Updated: 2022/Sep/29

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IPRESEND(1)                 General Commands Manual                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
       number 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
              packets.  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).
              Packets are read from this file and used as input from any
              interface.  This is perhaps the most useful input type,
              currently.

       -T     The input file is to be text output from tcpdump.  The text
              formats 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
       snoop(1m), tcpdump(8), etherfind(8c), ipftest(1), ipresend(1),
       iptest(1), bpf(4), dlpi(7p)

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)