Network Layer by peterl. forwarding table routing protocols path selection RIP, OSPF, BGP IP protocol addressing conventions datagram format packet handling.

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Presentation transcript:

Network Layer by peterl

forwarding table routing protocols path selection RIP, OSPF, BGP IP protocol addressing conventions datagram format packet handling conventions ICMP protocol error reporting router “signaling” transport layer: TCP, UDP link layer physical layer network layer

ver length 32 bits data (variable length, typically a TCP or UDP segment) 16-bit identifier header checksum time to live 32 bit source IP address head. len type of service flgs fragment offset upper layer 32 bit destination IP address options (if any)

S: , 3345 D: , NAT translation table WAN side addr LAN side addr , , 3345 …… S: , 80 D: , S: , 5001 D: , 80 2 S: , 80 D: ,

data destination address (128 bits) source address (128 bits) payload len next hdr hop limit flow label pri ver 32 bits

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