I Pv4 2004

Protocolo IP Profa. Ana Cristina Benso da Silva Disciplina: Redes de Computadores

Roteiro ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Características do IP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Características do IP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Frame IP Version HLEN Service Type Total Length Identification Flags Fragment Offset Time to Live (TTL) Protocol Header Checksum Source IP Address Destination IP Address IP Options (if any) Padding 0 4 8 16 19 24 31 Data

Campos IP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Campos do IP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Campos IP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Campos do IP ,[object Object],[object Object],[object Object],[object Object]

Service Type ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Precedence D T R Unused 0 3 4 5 6

Service Type ,[object Object],[object Object],[object Object],[object Object],CODEPOINT Unused 0 6

Service Type – compatibilidade ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

IP Options ,[object Object],[object Object],[object Object],[object Object],0 1 3 COPY OPTION CLASS OPTION NUMBER

IP Options ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

IP Options ,[object Object],[object Object],Option Number Descrição 1 No operation 2 Security 3 Loose Route 7 Recorde Route 8 Stream Identifier 9 Strict Source Route 11 MTU Probe 12 MTU Reply 4 Timestamp 18 Traceroute

Record Route Option ,[object Object],[object Object],copy + option class + option number = CODE (1 byte) CODE LENGTH POINTER FIRST IP ADDRESS SECOND IP ADDRESS ... 0 8 16 24 31

Code e Pointer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Source Route Option ,[object Object],[object Object],[object Object],copy + option class + option number = CODE (1 byte) CODE LENGTH POINTER IP ADDRESS OF FIRST HOPE IP ADDRESS OF SECOND HOPE ... 0 8 16 24 31

Timestamp Option ,[object Object],[object Object],[object Object],CODE LENGTH POINTER OFLOW FLAGS FIRST IP ADDRESS FIRST TIMESTAMP ... 0 8 16 24 31 copy + option class + option number = CODE (1 byte)

Timestamp Option ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Timestamp - Flags ,[object Object],Valor das Flags Descrição 0 Registre apenas o timestamp, omita o endereço IP 1 Acrescente o endereço IP e após o timestamp 3 Endereços IP são especificados pela origem. O roteador só irá registrar seu timestamp se o próximo IP na lista for o seu.

Fragmentação ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Fragmentação ,[object Object],Header IP Dados Header IP Dados Frag #1 Header IP Dados Frag #1

Fragmentação ,[object Object],[object Object],Header IP Dados Header IP Dados Frag #1 Header IP Dados Frag #2 ID = xxxx DF = 0 MF = 1 OFSSET = 0 ID = xxxx DF = 0 MF = 0 OFSSET = 0+Tam FRAG #1 Original Fragmentos

Fragmentação - exemplo R1 R2 MTU = 1500 bytes MTU = 1000 bytes MTU = 1500 bytes 1 Datagrama Origem 3000 bytes 3 fragmentos de 1000 bytes 3 fragmentos de 1000 bytes ID = 12345, DF = 0 MF = 0 Offset = 0, len = 3000 ID = 12345, DF = 0 MF = 1 Offset = 0, len = 1000 ID = 12345, DF = 0 MF = 1 Offset = 1000, len = 1000 ID = 12345, DF = 0 MF = 0 Offset = 2000, len = 1000 ID = 12345, DF = 0 MF = 1 Offset = 0, len = 1000 ID = 12345, DF = 0 MF = 1 Offset = 1000, len = 1000 ID = 12345, DF = 0 MF = 0 Offset = 2000, len = 1000

Fragmentação com DF = 1 R1 MTU = 1500 bytes MTU = 1000 bytes 1 Datagrama Origem 3000 bytes 0 fragmentos Retorno ICMP ID = 12345, DF = 1 MF = 0 Offset = 0, len = 3000 ID = 12345, DF = 1 MF = 0 Offset = 0, len = 3000 Datagrama Descartado !!! ICMP – Destination Unreachable Fragmentation Neede and DF = 1 ICMP – Destination Unreachable Fragmentation Neede and DF = 1 Recebido pela origem do datagrama Se Offse t == 0 icmp

Remontagem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Fragmentação & Remontagem Origem N. 7 N. 4 N. 3 N. 2 N. 1 Destino N. 7 N. 4 N. 3 N. 2 N. 1

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