710 Practical Hacking Techniques and Countermeasures
Chapter Tool Syntax
Chapter 6
(continued)
Packit a ack number The acknowledgment (ACK) number
defines the next sequence number that the sender of
the ACK expects to see. It is typically the sequence
number + 1 during valid TCP communication. It is a 32-
bit unsigned (positive) number.
-W window size The window size provides flow control.
It is a 16-bit number that defines how many bytes the
receiver is willing to accept. The default value is 1500.
-u urgent pointer In valid TCP communication, the urgent
pointer is only useful if the URG flag is set. Used with
the sequence number, it points to the last byte of
urgent data.
This section documents the UDP header command-line
options. UDP is the default IP protocol for TRACE mode.
-S src port The port from which our source address is
communicating. This value is random by default.
-D dst port The port on the destination we would like to
communicate on. In inject mode this value is 0 by
default while in trace mode this value is random by
default. You may also specify a range of addresses in
the format: -D 1:1024.
This section documents the ICMP header command-line
options:
-K type Specify the ICMP type. See docs/ICMP.txt for
details on types.
-C code Specify the ICMP code. See docs/ICMP.txt for
details on codes.
Echo Request/Echo Reply options:
-N id number Define the 16-bit ICMP identification
number.
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