Multiplexing.

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Presentation transcript:

Multiplexing

Multiplexing IP packets can carry different things in their data fields TCP segments UDP datagrams ICMP supervisory messages (later) RIP messages (later) IP Data Field IP Header

Stream of Arriving or Outgoing IP Packets Multiplexing We say that IP can multiplex (mix) different types of traffic in a stream of IP packets Single IP Packet Carrying UDP Datagram UDP IP-H TCP IP-H UDP IP-H ICMP IP-H Stream of Arriving or Outgoing IP Packets

Multiplexing IP process must pass contents of arriving IP packets to the correct process for subsequent handling TCP UDP UDP IP-H IP ICMP Arriving Packets IP Process

Multiplexing IP process must also accept messages from multiple processes and multiplex them on an outgoing stream TCP UDP IP-H UDP IP ICMP Outgoing Packets IP Process

Multiplexing Need a Way for Receiving IP Process to Know What is in the Data Field So it can pass the contents to the appropriate process IP Data Field IP Header

Multiplexing IP Header has an 8-bit Protocol field Identifies the contents of the data field 1=ICMP (later), 8=TCP, 17=UDP, etc. Version (4) Hdr Len (4) TOS (8) Total Length in bytes (16) Indication (16 bits) Flags (3) Fragment Offset (13) Time to Live (8) Protocol (8) Header Checksum (16) Source IP Address Destination IP Address …

Multiplexing Other Messages have Analogous Fields TCP and UDP Identify contents of data field TCP and UDP Have Port number fields Identify the application process (80=HTTP) Source Port # (16) Destination Port # (16) Sequence Number (32 bits) Acknowledgement Number (32 bits) Hdr Len (4) Reserved (6) Flags (6) Window Size (16)

Multiplexing Other Messages have Analogous Fields PPP Identify contents of data field PPP Protocol field identifies contents of information field as IP, IPX, a supervisory message, etc. Flag Addr Ctrl Prot Info CRC Flag