Assume that networks and are connected through a router with interfaces (MAC3) and (MAC4).

If host A sends a packet through its network interface (MAC1) to interface (MAC2), what's the MAC and IP source and destination addresses of the MAC/IP packets in the two networks?

Does the IP/MAC addresses of the initial request correspond to the router or the destination machine?

  • Smells like homework, which is off topic here.
    – Ron Trunk
    May 18 at 19:16

1 Answer 1


MAC addresses are confined to the local network because routers strip the frame off a packet to route the packet to a new network interface. The router then builds a new frame for the protocol on the new interface (remember that not all data-link protocols use MAC addressing).

The IP addresses will remain on the packet from source to destination.

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