3 # enable access to WAN device on router node from LAN clients
9 # IFACE physical name of the interface being processed
10 # METHOD method of the interface (e.g., static)
11 # MODE start if run from ifup, stop if run from ifdown
12 # PHASE as per MODE, but with finer granularity, distinguishing the pre-
13 # up, post-up, pre-down and post-down phases.
15 LANIF="${1:?"usage: $0 <LAN_device> "}"
17 LANIP=`/sbin/ip addr show dev ${LANIF} | grep -w inet | tr -s ' ' | cut -d ' ' -f 3 | cut -d / -f 1`
18 LANMASK=`/sbin/ip route show dev ${LANIF} | grep -w ${LANIP} | tr -s ' ' | cut -d ' ' -f 1`
20 WANIP=`/sbin/ip addr show dev ${IFACE} | grep -w inet | tr -s ' ' | cut -d ' ' -f 3 | cut -d / -f 1`
22 if [ "${PHASE}" = "pre-down" ]; then
23 # delete rule and exit
24 /sbin/iptables -t nat -D PREROUTING -i ${LANIF} -s ${LANMASK} -d ${WANIP} -j DNAT --to-destination ${LANIP}
25 echo "remove rule for access to WAN device on router node from LAN clients"
34 /sbin/iptables -t nat -A PREROUTING -i ${LANIF} -s ${LANMASK} -d ${WANIP} -j DNAT --to-destination ${LANIP}
35 echo "set rule for access to WAN device on router node from LAN clients"