Something

#!/bin/sh
#
# ip-up script for ddclient

# # These variables are for the use of the scripts run by run-parts
# PPP_IFACE="$1"
# PPP_TTY="$2"
# PPP_SPEED="$3"
# PPP_LOCAL="$4"
# PPP_REMOTE="$5"
# PPP_IPPARAM="$6"


if [ $5 = "203.59.49.167" ]; then
        route add -host 203.59.49.167 gw 10.123.123.254
        route add -host 203.59.49.168 gw 10.123.123.254
        route add -net 10.13.0.0/16 $1
        route add -net 10.23.0.0/16 $1
        route add -net 10.40.0.0/16 $1
        route add -net 10.25.0.0/16 $1
        route add -net 10.21.0.0/16 $1
        route add -net 10.22.0.0/16 $1
        route add -net 10.55.0.0/16 $1
        route add -net 10.36.0.0/16 $1
        route add -net 10.41.0.0/16 $1

fi
if [ $5 = "203.59.49.168" ]; then
        route add -host 203.59.49.167 gw 10.123.123.254
        route add -host 203.59.49.168 gw 10.123.123.254
        route add -net 10.13.0.0/16 $1
        route add -net 10.23.0.0/16 $1
        route add -net 10.40.0.0/16 $1
        route add -net 10.25.0.0/16 $1
        route add -net 10.21.0.0/16 $1
        route add -net 10.22.0.0/16 $1
        route add -net 10.55.0.0/16 $1
        route add -net 10.36.0.0/16 $1
        route add -net 10.41.0.0/16 $1
fi
if [ $5 = "203.59.25.253" ]; then
        route add -net 10.2.0.0/16 $1
        route add -host 203.59.24.249 gw 10.123.123.254
        route add -host 203.59.130.80 gw 10.123.123.254
        route add -net 10.59.0.0 netmask 255.255.0.0 $1
        route add -net 203.59.130.0 netmask 255.255.255.0 $1
        route add -host 203.59.24.51 $1
fi
if [ $5 = "203.59.25.252" ]; then
        route add -net 10.2.0.0/16 $1
        route add -host 203.59.24.249 gw 10.123.123.254
        route add -host 203.59.130.80 gw 10.123.123.254
        route add -net 10.59.0.0 netmask 255.255.0.0 $1
        route add -net 203.59.130.0 netmask 255.255.255.0 $1
        route add -host 203.59.24.51 $1
fi