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Archive-name: linux/howto/ax25/part2
Last-modified: 4 May 96

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*** The `Linux AX25 HOWTO' is posted automatically by the
*** Linux HOWTO coordinator, Greg Hankins <gregh@sunsite.unc.edu>.  Please
*** direct any comments or questions about this HOWTO to the author,
*** Terry Dawson <terry@perf.no.itg.telecom.com.au>.

- --- BEGIN Linux AX25 HOWTO part 2/2 ---

       echo "  Routing:"
       /sbin/route add default gw 44.136.8.68 window 1024 sl0
       echo "    default route."
       echo done.

       # end

  �  You must have IP_FORWARDING enabled in your kernel.

  �  The AX.25 configuration files are pretty much those used as
     examples in the earlier sections, refer to those where necessary.

  �  I've chosen to use an IP address for my radio port that is not
     within my home network block. I needn't have done so, I could have
     easily used 44.136.8.97 for that port too.

  �  44.136.8.68 is my local IPIP encapsulated gateway and hence is
     where I point my default route.

  �  Each of the machines on my Ethernet network have a route:

       route add -net 44.0.0.0 gw 44.136.8.97 window 512 mss 512 eth0

  The use of the mss and window parameters means that I can get optimum
  performance from both local Ethernet and radio based connections.

  �  I also run my sendmail, http, ftp and other daemons on the router
     machine so that it needs to be the only machine to provide others
     with facilities.

  �  The router machine is a lowly 386DX20 with a 20Mb harddrive.

  14.2.  IPIP encapsulated gateway configuration.

  Linux is now very commonly used for tcp/ip encapsulated gateways
  around the world. The new tunnel driver supports multiple encapsulated
  routes and makes the older ipip daemon obsolete.

  A typical configuration would look similar to the following.

                                                 .      .   .    .    . .
         ---                                .
          | Network       /---------\     .    Network
          | 154.27.3/24   |         |    .     44.136.16/24       \ | /
          |               | Linux   |   .                          \|/
          |               |         |  .                            |
          |          eth0 | IPIP    |  .  /-----\    /----------\   |
       ---|---------------|         |-----| TNC |----| Radio    |---/
          |   154.27.3.20 | Gateway |  .  \-----/    \----------/
          |               |         | sl0
          |               |         | 44.136.16.1
          |               |         |    .
          |               |         |     .
          |               \_________/       .
         ---                                     .      .   .    .    . .

  The configuration files of interest are:

  # /etc/rc.net
  # This file is a simple configuration that provides one KISS AX.25
  # radio port, one Ethernet device, and utilises the kernel tunnel driver
  # to perform the IPIP encapsulation/decapsulation
  #
  echo "/etc/rc.net"
  echo "  Configuring:"
  #
  echo -n "    loopback:"
  /sbin/ifconfig lo 127.0.0.1
  /sbin/route add 127.0.0.1
  echo " done."
  #
  echo -n "    ethernet:"
  /sbin/ifconfig eth0 154.27.3.20 netmask 255.255.255.0 \
                  broadcast 154.27.3.255 up
  /sbin/route add 154.27.3.20 eth0
  /sbin/route add -net 154.27.3.0 netmask 255.255.255.0 eth0
  echo " done."
  #
  echo -n "    AX.25: "
  /usr/local/sbin/axattach -s 4800 /dev/ttyS1 VK2KTJ-0 &
  sleep 2
  /sbin/ifconfig sl0 44.136.16.1 netmask 255.255.255.0 \
                  broadcast 44.136.16.255 mtu 512 up
  /sbin/route add 44.136.16.1 sl0
  /sbin/route add -net 44.136.16.0 netmask 255.255.255.0 window 1024 sl0
  #
  echo -n "    tunnel:"
  /sbin/ifconfig tunl0 44.136.16.1 mtu 512 up
  #
  echo done.
  #
  echo -n "Routing ... "
  source /etc/ipip.routes
  echo done.
  #
  # end.

  and:

       # /etc/ipip.routes
       # This file is generated using the munge script
       #
       /sbin/route add 44.134.8.0 netmask 255.255.255.0 tunl0 gw 134.43.26.1
       /sbin/route add 44.34.9.0 netmask 255.255.255.0 tunl0 gw 174.84.6.17
       /sbin/route add 44.13.28.0 netmask 255.255.255.0 tunl0 gw 212.37.126.3
          ...
          ...
          ...

  Some points to note here are:

  �  The new tunnel driver uses the gw field in the routing table in
     place of the pointopoint parameter to specify the address of the
     remote IPIP gateway. This is why it now supports multiple routes
     per interface.
  �  You can configure two network devices with the same address.  In
     this example both the sl0 and the tunl0 devices have been
     configured with the IP address of the radio port. This is done so
     that the remote gateway sees the correct address from your gateway
     in encapsulated datagrams sent to it.

  �  The route commands used to specify the encapsulated routes can be
     automatically generated by a modified version of the munge script.
     This is included below. The route commands would then be written to
     a separate file and read in using the bash source /etc/ipip.routes
     command (assuming you called the file with the routing commands
     /etc/ipip.routes) as illustrated. The source file must be in the
     NOS route command format.

  �  Note the use of the mtu and window arguments on the ifconfig and
     route commands where appropriate. Setting these parameters to
     appropriate values improves the performance of your radio link.

  The new tunnel-munge script:

  #!/bin/sh
  #
  # From: Ron Atkinson <n8fow@hamgate.cc.wayne.edu>
  #
  #  This script is basically the 'munge' script written by Bdale N3EUA
  #  for the IPIP daemon and is modified by Ron Atkinson N8FOW. It's
  #  purpose is to convert a KA9Q NOS format gateways route file
  #  (usually called 'encap.txt') into a Linux routing table format
  #  for the IP tunnel driver.
  #
  #        Usage: Gateway file on stdin, Linux route format file on stdout.
  #               eg.  tunnel-munge < encap.txt > ampr-routes
  #
  # NOTE: Before you use this script be sure to check or change the
  #       following items:
  #
  #     1) Change the 'Local routes' and 'Misc user routes' sections
  #        to routes that apply to your own area (remove mine please!)
  #     2) On the fgrep line be sure to change the IP address to YOUR
  #        gateway Internet address. Failure to do so will cause serious
  #        routing loops.
  #     3) The default interface name is 'tunl0'. Make sure this is
  #        correct for your system.

  echo "#"
  echo "# IP tunnel route table built by $LOGNAME on `date`"
  echo "# by tunnel-munge script v960307."
  echo "#"
  echo "# Local routes"
  echo "route add -net 44.xxx.xxx.xxx netmask 255.mmm.mmm.mmm dev sl0"
  echo "#"
  echo "# Misc user routes"
  echo "#"
  echo "# remote routes"

  fgrep encap | grep "^route" | grep -v " XXX.XXX.XXX.XXX" | \
  awk '{
          split($3, s, "/")
          split(s[1], n,".")
          if      (n[1] == "")    n[1]="0"
          if      (n[2] == "")    n[2]="0"
          if      (n[3] == "")    n[3]="0"
          if      (n[4] == "")    n[4]="0"
          if      (s[2] == "1")   mask="128.0.0.0"
          else if (s[2] == "2")   mask="192.0.0.0"
          else if (s[2] == "3")   mask="224.0.0.0"
          else if (s[2] == "4")   mask="240.0.0.0"
          else if (s[2] == "5")   mask="248.0.0.0"
          else if (s[2] == "6")   mask="252.0.0.0"
          else if (s[2] == "7")   mask="254.0.0.0"
          else if (s[2] == "8")   mask="255.0.0.0"
          else if (s[2] == "9")   mask="255.128.0.0"
          else if (s[2] == "10")  mask="255.192.0.0"
          else if (s[2] == "11")  mask="255.224.0.0"
          else if (s[2] == "12")  mask="255.240.0.0"
          else if (s[2] == "13")  mask="255.248.0.0"
          else if (s[2] == "14")  mask="255.252.0.0"
          else if (s[2] == "15")  mask="255.254.0.0"
          else if (s[2] == "16")  mask="255.255.0.0"
          else if (s[2] == "17")  mask="255.255.128.0"
          else if (s[2] == "18")  mask="255.255.192.0"
          else if (s[2] == "19")  mask="255.255.224.0"
          else if (s[2] == "20")  mask="255.255.240.0"
          else if (s[2] == "21")  mask="255.255.248.0"
          else if (s[2] == "22")  mask="255.255.252.0"
          else if (s[2] == "23")  mask="255.255.254.0"
          else if (s[2] == "24")  mask="255.255.255.0"
          else if (s[2] == "25")  mask="255.255.255.128"
          else if (s[2] == "26")  mask="255.255.255.192"
          else if (s[2] == "27")  mask="255.255.255.224"
          else if (s[2] == "28")  mask="255.255.255.240"
          else if (s[2] == "29")  mask="255.255.255.248"
          else if (s[2] == "30")  mask="255.255.255.252"
          else if (s[2] == "31")  mask="255.255.255.254"
          else                    mask="255.255.255.255"

  if (mask == "255.255.255.255")
          printf "route add -host %s.%s.%s.%s gw %s dev tunl0\n"\
                  ,n[1],n[2],n[3],n[4],$5
  else
          printf "route add -net %s.%s.%s.%s gw %s netmask %s dev tunl0\n"\
                  ,n[1],n[2],n[3],n[4],$5,mask
   }'

  echo "#"
  echo "# default the rest of amprnet via mirrorshades.ucsd.edu"
  echo "route add -net 44.0.0.0 gw 128.54.16.18 netmask 255.0.0.0 dev tunl0"
  echo "#"
  echo "# the end"

  15.  Discussion relating to Amateur Radio and Linux.

  There are various places that discussion relating to Amateur Radio and
  Linux take place. They take place in the comp.os.linux.* newsgroups,
  they also take place on the HAMS list on vger.rutgers.edu. Other
  places where they are held include the tcp-group mailing list at
  ucsd.edu (the home of amateur radio tcp/ip discussions), and you might
  also try the #linpeople channel on the linuxnet irc network.

  To join the Linux linux-hams channel on the mail list server, send
  mail to:

       Majordomo@vger.rutgers.edu

  with the line:

       subscribe linux-hams

  in the message body. The subject line is ignored.

  To join the tcp-group send mail to:

       listserver@ucsd.edu

  with the line:
       subscribe tcp-group

  in the body of the text.

  Note: Please remember that the tcp-group is primarily for discussion
  of the use of advanced protocols, of which tcp/ip is one, in Amateur
  Radio. Linux specific questions should not ordinarily go there.

  16.  Copyright.

  The HAM-HOWTO, an introduction to Amateur Radio software available for
  Linux and information on how to configure some of it.  Copyright (c)
  1996 Terry Dawson.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or (at
  your option) any later version.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the:

  Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
  USA.


- --- END Linux AX25 HOWTO part 2/2 ---

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