PPP ip-up/ip-down for vpn with optional dns resolving

ip-down

#!/bin/sh

# install into /etc/ppp/ip-down
# chmod a+x /etc/ppp/ip-down

source /etc/ppp/ip.config

case "${IPREMOTE}" in
  ${MY_IPREMOTE})
    /sbin/route delete ${MY_ROUTE} -interface ${IFNAME}
    mv ${RESOLV_CONF}.ip-up ${RESOLV_CONF}
    ;;
  esac

exit 0

ip-up

#!/bin/sh

# install into /etc/ppp/ip-up
# chmod a+x /etc/ppp/ip-up

source /etc/ppp/ip.config

if [ "${DUMP_ENV}" = "yes" ]; then
  env > /tmp/ip-up.env
fi

case "${IPREMOTE}" in
  ${MY_IPREMOTE})
    /sbin/route add ${MY_ROUTE} -interface ${IFNAME}
    cp ${RESOLV_CONF} ${RESOLV_CONF}.ip-up
    echo "nameserver ${MY_NAMESERVER}" >> ${RESOLV_CONF}
    ;;
esac
exit 0

ip.config

#!/bin/sh

# Dump the current environment to a log file for debugging
DUMP_ENV=yes

# The ip address of the vpn gateway, probaby connect to the vpn 
MY_IPREMOTE="a.b.c.d"

# The nameserver to you want to use if your VPN server doesn't send it
# You might also look at the $DNS1, $DNS2 vars spit out from the env dump
MY_NAMESERVER="a.b.c.d"

# The route to add to send through the ppp interface
MY_ROUTE="a.b.c/16"

# The resolv.conf file to update. By default on mac osx /etc/resolv.conf is a
# symlink to /var/run/resolv.conf
RESOLV_CONF=/var/run/resolv.conf
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