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|
#!/bin/dash
VERBOSE=1
LOCAL_V6_ADDR='::1/64'
TUNNEL_IF='sit0'
RELAY='192.88.99.1'
case "$1" in
start)
if [ -z "$LOCAL4" ]; then
if [ -z "$LOCAL_IF" ]; then
LOCAL_IF=$(ip -o route show \
|sed -nre '/^default /s/^default .*dev ([^ ]+).*/\1/p')
fi
LOCAL4=$(ip -o addr show $LOCAL_IF | grep ' inet ' \
| grep -v ' secondary ' | head -n 1 \
| sed -e 's/.*inet \([^ ]*\) .*/\1/' -e 's/\/.*//')
if [ -z "$LOCAL4" ]; then
echo "Cannot find the IP address assigned to $LOCAL_IF"
exit 1
fi
fi
SUBNET=$(printf "%x%02x:%x%02x" $(echo $LOCAL4 | sed -e 's/\./ /g'))
LOCAL6NET="2002:${SUBNET}"
LOCAL6="${LOCAL6NET}${LOCAL_V6_ADDR}"
if [ "$VERBOSE" ]; then
echo "Local v4 address: $LOCAL4"
echo "Local v6 address: $LOCAL6"
echo "6to4 relay address: $RELAY"
fi
ip link set $TUNNEL_IF up
ip addr add $LOCAL6 dev $TUNNEL_IF
ip route add 2000::/3 via ::$RELAY
ip route add $LOCAL6NET dev lo 2> /dev/null || true
;;
stop)
ip link set $TUNNEL_IF down
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
;;
esac
exit 0
|
