- Continue with design of THE Internet Protocol (IP). - Unique identifiers hardcoded in the hardware. - Puts destination’s and its own MAC address in the header. - Must use MAC address as part of the address. - Assign each end-host an addresses of the form — Switch:MAC. - Puts destination’s and its own Switch:MAC address in the header. - Switches forward the packet using first part of the address. - Destination is able to recognize the packet is for them using second part of the address. - Routing tables cannot have entry for each switch in the Internet. - Use addresses of the form — Network:Host. - Routers know how to reach all networks in the world. - Routing algorithms only announce “Network” part of the addresses. - Routing tables now store a next-hop for each “network”. - Routers ignore host part of the address. - Packet forwarded using Host part of the address. - What do I mean by “network”. - In the original IP addressing scheme. - Wide Area Network (WAN) delivers to the right “network”. - Addressing in the US mail. - Cornell a.c.0.0/16 a.c. - Cornell a.c.0.0/16 a. - AT&T a.0.0.0/8. - Cornell a.c.0.0/16. - “My traffic can’t be carried over my competitor’s network!”. - “d: path (B,A)” “d: path (A)”. - Look for its own node identifier in the path. - node 1 sees itself in the path 3, 2, 1. - “d: path (2,1)” “d: path (1)”
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