See wikipedia for details.

Datalink layer

Ethernet Frame
Preamble	Start of Frame delimiter	Destination MAC - 6-byte * Most likely MAC@ of gatway system out of local subnet	Source MAC 6 byte	802.1Q tag	Ethertype or length	IPv4 packet Header TCP Segment Frame UDP packet ICMP packet	Frame Check CRC	Interframe Gap
7 octets	1 octets	6 octets	6 octets	4 octets	2 octets	42-1500 octets 65535 octets - Jumbo frame	4 octets	12 octets

802.11 Frame or Wifi Datagram
Frame Control Protocol Version 2-bit Type : Control, Data, or Management 2-bit Subtype 4-bit ToDS 1-bit FromDS 1-bit More Fragements Retry 1-bit Power Mgmt 1-bit More Data 1-bit Protected Frame 1-bit Order flag 1-bit	Duration/ID Usually MAC# of access point	Destination MAC# of another node on wireless subnet or gateway out	Source MAC# of (this) node transmitting	Receiver mac# of next node Used when propagating across wirelessly linked APs	Sequence Control	Transmitter mac# of node transmitting	IPv4 packet Header TCP Segment Frame UDP packet ICMP packet IPv6 Packet Header Additional Headers TCP frame UDP packet ICMP packet	FCS Frame Check Sequence (CRC)
16-bit	2-byte	6-byte	6-byte	6-byte	2-byte	6-byte	0-2312 byte	4-byte

IP or Network layer.

IPv4 packet

Version

IHL

DSCP

ENC

Total Length

Identification

Flags

Fragment Offset

Time To Live TTL

Protocol

Header Checksum

Source IP @

Destination IP @

Options

TCP Segment Frame UDP packet ICMP packet

Bits 0-3

Bits 4-7

Bits 8-13

Bits 14-15

Bits 16-31

Bits 32-47

Bits 48-50

Bits 51-63

Bits 64-71

Bits 72-79

Bits 80-95

Bits 96-127

Bits 128-159

Bits 160-191

16-1484 Bytes

IPv6 Packet
Version	Traffic Class	Flow Label	Payload Length	Next Header Additional Headers Stored in Payload	Hop Limit	Source IP @	Destination IP @	Additional Headers TCP frame UDP packet ICMP packet
40 Octets								8-1460 bytes or Jumbogram

Transport layer

ICMP packet
Type	Code	Checksum	Rest of Header	IP header and 1st 8-bytes of IP packet that triggered error
8 bit	8 bit	16 bit	32 bit	0-x bytes

TCP Segment Frame
Source Port	Destination Port	Sequence Number	Ack number	Data Offset	Reserved	Frame Flags	Window Size	Checksum	Urgent Pointer	Options	Payload
Bits 0-15	Bits 16-31	Bits 32-63	Bits 64-31	Bits 96-99	Bits 100-102	Bits 103-111	Bits 112-127	Bits 128-143	Bits 144-159	Bits 160-195	16-1468 Bytes

UDP packet
Source Port	Destination Port	Length	Checksum	Data
16 bit	16 bit	16 bit	16 bit	0-65507 bytes