Table of Contents
- 1 What is the target MAC address of an ARP request?
- 2 What’s the difference between target MAC address in the ARP section and destination in the Ethernet header?
- 3 Why does the target MAC address contain all 0s?
- 4 What is the source and destination IP address in ARP?
- 5 How to get the MAC address of the target host?
What is the target MAC address of an ARP request?
When a host sends an ARP request to resolve its own IP address, it is called gratuitous ARP. In the ARP request packet, the source IP address and destination IP address are filled with the same source IP address itself. The destination MAC address is the Ethernet broadcast address (FF:FF:FF:FF:FF:FF).
How does ARP get MAC address?
Using ARP, each local network interface tracks both the IP address and MAC address for each device it has recently communicated with. Most computers let you see this list of addresses that ARP has collected. The MAC address is shown right next to it. In this example, the IP address is 192.168.
What’s the difference between target MAC address in the ARP section and destination in the Ethernet header?
The target mac address in the arp header of the request is a non-useful field. It can be ignored, whatever the value in it does not matter. The destination mac address in the ethernet header is ff:ff:ff:ff:ff:ff, which is used to broadcast the arp request within the local area network (LAN). 10.
Why is Target MAC address all 0’s?
The Target MAC address is all zeros, which means it cannot map to the Target IP address. This is intentional, because the reason for sending the ARP Probe is to prevent an IP conflict.
Why does the target MAC address contain all 0s?
So the sender will not fill in any data as target MAC address, because the sender does simply not yet have that information … So the “all zeros” MAC address is just an “unset MAC address”, which will be filled in by the taget host of this request in the ARP answer.
How does an ARP reply packet get the MAC address?
ARP reply packet is directed to the host, which transmitted the ARP request packet. If a host is not able to get the MAC address of a host, how it knows about its IP address? A host will either use a static file like /etc/hosts or DNS protocol to get the IP address of another host.
What is the source and destination IP address in ARP?
In the ARP request packet, the source IP address and destination IP address are filled with the same source IP address itself. The destination MAC address is the Ethernet broadcast address (FF:FF:FF:FF:FF:FF).
What happens when a host receives an ARP Request packet?
After the IP address is resolved by the ARP module, the packet is sent to the Ethernet driver for transmission. What happens when a host receives an ARP request packet? The ARP request is received and processed by all the hosts in the network, since it is a broadcast packet.
How to get the MAC address of the target host?
If the computer is on the same network your computer checks if its arp table already contains the MAC address of the target host. If the table does not contain the MAC address your computer needs to obtain it. This is done via ARP-requests (who has 192.168.2.2, send MAC address to 192.168.2.2 from your example output).