Network Layer

The Network Layer contains the ICMP, ARP and IP protocols. These protocols are included in your project.

IP Internet Protocol Internet Protocol is a best effort transmission mechanism for the TCP/IP protocols. We have implemented IP version 4, the most widely used version on the Internet. IP is the host-to-host protocol responsible for delivering data packets from one physical device to another.

ICMP Internet Control Message Protocol ICMP is a companion protocol to IP. It adds host and management queries and error reporting. ICMP is a mechanism used by hosts and gateways to send notification of datagram problems back to the sender. ICMP sends query and error reporting messages. ICMP acts like a ping server that listens on port 7 for ICMP request packets sent from a client computer, typically a ping client application.The ICMP reply indicates that the eZ80F91 microcontroller is reachable.

ARP Address Resolution Protocol ARP provides a way to lookup a physical ethernet address from the logical IP address. The eZ80F91 Microcontroller is identified on the network by its physical address. ARP is used to find the physical address of the eZ80F91 node when its logical Internet address (IP Address) is known. The Internet address is specified in a configuration file.