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Internet Protocol Formats

Internet Protocol Formats. IP (V4) Packet. byte 0 byte1 byte 2 byte 3. Version IHL Serv. Type Total Length. data ... – up to 65 K including heading info. Identifcation flags Fragment Offset.

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Internet Protocol Formats

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  1. Internet Protocol Formats

  2. IP (V4) Packet byte 0 byte1 byte 2 byte 3 Version IHL Serv. Type Total Length data ... – up to 65 K including heading info Identifcation flags Fragment Offset TTL Protocol Header Checksum source address destination address options... Unused Padding

  3. IP (V6) Packet byte 0 byte1 byte 2 byte 3 Version Traffic Class (16)Flow Label (20 bits) data – up to 65K Payload Length Next Hops source address destination address

  4. UDP Header byte 0 byte1 byte 2 byte 3 Source Port Destination Port Length Checksum data.... This sites in the data portion of the IP packet. LIterally, its the next layer.

  5. TCP Header byte 0 byte1 byte 2 byte 3 Source Port Dest. Port Sequence Number Acknowlegement Number U A P R S FWindow Offset Reserved Checksum Urgent Pointer options... Unused Padding Data ....... Like UDP... All this sits inside the data area of an IP packet

  6. ICMP (basic) byte 0 byte1 byte 2 byte 3 Type Code Checksum

  7. ICMP Type 3 – Dest. Unreachable byte 0 byte1 byte 2 byte 3 Type Code Checksum Unused Internet Header + 64 bits of original datagram

  8. ICMP Types 8 (echo) 0 (echo Reply) byte 0 byte1 byte 2 byte 3 Type Code Checksum Identifier Sequence Number Data ....

  9. ICMP Timestamp and Reply (Types 13,14 ) byte 0 byte1 byte 2 byte 3 Type Code Checksum Identifier Sequence Number Original Timestamp Timestamp @dest receipt Timestamp @ dest. reply

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