/etc/ppp/ip-up.d/1000-policyroute.sh

1000-policyroute.sh

#!/bin/sh
#
# This script is called with the following arguments:
#    Arg  Name               Example
#    $1   Interface name     ppp0
#    $2   The tty            ttyS1
#    $3   The link speed     38400
#    $4   Local IP number    12.34.56.78
#    $5   Peer  IP number    12.34.56.99

pppIfName=$1
pppTty=$2
pppIp=$4
pppPeerIp=$5

# ignore dial-up line.
[ $pppTty ] && exit

# duplicate routing table
#ip route list table main | egrep -v '^default' | while read line
#do
#       ip route add $line table $pppIfName
#done

# flush routing table
ip route flush table $pppIfName

# add the route in the ppp-specific table
ip route add $pppIp dev $pppIfName table $pppIfName
ip route add $pppPeerIp via $pppIp table $pppIfName
ip route add default via $pppIp table $pppIfName

# remove the route in the main/local table
ip route del $pppPeerIp table main
ip route del $pppIp table local