Multiplexing

• IP Header has an 8-bit Protocol field

  • Identifies the contents of the data field
    • 1=ICMP (later), 8=TCP, 17=UDP, etc.

Total Length in bytes (16)

Time to Live (8)

Version

(4)

Hdr Len

(4)

TOS (8)

Indication (16 bits)

Flags (3)

Fragment Offset (13)

Source IP Address

Destination IP Address

Header Checksum (16)

Protocol (8)

…

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