It realizes that the destination IP address is outside the subnet in which it is residing. Now, Node A needs to fill in the destination MAC address in dst field of the L2 headers. Then, the packet building proceeds to the data link layer (L2). Let’s say, it found the hostname-IP mapping in its own cache (after all it is a frequently accessed website 😉 ) and hence didn’t perform a DNS request. While building the IP layer (元) of the packet it needs to fill in the IP address in the dst field of the 元 headers. To make an HTTP request to, Node A begins by building the packet. In addition to the IP address, Node A also obtained the gateway IP address (say, 172.17.0.1) and the DNS IP address (say, 172.17.0.100) during the DHCP offer. Node A has an IP address 172.17.0.2, which it received from the DHCP pool when it first entered the network. The goal of this protocol is to exchange the MAC address of the next-hop node when the requesting node knows the IP address of the next-hop node.Ĭonsider a LAN network having subnet ID 172.17.0.0/24, where a node, Node A, is trying to navigate to the website. This protocol works between Layer 2 and Layer 3 of the OSI model. What is ARP?ĪRP stands for Address resolution protocol. A malicious user performs this attack on LAN to establish itself as a man in the middle, or sometimes act as the destination node itself. ARP spoofing or ARP cache poisoning is a network exploitation technique in which a malicious node in a local area network claims itself to be one of the other nodes in the network.

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