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- #! /usr/bin/env sh
-
- usage()
- {
- echo "Usage: ${0} internal_iface external_iface (on|off)" >&2
- exit 1
- }
-
- if [ "${#}" -ne 3 ]
- then
- usage
- fi
-
- internal_iface="${1}"
- external_iface="${2}"
- status="${3}"
-
- if [ "${status}" = "on" ]
- then
- flag="-A"
- elif [ "${status}" = "off" ]
- then
- flag="-D"
- else
- usage
- fi
-
- iptables -t nat "${flag}" POSTROUTING -o "${external_iface}" -j MASQUERADE
- iptables "${flag}" FORWARD -i "${external_iface}" -o "${internal_iface}" -m state --state RELATED,ESTABLISHED -j ACCEPT
- iptables "${flag}" FORWARD -i "${internal_iface}" -o "${external_iface}" -j ACCEPT
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