Adress Resolution Protocol

[bossuyt_2]

I use arp -a on each station to see the cache
What's the data link protocol ?
Is there necessary an arp server and arp clients to use this ?
I want to delete the arp cache ( arp -d IPadress ) but it's dynamic.

Thank's for idea ?

[U.SivaKumar_2 · Accepted solution]

Hi,
ARP is indispensable component of the IP
netowrks. you cannot delete arp cache. since
the operating system will again update it's
arp cache from arp replies. ARP is required
for all network communications.
ref:
The address resolution protocol is a protocol used by the Internet Protocol (IP) network layer protocol to map IP network addresses to the hardware addresses used by a data link protocol. The protocol operates below the network layer as a part of the OSI link layer, and is used when IP is used over Ethernet.

The term address resolution refers to the process of finding an address of a computer in a network. The address is "resolved" using a protocol in which a piece of information is sent by a client process executing on the local computer to a server process executing on a remote computer. The information received by the server allows the server to uniquely identify the network system for which the address was required and therefore to provide the required address. The address resolution procedure is completed when the client receives a response from the server containing the required address.

An Ethernet network uses two hardware addresses which identify the source and destination of each frame sent by the Ethernet. The destination address (all 1's) may also identify a broadcast packet (to be sent to all connected computers). The hardware address is also known as the Medium Access Control (MAC) address, in reference to the standards which define Ethernet. Each computer network interface card is allocated a globally unique 6 byte address when the factory manufactures the card (stored in a PROM). This is the normal source address used by an interface. A computer sends all packets which it creates with its own hardware source address, and receives all packets which match its hardware address or the broadcast address. When configured to use multicast, a selection of multicast hardware addresses may also be received.

The Ethernet address is a link layer address and is dependent on the interface card which is used. IP operates at the network layer and is not concerned with the network addresses of individual nodes which are to be used. A protocol known as the address resolution protocol (arp) is therefore used to translate between the two types of address. The arp client and server processes operate on all computers using IP over Ethernet. The processes are normally implemented as part of the software driver which drives the network interface card.

regards,
U.SivaKumar