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54 lines
1.5 KiB
Bash
54 lines
1.5 KiB
Bash
#!/bin/sh
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# $FreeBSD$
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# This script sets up a virtual point-to-point WAN link between
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# two subnets, using UDP packets as the ``WAN connection.''
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# The two subnets might be non-routable addresses behind a
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# firewall.
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#
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# Here define the local and remote inside networks as well
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# as the local and remote outside IP addresses and UDP port
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# number that will be used for the tunnel.
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#
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LOC_INTERIOR_IP=192.168.1.1
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LOC_EXTERIOR_IP=1.1.1.1
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REM_INTERIOR_IP=192.168.2.1
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REM_EXTERIOR_IP=2.2.2.2
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REM_INSIDE_NET=192.168.2.0
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UDP_TUNNEL_PORT=4028
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# Create the interface node ``ng0'' if it doesn't exist already,
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# otherwise just make sure it's not connected to anything.
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# In FreeBSD, interfaces cannot be removed so it might already
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# be there from before.
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#
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if ifconfig ng0 >/dev/null 2>&1; then
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ifconfig ng0 inet down delete >/dev/null 2>&1
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ngctl shutdown ng0:
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else
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ngctl mkpeer iface dummy inet
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fi
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# Attach a UDP socket to the ``inet'' hook of the interface node
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# using the ng_ksocket(4) node type.
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#
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ngctl mkpeer ng0: ksocket inet inet/dgram/udp
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# Bind the UDP socket to the local external IP address and port
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#
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ngctl msg ng0:inet bind inet/${LOC_EXTERIOR_IP}:${UDP_TUNNEL_PORT}
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# Connect the UDP socket to the peer's external IP address and port
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#
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ngctl msg ng0:inet connect inet/${REM_EXTERIOR_IP}:${UDP_TUNNEL_PORT}
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# Configure the point-to-point interface
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#
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ifconfig ng0 ${LOC_INTERIOR_IP} ${REM_INTERIOR_IP}
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# Add a route to the peer's interior network via the tunnel
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#
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route add ${REM_INSIDE_NET} ${REM_INTERIOR_IP}
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