Listing 2 Creating post-configuration scripts
# cd /var/bootcd/s0/Solaris_8/Product/packages
# cat > netconf
#!/usr/bin/ksh

if [[ $# -ne 1 ]]
then
    echo "Usage: ${0} "
    exit 1
fi

PATH=${PATH}:.
if [ ! -f ${1} ]
then
    echo "ERROR: File ${1} not found"
    exit 1
fi

. ${1}

echo "The following configuration is going to be applied:"
echo "  IP address       : ${IP_ADDRESS}"
echo "  Network address  : ${NET_ADDRESS}"
echo "  Netmask          : ${NETMASK}"
echo "  Gateway          : ${GATEWAY}"
echo "  Hostname         : ${HOSTNAME}"
if [ ! -z ${DOMAINNAME} ]
then
echo "  Default domain   : ${DOMAINNAME}"
fi
echo ""

# --- /etc/hosts

echo "Configuring /etc/hosts ..."
if [ -f /etc/hosts ]; then
    cp /etc/hosts /etc/hosts.bak.$$
fi
grep -v ${HOSTNAME} /etc/hosts > /etc/hosts.tmp.$$
cat /etc/hosts.tmp.$$ > /etc/hosts
echo "${IP_ADDRESS}    ${HOSTNAME} ${HOSTNAME}.${DOMAINNAME}" \
  >> /etc/hosts
rm /etc/hosts.tmp.$$

# --- /etc/netmasks

echo "Configuring /etc/netmasks ..."
if [ -f /etc/netmasks ]; then
    cp /etc/netmasks /etc/netmasks.bak.$$
fi
grep -v ${NET_ADDRESS} /etc/netmasks > /etc/netmasks.tmp.$$
cat /etc/netmasks.tmp.$$ > /etc/netmasks
echo "${NET_ADDRESS}    ${NETMASK}" >> /etc/netmasks
rm /etc/netmasks.tmp.$$

# --- /etc/hostname.

DEVICES="eri bge hme ce"
for dev in ${DEVICES}
do
    grep "\"${dev}\"" /etc/path_to_inst > /dev/null 2>&1
    if [ $? = 0 ]
    then
        DEVICE=${dev}0
    fi
done
echo "Configuring /etc/hostname.${DEVICE} ... "
if [ -f /etc/hostname.${DEVICE} ]; then
    cp /etc/hostname.${DEVICE} /etc/hostname.${DEVICE}.bak.$$
fi
echo "${HOSTNAME}" > /etc/hostname.${DEVICE}

# --- /etc/defaultrouter

echo "Configuring /etc/defaultrouter ... "
if [ -f /etc/defaultrouter ]; then
    cp /etc/defaultrouter /etc/deflaultrouter.bak.$$
fi
echo "${GATEWAY}" > /etc/defaultrouter

# --- /etc/nodename

echo "Configuring /etc/nodename ... "
if [ -f /etc/nodename ]; then
    cp /etc/nodename /etc/nodename.bak.$$
fi
echo "${HOSTNAME}" > /etc/nodename

# --- /etc/defaultdomain

echo "Configuring /etc/defaultdomain ... "
if [ ! -z ${DOMAINNAME} ]
then
    if [ -f /etc/defaultdomain ]; then
        cp /etc/defaultdomain /etc/defaultdomain.bak.$$
    fi
    echo "${DOMAINNAME}" > /etc/defaultdomain
fi

# --- Apply changes live

echo "Applying changes ... \c"
ifconfig ${DEVICE} plumb
ifconfig ${DEVICE} ${IP_ADDRESS} netmask ${NETMASK} up
route add default ${GATEWAY}
domainname ${DOMAINNAME}
hostname ${HOSTNAME}
echo "done."

^D
# chmod +x netconf
Sample configuration file: 

# cat > network.conf
#
# IP address of the host
#
IP_ADDRESS=
#
# This is the base address of the network
#
NET_ADDRESS=
#
# Netmask
#
NETMASK=255.255.255.0
#
# Default gateway
#
GATEWAY=
#
# Hostname
#
HOSTNAME="preinst"
#
# Domain name (can stay empty, if not needed)
#
DOMAINNAME=""

^D

