PREUN

/bin/sh

/usr/share/rpm-helper/del-service iptables $1 iptables

POSTIN

/bin/sh

/usr/share/rpm-helper/add-service iptables $1 iptables 
# run only on fresh installation
if [ $1 = 1 ]; then
    /sbin/service iptables check
fi

Triggers

iptables < 1.2.9-8mdk

/bin/sh

# fix upgrade from mdk < 10.2
/sbin/service iptables check