ICMP
TCP
UDP
DUMP
Questions
TCP - L4 Headers
Source Port (16 bits)
Dest Port (16 bits)
Sequence Number (32 bits)
Ack Number (32 bits)
Ack (1)
Reset (1)
Syn (1)
Fin (1)
L3 Headers
Version (4 bits)
TTL (8 bits)
Protocol (8 bits)
Source IP (32 bits)
Dest IP (32 bits)
L2 Headers
Dest MAC (48 bits)
Source MAC (48 bits)
Bits
(Show Important Headers)
(Show All Headers)
101010101010101010101010101010101010101010101010
101010101010101010101010101010101010101010101010
0000100000000000
1010
0101
00000000
0000010111011100
1010101010101010
0100000000000000
10101010
10101010
1010101010101010
10101010101010101010101010101010
10101010101010101010101010101010
1010101010101010
1010101010101010
10101010101010101010101010101010
10101010101010101010101010101010
1000
0 0 0 0 0 0 0 1
1
1
1
1
1010101010101010
1010101010101010
1010101010101010
10101010101010101010101010101010101010101010101010101010101
0101010101010101010101010101010101010
- Not Important(But Discussed)
- Not Important(Not Discussed)
- Important(D)
- Important(D)
101010101010101010101010101010101010101010101010
101010101010101010101010101010101010101010101010
1010
10101010
10101010
10101010101010101010101010101010
10101010101010101010101010101010
1010101010101010
1010101010101010
10101010101010101010101010101010
10101010101010101010101010101010
1
1
1
1
Total Header Size
32 Bytes (TCP) + 20 Bytes (IP) + 14 Bytes (MAC) = 66 Bytes or 528 bits
MTU (Maximum Transmission Unit)
1514 Bytes - 14 Bytes (MAC) = 1500 Bytes is the MTU
MSS (Maximum Segment Size)
1500 Bytes - 32 Bytes (TCP) - 20 Bytes (IP) = 1448 Bytes is the MSS
Download the TCP Headers Doc
Download the TCP Wireshark Packet Capture