that far machine. Again, IP addresses must be unique on a physical network, or devices will get confused. Administrators rarely fuss with the MAC addresses, but they configure related routers and related clients to have similar IP addresses. What's that difference? Software control. The purpose of an IP address is to let software organize the physical devices into logical networks of devices.

#REASON FOR MAC ADDRESS CODE#

At this scale, though, your sketch is the embedded code that includes the MAC address for the device you're constructing. Real networking devices have embedded code that includes their own MAC address, and some allow the MAC to be changed on command.

That's not strictly true, and all that is important is that it be unique for a given physical network. (It has nothing to do with Macintosh.) Every device has its own MAC address, and the original thought was that every device would be globally unique. The purpose of the MAC address is to distinguish devices on the physical network.

Reason for mac address