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How does ARP and ICMP work?
When you attempt to ping an IP address, an ARP request is sent at the same time. Your firewall may be blocking the ICMP echo, but chances are the computer will receive an ARP reply. Your computer’s ARP table will contain the IP address and MAC address of the host you are trying to reach.
Is ARP an ICMP protocol?
ICMP ARP Proxy-ARP DHCP Page 3 ICMP ICMP uses IP as if ICMP were a higher level protocol (that is, ICMP messages are encapsulated in IP datagrams). However, ICMP is an integral part of IP and must be implemented by every IP module.
What information does ARP provide?
The Address Resolution Protocol (ARP) is a communication protocol used for discovering the link layer address, such as a MAC address, associated with a given internet layer address, typically an IPv4 address. This mapping is a critical function in the Internet protocol suite.
Which is layer does ARP and ICMP use?
ARP runs on top of layer 2 protocol, i.e. using services provided by data-link protocols. ICMP runs on top of layer 3 protocol. For example, ICMP uses IP protocol to delivery ICMP datagram to remote host in remote, non-local network. ARP uses Ethernet protocol to flood out question “Who is x.x.x.x?’ over switched network.
How is the ARP used in a network?
ARP (Address Resolution Protocol) is a network protocol used to find out the hardware (MAC) address of a device from an IP address. It is used when a device wants to communicate with some other device on a local network (for example on an Ethernet network that requires physical addresses to be known before sending packets).
What does ICMP stand for in network protocol?
The ICMP stands for Internet Control Message Protocol. It is a network layer protocol. It is used for error handling in the network layer, and it is primarily used on network devices such as routers.
Can you send an ARP request instead of an ICMP echo?
If you are not on the same subnet as the host you are trying to connect to, then this method is not going to work without first joining that subnet, which may or may not be physically possible. Thus by sending an ARP request rather than an ICMP echo, you are virtually guaranteed to get a reply.