
IP Header
31 28 27 24 23 16 15 13 12 0
Version Words in Type of Service Total number of bytes
= 4 Header (typically 0) in the IP packet
Identification Number Flags Fragment Offset
(which packet) - DF MF (which fragment)
Time-to-Live Protocol Header checksum
(hops left) 6=TCP, 17=UDP (one’s complement sum)
Source IP Address
Destination IP Address
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Options and padding
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