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Forum Replies

  1. May you pls explain same scenario adding 2 switches and 2 routers in between.

    Computer A -------Switch1-----ROUTER1------------------ROUTER 2 ---- Switch2 ----- Computer B.

    Much Thanks !!

  2. This is best explained with the following two captures:

    https://networklessons.com/wp-content/uploads/2015/12/wireshark-capture-arp-request.png

    Above you can see the ARP request. The sender (fa:16:3e:38:94:94) creates the ARP request and is looking for 192.168.12.2. It encapsulates this in an Ethernet frame with its own MAC address as the source and destination broadcast.

    Everyone on the subnet will hear this message, the device that has the destination MAC address will reply:

    //cdn-forum.networklessons.com/uploads/default/original/2X/9/9f60d1190267be572f382a

    ... Continue reading in our forum

  3. Hi.

    Router A wants to know MAC address of router B. So, it broadcasts ARP. Only router B replies.
    In this case, target MAC should be FF:FF:FF:FF:FF:FF which is broadcastin ARP request. Why the target MAC is all 0’s in ARP request?

  4. Thanks Lazaros, your explanation has been very useful. Now is more clear for me.

  5. Hi Braulio,

    Every device that has an IP address builds an ARP table. They somehow need to map a L3 IP address to a L2 MAC address.

    A computer (host) will have an ARP table. A switch that you configure with an IP address for remote management also has an ARP table.

    Rene

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