share/examples/netgraph/udp.tunnel

   1 #!/bin/sh
   2 # $FreeBSD$
   3
   4 # This script sets up a virtual point-to-point WAN link between
   5 # two subnets, using UDP packets as the ``WAN connection.''
   6 # The two subnets might be non-routable addresses behind a
   7 # firewall.
   8 #
   9
  10 # Here define the local and remote inside networks as well
  11 # as the local and remote outside IP addresses and UDP port
  12 # number that will be used for the tunnel.
  13 #
  14 LOC_INTERIOR_IP=192.168.1.1
  15 LOC_EXTERIOR_IP=1.1.1.1
  16 REM_INTERIOR_IP=192.168.2.1
  17 REM_EXTERIOR_IP=2.2.2.2
  18 REM_INSIDE_NET=192.168.2.0
  19 UDP_TUNNEL_PORT=4028
  20
  21 # Create the interface node ``ng0'' if it doesn't exist already,
  22 # otherwise just make sure it's not connected to anything.
  23 # In FreeBSD, interfaces cannot be removed so it might already
  24 # be there from before.
  25 #
  26 if ifconfig ng0 >/dev/null 2>&1; then
  27         ifconfig ng0 inet down delete >/dev/null 2>&1
  28         ngctl shutdown ng0:
  29 else
  30         ngctl mkpeer iface dummy inet
  31 fi
  32
  33 # Attach a UDP socket to the ``inet'' hook of the interface node
  34 # using the ng_ksocket(4) node type.
  35 #
  36 ngctl mkpeer ng0: ksocket inet inet/dgram/udp
  37
  38 # Bind the UDP socket to the local external IP address and port
  39 #
  40 ngctl msg ng0:inet bind inet/${LOC_EXTERIOR_IP}:${UDP_TUNNEL_PORT}
  41
  42 # Connect the UDP socket to the peer's external IP address and port
  43 #
  44 ngctl msg ng0:inet connect inet/${REM_EXTERIOR_IP}:${UDP_TUNNEL_PORT}
  45
  46 # Configure the point-to-point interface
  47 #
  48 ifconfig ng0 ${LOC_INTERIOR_IP} ${REM_INTERIOR_IP}
  49
  50 # Add a route to the peer's interior network via the tunnel
  51 #
  52 route add ${REM_INSIDE_NET} ${REM_INTERIOR_IP}
  53