ipresend(1) - NetBSD Manual Pages

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IPRESEND(1)                                           IPRESEND(1)



NAME

       ipresend - resend IP packets out to network


SYNOPSIS

       ipsend  [ -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 pack-
              ets.  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 correc-
              tion 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



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IPRESEND(1)                                           IPRESEND(1)


              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.  ether-
              net) 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

       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

















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