MDK-ARM Keil, MDK-ARM Datasheet - Page 67

• Manufacturer Part Number: MDK-ARM
• Description: KIT REALVIEW MCU DEVELOPMENT
• Manufacturer: Keil
• Type: Compiler and IDEr

Specifications of MDK-ARM

• For Use With/related Products: ARM MCUs
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Getting Started: Building Applications with RL-ARM
67
the IP address of the remote station. The broadcast message also contains the
local station’s Ethernet address and its IP address. All the other nodes on the
network will receive the ARP broadcast message and can cache the sending
node’s IP and station address for future use. All of the receiving stations will
examine the destination IP address in the ARP datagram and the station with the
matching IP address will reply back with a second ARP datagram containing its
IP address and Ethernet station address.
This information is cached by the sending node (and possibly all the other nodes
on the network). Now, when a node on the LAN wishes to communicate to the
discovered station, it knows which Ethernet station address to use to route the IP
packet to the correct node. If the destination node is not on the local network, the
IP datagram will be sent to the default network gateway address where it will be
routed through the wide area network.
Subnet Mask
A local area network is a defined subnet of a network. Often it uses a specific IP
address range that is defined for use as a private network (for example
192.168.0.xxx). The subnet mask defines the portion of the address used to
select stations within the local network.
The subnet mask is used to
define the station address range
for the local area network.
The subnet mask defines the
network address bits that form
the identity of the local network.
The remaining IP address bits
can be used to assign the address
of nodes on the local network.
By using the subnet mask to
determine the identity of the
local network, any IP datagrams not destined for the local network are forwarded
through the network gateway and then routed through the wider internet. Within
a LAN, each network station must have the same subnet mask and a unique IP
address. These settings may be configured manually on each station. It is
possible to configure the subnet and IP address automatically using a dedicated
protocol.