Manual Page - nemesis-tcp(1)
Manual Reference Pages - NEMESIS-TCP (1)
NAME
nemesis-tcp - TCP Protocol (The Nemesis Project)
CONTENTS
Synopsis
Description
TCP Options
Ip Options
Data Link Options
Diagnostics
Bugs
SYNOPSIS
nemesis-tcp [-vZ?] [-a
ack-number
] [-d
Ethernet-device
] [-D
destination-IP-address
] [-f
TCP-flags
] [-F
fragmentation-options
] [-I
IP-ID
] [-M
destination-MAC-address
] [-o
TCP-options-file
] [-O
IP-options-file
] [-P
payload-file
] [-s
sequence-number
] [-S
source-IP-address
] [-t
IP-TOS
] [-T
IP-TTL
] [-u
urgent-pointer
] [-w
window-size
] [-x
source-port
] [-y
destination-port
]
DESCRIPTION
The Nemesis Project is designed to be a command line-based, portable human IP stack for UNIX-like
and Windows systems. The suite is broken down by protocol, and should allow
for useful scripting of injected packets from simple shell scripts.
nemesis-tcp provides an interface to craft and inject TCP packets allowing the user to
specify any portion of a TCP packet as well as lower-level IP packet
information.
TCP Options
|
-a Acknowledgement-Number
|
Specify the
acknowledgement-number (ACK number) within the TCP header.
|
|
-f TCP flags (-fS/-fA/-fR/-fP/-fF/-fU/-fE/-fC/-f-)
|
Specify the
TCP flags:
-fS (SYN)
-fA (ACK)
-fR (RST)
-fP (PSH)
-fF (FIN)
-fU (URG)
-fE (ECE)
-fC (CWR)
-f- NONE
within the TCP header. Flags can be combined in the form ’-fPA’. If flags
are specified in the form ’-f-’ then the TCP header will be built without
flags.
|
|
-o TCP-options-file
|
This will cause nemesis-dns to use the specified
TCP-options-file as the options when building the TCP header for the injected packet. TCP
options can be up to 40 bytes in length. The TCP options file must be created
manually based upon the desired options. TCP options can also be read from
stdin by specifying ’-o -’ instead of a TCP-options-file.
|
|
-P payload-file
|
This will case nemesis-tcp to use the specified
payload-file as the payload when injecting TCP packets. For packets injected using the
raw interface (where -d is not used), the maximum payload size is
65415 bytes. For packets injected using the link layer interface
(where -d IS used), the maximum payload size is 1380 bytes. Payloads can also
be read from stdin by specifying ’-P -’ instead of a payload file.
Windows systems are limited to a maximum payload size of 1380 bytes for TCP
packets.
|
|
-s sequence-number
|
Specify the
sequence-number within the TCP header.
|
|
-u urgent-pointer-offset
|
Specify the
urgent-pointer-offset within the TCP header.
|
|
-v verbose-mode
|
Display the injected packet in human readable form. Use twice to see a hexdump
of the injected packet with printable ASCII characters on the right. Use three
times for a hexdump without decided ASCII.
|
|
-w window-size
|
Specify the
window-size within the TCP header.
|
|
-x source-port
|
Specify the
source-port packet within the TCP header.
|
|
-y destination port
|
Specify the
destintion-port within the TCP header.
|
|
IP OPTIONS
|
-D destination-IP-address
|
Specify the
destination-IP-address within the IP header.
|
|
-F fragmentation-options (-F[D],[M],[R],[offset])
|
Specify the
fragmentation options:
-FD (don’t fragment)
-FM (more fragments)
-FR (reserved flag)
-F <offset>
within the IP header. IP fragmentation options can be specified individually
or combined into a single argument to the -F command line switch by separating
the options with commas (eg. ’-FD,M’) or spaces (eg. ’-FM 223’). The IP
fragmentation offset is a 13-bit field with valid values from 0 to 8189.
Don’t fragment (DF), more fragments (MF) and the reserved flag (RESERVED or RB)
are 1-bit fields.
NOTE: Under normal conditions, the reserved flag is unset.
|
|
-I IP-ID
|
Specify the
IP-ID within the IP header.
|
|
-O IP-options-file
|
This will cause nemesis-tcp to use the specified
IP-options-file as the options when building the IP header for the injected packet. IP
options can be up to 40 bytes in length. The IP options file must be created
manually based upon the desired options. IP options can also be read from
stdin by specifying ’-O -’ instead of an IP-options-file.
|
|
-S source-IP-address
|
Specify the
source-IP-address within the IP header.
|
|
-t IP-TOS
|
Specify the
IP-type-of-service (TOS) within the IP header. Valid type of service values:
2 (Minimize monetary cost)
4 (Maximize reliability)
8 (Maximize throughput)
24 (Minimize delay)
NOTE: Under normal conditions, only one type of service is set within a
packet. To specify multiple types, specify the sum of the desired values as
the type of service.
|
|
-T IP-TTL
|
Specify the
IP-time-to-live (TTL) within the IP header.
|
|
DATA LINK OPTIONS
|
-d Ethernet-device
|
Specify the name (for UNIX-like systems) or the number (for Windows systems)
of the
Ethernet-device to use (eg. fxp0, eth0, hem0, 1).
|
|
-H source-MAC-address
|
Specify the
source-MAC-address (XX:XX:XX:XX:XX:XX).
|
|
-M destination-MAC-address
|
Specify the
defination-MAC-address (XX:XX:XX:XX:XX:XX).
|
|
-Z list-network-interfaces
|
Lists the available network interfaces by number for use in link-layer
injection.
NOTE: This feature is only relevant to Windows systems.
|
|
DIAGNOSTICS
Nemesis-tcp returns 0 on a successful exit, 1 if it exits on an error.
BUGS
Send concise and clearly written bug reports to jeff@snort.org
AUTHOR
Jeff Nathan <jeff@snorg.org>
Originally developed by Mark Grimes <mark@stateful.net>
SEE ALSO
nemesis-arp(1), nemesis-dns(1), nemesis-ethernet(1), nemesis-icmp(1),
nemesis-igmp(1), nemesis-ip(1), nemesis-ospf(1), nemesis-rip(1),
nemesis-udp(1)
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| NEMESIS-TCP (1) | 16 May 2003 |
Generated by manServer 1.07 from /usr/local/man/man1/nemesis-tcp.1 using man macros.
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