share/examples/netgraph/udp.tunnel

   1 #!/bin/sh
   2 # $FreeBSD: src/share/examples/netgraph/udp.tunnel,v 1.1 2000/01/28 00:44:30 archie Exp $
   3 # $DragonFly: src/share/examples/netgraph/udp.tunnel,v 1.2 2003/06/17 04:36:57 dillon Exp $
   4
   5 # This script sets up a virtual point-to-point WAN link between
   6 # two subnets, using UDP packets as the ``WAN connection.''
   7 # The two subnets might be non-routable addresses behind a
   8 # firewall.
   9 #
  10
  11 # Here define the local and remote inside networks as well
  12 # as the local and remote outside IP addresses and UDP port
  13 # number that will be used for the tunnel.
  14 #
  15 LOC_INTERIOR_IP=192.168.1.1
  16 LOC_EXTERIOR_IP=1.1.1.1
  17 REM_INTERIOR_IP=192.168.2.1
  18 REM_EXTERIOR_IP=2.2.2.2
  19 REM_INSIDE_NET=192.168.2.0
  20 UDP_TUNNEL_PORT=4028
  21
  22 # Create the interface node ``ng0'' if it doesn't exist already,
  23 # otherwise just make sure it's not connected to anything.
  24 # In FreeBSD, interfaces cannot be removed so it might already
  25 # be there from before.
  26 #
  27 if ifconfig ng0 >/dev/null 2>&1; then
  28         ifconfig ng0 inet down delete >/dev/null 2>&1
  29         ngctl shutdown ng0:
  30 else
  31         ngctl mkpeer iface dummy inet
  32 fi
  33
  34 # Attach a UDP socket to the ``inet'' hook of the interface node
  35 # using the ng_ksocket(8) node type.
  36 #
  37 ngctl mkpeer ng0: ksocket inet inet/dgram/udp
  38
  39 # Bind the UDP socket to the local external IP address and port
  40 #
  41 ngctl msg ng0:inet bind inet/${LOC_EXTERIOR_IP}:${UDP_TUNNEL_PORT}
  42
  43 # Connect the UDP socket to the peer's external IP address and port
  44 #
  45 ngctl msg ng0:inet connect inet/${REM_EXTERIOR_IP}:${UDP_TUNNEL_PORT}
  46
  47 # Configure the point-to-point interface
  48 #
  49 ifconfig ng0 ${LOC_INTERIOR_IP} ${REM_INTERIOR_IP}
  50
  51 # Add a route to the peer's interior network via the tunnel
  52 #
  53 route add ${REM_INSIDE_NET} ${REM_INTERIOR_IP}
  54