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)

arriving client DHCP discover src : , 68 dest.: ,67 yiaddr: transaction ID: 654 DHCP offer src: , 67 dest: , 68 yiaddrr: transaction ID: 654 lifetime: 3600 secs DHCP request src: , 68 dest:: , 67 yiaddrr: transaction ID: 655 lifetime: 3600 secs DHCP ACK src: , 67 dest: , 68 yiaddrr: transaction ID: 655 lifetime: 3600 secs The DHCP protocol

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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