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tcp.pro | ||||||
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| tcp | RFC 793 + RFC 1700 (Assigned Numbers) | |||||
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| field -src | |
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sparelist | 7 | |
source port |
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| field -dest | |
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samelist | 7 | |
destination port |
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| field -sequence | |
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integer | |
sequence number (if SYN is present, it is the initial sequence number) | |
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| field -acknowledge | |
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integer | |
acknowledge number | |
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| field -dataoffset | |
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integer | 5 | |
number of DWORD in the header, so offset to the data |
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| field -reserved | |
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integer | 0 | |
reserved for future use. Must be zero |
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| field -flags | |
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flags | 0 | |
flags (fragmentation) |
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| field -window | |
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integer | 0 | |
number of data octets the sender of this segment is willing to accept |
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| field -checksum | |
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checksum | |
the checksum (0 means no checksum generated), for header and data | |
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| field -urgent | |
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integer | |
current value of the urgent pointer as a positive offset from the sequence number in this segment (if URG flag set) | |
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| fieldvariablearray -options | |
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mapper(tcp_option) | |
options | |
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| tcp_option | RFC 793 + RFC 1072,1146,1323,1644,2385 | |||||
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| field -type | |
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sparelist | 0 | |
the option itself |
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| field -data | |
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switch | |
specific data depending on the type | |
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| internal tcp_nodecode | ||||||
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| field -length | |
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integer | 0 | |
length of the option |
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| field -data | |
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blob | |
the option data | |
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| internal tcp_mss | RFC 793 | |||||
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| field -length | |
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integer | 4 | |
length of the option |
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| field -mss | |
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integer | |
maximum segment size | |
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| internal tcp_winscale | RFC 1323 | |||||
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| field -length | |
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integer | 3 | |
length of the option |
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| field -shiftcount | |
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integer | |
number of bits by which the receiver right-shifts the true receive-window value, to scale it into a 16-bit value to be sent in TCP header | |
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| internal tcp_sackoptions | RFC 1072 | |||||
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| field -length | |
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integer | 0 | |
length of the option |
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| fieldarray -data | |
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record | |
first sequence number of this block relative to ACK in TCP + size in octets of this block of contiguous data | |
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| internal tcp_echo | RFC 1072 | |||||
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| field -length | |
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integer | 6 | |
length of the option |
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| field -data | |
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integer | |
user defined echo info | |
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| internal tcp_timestamp | RFC 1323 | |||||
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| field -length | |
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integer | 10 | |
length of the option |
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| field -tsval | |
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integer | |
current value of the timestamp clock of the TCP sending the option | |
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| field -tsecr | |
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integer | |
timestamp value that was sent by the remote TCP in the TSval field | |
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| internal tcp_cc | RFC 1644 | |||||
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| field -length | |
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integer | 3 | |
length of the option |
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| field -seg_cc | |
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integer | |
segment connection count | |
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| internal tcp_posp | RFC 1693 | |||||
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| field -length | |
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integer | 3 | |
length of the option |
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| field -start | |
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integer | |
start flag | |
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| field -end | |
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integer | |
end flag | |
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| field -filler | |
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integer | |
filler | |
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| internal tcp_altchecksum | RFC 1146 | |||||
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| field -length | |
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integer | 3 | |
length of the option |
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| field -method | |
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sparelist | |
checksum method to use | |
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Copyright © 2000 Laurent Riesterer.
Last modified on Aug 8, 2002.