Recall earlier routing discussion

Starting at A, given IP datagram addressed to B:

• look up net. address of B, find B on same net. as A

• link layer send datagram to B inside link-layer frame

B’s MAC

addr

A’s MAC

addr

A’s IP

addr

B’s IP

addr

IP payload

datagram

frame

frame source,

dest address

datagram source,

dest address

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