However from Host A's perspective it means the overall latency is lower because it can forward frames immediately before the next hop MAC address is resolved.I'm seeing an issue with a computer (running an embedded OS) transmitting over a network to an XP embedded machine. Neither of these approaches are ideal from an overall network performance perspective (routers do not process frames with a broadcast MAC address efficiently) and all hosts must process boradcast traffic. If the host is not on the segment but a router is on the segment, because it hasa brodcast MAC address it is processed by the router and forwarded to the destination. If Host B is on the same segment it will process it as though it had the correct MAC address. What should happen is that host A should wait for an ARP responce however, instead of waiting for a response, it may sent the packet using the broadcast MAC address. This means that an IP packet with a broadcast or multicast MAC address will be accepted by the stack. Upper layer software, such as the IP stack, typically does not examine the MAC address on the basis that if the frames passed thru the NIC is must be for this host. A NIC card will typically accept frames that match its MAC address, the broadcast address and often multicast addresses. NIC cards typically work on MAC addresses. If not then it knows that it must forward to packet to its router and as a result will ARP for the routers MAC address. If it is, then it will issue an ARP directly for host B. When a local host (IP address A) wants to send to a remote host (IP address B) it first looks to see if IP address B is on the same IP subnet as itself. Use to establish the connection with the remote node or the router to Which will include the MAC address of the destination that you must To respond to the query will send a response directed to your device The device that has that IP address, or it's also valid for other devices Network the ARP module will send an ARP query using the IP address of Will send a broadcast ethernet message (ARP query) asking the MACĪddress for the destination IP address, if the destination is not on your local If you have your stack properly configured (including your netmask) if theĭestination IP address belong to the same IP subnetwork the ARP module The IP protocol over ethernet to obtain the MAC address of the destination, To encapsulate an IP datagram into an ethernet frame you need the sourceĪnd destination MAC address, to obtain the MAC address of your destinationĪRP stands for Address Resolution Protocol and is the mechanism used in Because you are using 'Ethernet' as the transport medium.

Wireshark mac address to ip address