Provided by: irpas_0.10-4.1_amd64 bug


       igrp - igrp route injector


       igrp  -i  <interface>  -v  -f <routes file> -a <as number> -S <spoofed source ip addrs> -D
       <destination router ip addrs>


       This manual page documents briefly the igrp command.  This manual page was written for the
       Debian distribution because the original program does not have a manual page.

       IGRP  is  a tool for route injection. The routing protocol IGRP is no longer really widely
       used in the outside world, but for the first steps, we  decided  to  use  this  one  as  a
       starting point.

       The  whole  purpose  is  to  define  a  routing table with all possible parameters by hand
       without having your system actually running any kind of dynamic routing and  sending  this
       information  out  to  the  routers.  Since IGRP is a broadcast based protocol, the default
       behavior is to send these messages to the ip broadcast address (  If  you
       want  to  inject  a  route  to  a system remote from you, you have to address the 'update'
       accordingly and make sure that you send the packet(s) with the right  source  address,  so
       the router accepts the update.

       Before  using  the  tool,  you have to design your routing table you want to inject in the
       target router. It should contain data which makes your route  the  prefered  one  for  the
       victim. The format is:


       where  destination  is  the network (, delay is in ms/10, bandwith in MBit per
       second, MTU is the maximum transfer unit (1500 for ethernet), reliability and load are  in
       percent (255=100%, 1=0%) and hopcount just in hops.

       Empty lines and lines beginning with # are ignored.

       -i <interface> interface

       -v verbose

       -f <routes file> file, which contains the routes  (as much as you like)

       -a  <autonomous  system> autonomous system the IGRP process is running on, use ASS to find
       it out or specify a range to use with -a START -b STOP to send  updates  to  all  AS  from
       START to STOP (I highly recommend using ASS for this!!)

       -S <spoofed source IP> maybe you need this

       -D <destination IP> If you don't specify this, the broadcast address is used

       If  you want the routes to be persistent (after some testing around), make up a shell loop
       and run the program within this loop every 25-30 seconds, to keep the router beliving your


       This manual page was written by Vince Mulhollon <>, for the Debian GNU/Linux
       system (but may be used by others).

                                         January 1, 2003                                  IGRP(1)