IPRESEND(1)                                                        IPRESEND(1)



NAME
       ipresend - resend IP packets out to network

SYNOPSIS
       ipresend  [  -EHPRSTX ] [ -d <device> ] [ -g <gateway> ] [ -m <MTU> ] [
       -r <filename> ]

DESCRIPTION
       ipresend was designed to allow packets to  be  resent,  once  captured,
       back out onto the network for use in testing.  ipresend supports a num-
       ber of different file formats as input, including  saved  snoop/tcpdump
       binary data.

OPTIONS
       -d <interface>
              Set  the interface name to be the name supplied.  This is useful
              with the -P, -S, -T and -E options, where it  is  not  otherwise
              possible  to associate a packet with an interface.  Normal "text
              packets" can override this setting.

       -g <gateway>
              Specify the hostname of the gateway through which to route pack-
              ets.   This  is  required  whenever  the  destination host isn't
              directly attached to the same network as  the  host  from  which
              you're sending.

       -m <MTU>
              Specify  the  MTU  to  be  used  when sending out packets.  This
              option allows you to set a fake MTU, allowing the simulation  of
              network interfaces with small MTU's without setting them so.

       -r <filename>
              Specify  the  filename  from  which  to  take input.  Default is
              stdin.

       -E     The input file is to be text output from  etherfind.   The  text
              formats  which  are  currently  supported are those which result
              from the following etherfind option combinations:

                 etherfind -n
                 etherfind -n -t


       -H     The input file is to be  hex  digits,  representing  the  binary
              makeup  of  the  packet.   No  length  correction is made, if an
              incorrect length is put in the IP header.

       -P     The input file specified by -i is a binary file  produced  using
              libpcap  (i.e.,  tcpdump version 3).  Packets are read from this
              file as being input (for rule purposes).

       -R     When sending packets out, send them out "raw" (the way they came
              in).  The only real significance here is that it will expect the
              link layer (i.e.  ethernet) headers to be prepended  to  the  IP
              packet being output.

       -S     The input file is to be in "snoop" format (see RFC 1761).  Pack-
              ets are read from this file and used as input  from  any  inter-
              face.  This is perhaps the most useful input type, currently.

       -T     The input file is to be text output from tcpdump.  The text for-
              mats which are currently supported are those which  result  from
              the following tcpdump option combinations:

                 tcpdump -n
                 tcpdump -nq
                 tcpdump -nqt
                 tcpdump -nqtt
                 tcpdump -nqte


       -X     The input file is composed of text descriptions of IP packets.

SEE ALSO
       ipftest(1), ipsend(1), iptest(1), bpf(4), ipsend(5), tcpdump(8)

DIAGNOSTICS
       Needs to be run as root.

BUGS
       Not  all of the input formats are sufficiently capable of introducing a
       wide enough variety of packets for them to be all  useful  in  testing.
       If you find any, please send email to me at darrenr@pobox.com




                                                                   IPRESEND(1)
