ZyXEL Communications P-202 - Manual (Page 63)

P-202H Plus v2 Support Notes
We list the header of the IP, UDP and TCP in order to make you know more
about the format of the IP packet and IPX packet in Menu 24.1 for easy
configuration of a filter rule.
IP Header
0 15
16 31
4-bit
version
4-bit
length
8-bit type of service
(TOS)
16-bit total length (in bytes)
16-bit identification 3-bit
flag
13-bit fragment offset
8-bit time to live(TTL) 8-bit protocol 16-bit header checksum
32-bit source IP address
32-bit destination IP address
Option (if any)
Data
UDP Header
0 15
16 31
16-bit source port number 16-bit destination port number
16-bit UDP length 16-bit UDP checksum
Data (if any)
TCP Header
0 15
16 31
16-bit source port number 16-bit destination port number
32-bit sequence number
32-bit acknowledgment number
4-bit
header
length Reserved
(6 bits)
U
R
G
A
C
K P
S
H
R
S
T
S
Y
N
F
I
N
16-bit window size
16-bit TCP checksum 16-bit urgent pointer
Option (if any)
All contents copyright © 2006 ZyXEL Communications Corporation.
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