Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help 
NAME
     nemesis-tcp -- TCP Protocol (The Nemesis Project)

SYNOPSIS
     nemesis-tcp [-vZ?] [-a NUM] [-c COUNT] [-d IFNAME] [-D ADDR] [-f -AR -FLAG]
		 [-F OPT] [-I ID] [-i INTERVAL] [-M MAC] [-o FILE] [-O FILE]
		 [-P FILE] [-s NUM] [-S ADDR] [-t TOS] [-T TTL] [-u OFFSET]
		 [-w SIZE] [-x PORT] [-y PORT]

DESCRIPTION
     nemesis 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.

GENERAL OPTIONS
     -c COUNT
	     Number of packets to send, default: 1.

     -i INTERVAL
	     Seconds  between  repeatedly  sent packets, only available if -c is
	     given.

     -v      Display the injected packet in human readable form.  Use  twice  to
	     see  a  hexdump of the injected packet with printable ASCII charac-
	     ters on the right.  Use three times for a hexdump	without  decoded
	     ASCII.

TCP Options
     -a NUM  Specify  the  acknowledgement  number  (ACK  number) within the TCP
	     header.

     -F FLAG
	     Specify the TCP flags within the TCP header.  The	following  flags
	     are supported:

		   -fS	SYN
		   -fA	ACK
		   -fR	RST
		   -fP	PSH
		   -fF	FIN
		   -fU	URG
		   -fE	ECE
		   -fC	CWR
		   -f-	NONE

	     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 FILE
	     This will cause nemesis-tcp 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  op-
	     tions file must be created manually based upon the desired options.
	     TCP  options  can	also  be read from stdin by specifying `-o-' in-
	     stead.

     -P FILE
	     This will cause 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  inter-
	     face  (where  -d  IS used), the maximum payload size is 1380 bytes.
	     Payloads can also be read from stdin by specifying `-P-' instead.

	     Windows systems are limited to a maximum payload size of 1380 bytes
	     for TCP packets.

     -s NUM  Specify the sequence number within the TCP header.

     -u OFFSET
	     Specify the urgent pointer offset within the TCP header.

     -w SIZE
	     Specify the window size within the TCP header.

     -x PORT
	     Specify the source port within the TCP header.

     -y PORT
	     Specify the destintion port within the TCP header.

IP OPTIONS
     -D ADDR
	     Specify the destination IP address within the IP header.

     -F OPT  Specify the fragmentation options in the IP header:

		   -FD	      don't fragment
		   -FM	      more fragments
		   -FR	      reserved flag
		   -F offset

	     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 ID   Specify the IP ID within the IP header.

     -O 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 op-
	     tions can also be read from stdin by specifying -O- instead.

     -S ADDR
	     Specify the source IP address within the IP header.

     -t 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 TTL  Specify the IP time-to-live (TTL) in the IP header.

DATA LINK OPTIONS
     -d IFNAME
	     Specify the name (for UNIX-like systems) or the number (for Windows
	     systems) of the IFNAME to use (eg. fxp0, eth0, hme0, 1).

     -H MAC  Specify the source MAC address, (XX:XX:XX:XX:XX:XX).

     -M MAC  Specify the destination MAC address, (XX:XX:XX:XX:XX:XX).

     -Z      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.

SEE ALSO
     nemesis-arp(1), nemesis-dhcp(1), nemesis-dns(1), nemesis-ethernet(1), neme-
     sis-icmp(1),   nemesis-igmp(1),  nemesis-ip(1),  nemesis-ospf(1),	nemesis-
     rip(1), nemesis-udp(1).

AUTHORS
     Mark Grimes <mark@stateful.net> and
     Jeff Nathan <jeff@snort.org>

BUGS
     Please report at https://github.com/libnet/nemesis/issues

				  Dec 16, 2019			  nemesis-tcp(1)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=nemesis-tcp&sektion=1&manpath=FreeBSD+Ports+15.1.quarterly>

home | help