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# $FreeBSD: release/9.1.0/share/examples/ppp/ppp.conf.span-isp 138815 2004-12-13 17:54:30Z brian $

# This advanced ppp configuration file explains how to implement
# the following:
#
#    -------------       -------------       -------------
#    |   host1   |       |   host2   |       |   host3   |
#    -------------       -------------       -------------
#          |                       |               |
#     |---------------------- LAN ----------------------|
#                          |
#                        -------------
#                        |  Gateway  |
#                        -------------
#                              |
#             -----------------------------------
#             |          |           |          |
#            isp1       isp2       isp3       ispN
#             |          |           |          |
#             -----------------------------------
#                              |
#                         ------------
#                         | Receiver |
#                         ------------
#                              |
#                          Internet
#
# The connection is implemented so that any ISP connection can go down
# without loss of connectivity between the LAN and the Internet.  It is
# of course also possible to shut down any link manually.
#
# There is a working example in ppp.*.span-isp.working that can be tested
# on a single machine !
#
#
# Prerequisites:
#
# o The Receiver machine must be in the outside world and must be willing
#   to accept a multilink ppp connection over UDP, assigning a routable IP
#   number to the Gateway machine.  This probably means that it must be
#   a *BSD box as I know of no other ppp implementations that can use UDP
#   as a transport.
#
# o The Receiver machine must be multi-homed with at least N+1 addresses
#   where N is the maximun number of ISPs that you wish to use
#   simultaneously.  We assume the IP numbers to be RIP1, RIP2 ... RIPN.
#   REAL-LOCAL-IP is the real IP number of the Receiver machine (and must
#   not be the same as any of the RIP* numbers).
#
# o Both the Gateway and the Receiver machines must have several tun
#   interfaces configured into the kernel (see below).
#
# o Both the Gateway and the Receiver machines must have the following
#   entry in /etc/services:
#
#      ppp 6671/udp
#
#   The port number isn't important, but it must be consistent across
#   machines.
#
# o The Receiver machine must have the following entry in
#   /etc/inetd.conf:
#
#      ppp dgram udp wait root /usr/sbin/ppp ppp -direct vpn-in
#
#   Note: Because inetd ``wait''s for ppp to finish, a single ppp
#         invocation receives all incoming packets.  This creates
#         havoc with LQR magic number checks, so LQR *must not* be
#         enabled.
#         Also, -direct invocations of ppp do sendto()s using the
#         address that was last recvfrom()d.  This means that the
#         returning traffic is a bit unbalanced.  Perhaps ppp should
#         be smart enough to automatically clone an existing link
#         when it detects a new incoming address.... tricky !
#
# If you use ppp to connect to your ISPs, the isp* profiles shold be used,
# resulting in the vpn* profiles being called from ppp.linkup.span-isp.
# These invocations will bond together into a MP ppp invocation.
#
# If the link to your ISP is via another type of interface (cable modem
# etc), simply configure the interface with a netmask of 0xffffffff and
# add a route to RIPN via the interface address (no default).  You can
# then start ppp using the vpn-nic label.
#
# The Receiver machine should have N tun interfaces (where N is the maximum
# number of ISPs that you wish to use simultaneously).  The Gateway machine
# requires N interfaces plus an additional N interfaces (total 2 * N) if
# you're using ppp to talk to the ISPs.

# Using ppp to connect to your ISPs (PPP over UDP over PPP):
#
# When we connect to our ISPs using ppp, we start the MP ppp invocation
# from ppp.linkup (see ppp.linkup.span-isp) for each link.  We also remove
# the link from ppp.linkdown (see ppp.linkdown.span-isp).  This is necessary
# because relying on our LQR strategy (dropping the link after 5 missing
# replies) is just too slow to be practical in this environment.
#
# This works because the MP invocations are smart enough to recognise that
# another process is already running and to pass the link over to that
# running version.
#
# Only the ISP links should be started manually.  When they come up, they'll
# start the MP invocation.

default:
  set speed 115200
  set device /dev/cuad0 /dev/cuad1 /dev/cuad2 /dev/cuad3
  set dial "ABORT BUSY ABORT NO\\sCARRIER ABORT NO\\sDIAL\\sTONE TIMEOUT 4 \
            \"\" ATZ OK-ATZ-OK ATDT\\T TIMEOUT 60 CONNECT \\c \\n"
  set login
  set redial 3 5
  set timeout 0
  enable lqr echo
  set lqrperiod 15

isp1:
  set phone "1234567"
  set authname "isp1name"
  set authkey "isp1key"
  add! RIP1/32 HISADDR

isp2:
  set phone "2345678"
  set authname "isp2name"
  set authkey "isp2key"
  add! RIP2/32 HISADDR

ispN:
  set phone "3456789"
  set authname "ispNname"
  set authkey "ispNkey"
  add! RIPN/32 HISADDR


# Our MP version of ppp.  vpn is a generic label used by each of the
# other vpn invocations by envoking ppp with both labels (see
# ppp.linkup.span-isp).
# Each ``set device'' command tells ppp to use UDP packets destined for
# the given IP/port as the link (transport).  The routing table will
# ensure that these UDP packets use the correct ISP connection.

vpn:
  set enddisc LABEL
  set speed sync
  set mrru 1500
  set mru 1504			# Room for the MP header
  nat enable yes
  set authname "vpnname"
  set authkey "vpnkey"
  add! default HISADDR
  disable deflate pred1 lqr
  deny deflate pred1
 
vpn1:
  rename 1
  set device RIP1:ppp/udp
 
vpn2:
  rename 2
  set device RIP2:ppp/udp
 
vpnN:
  rename N
  set device RIPN:ppp/udp

vpn-nic:
  load vpn
  clone 1 2 N
  link deflink rm
  link 1 set device RIP1:ppp/udp
  link 2 set device RIP2:ppp/udp
  link N set device RIPN:ppp/udp

# The Receiver profile is a bit more straight forward, as it doesn't need
# to get bogged down with sublinks.  Replace REAL-ASSIGNED-IP with the
# IP number to be assigned to the Gateway machine.  Replace REAL-LOCAL-IP
# with the real IP number of the Receiver machine.
#
# No other entries are required on the Receiver machine, and this entry
# is not required on the Gateway machine.  The Receiver machine also
# requires the contents of ppp.secret.span-isp.
#
# Of course it's simple to assign an IP block to the client with a simple
# ``add'' command, and then have the client use those IP numbers on its
# LAN rather than using ``nat enable yes''.

vpn-in:
  set enddisc label
  set speed sync
  set mrru 1500
  set mru 1504			# Room for the MP header
  enable chap
  disable lqr
  set ifaddr REAL-LOCAL-IP REAL-ASSIGNED-IP

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