OS X VPN client pppd host route configuration on post-interface connection
VPN Client PPP daemon configuration
Recipe: Configure Default Host routes after a specific VPN connection has been established
Solution:
In order to configure the host (or network routes, although I’m solely interested in routing specific hosts
between my two sites), we need to create a file with the following commands in /etc/ppp.
#!/bin/sh
# VPN_GATEWAY is the remote address of the vpn tunnel
# when ppp executes this script it will pass several values to it
# $5 will hold the remote gateway
VPN_GATEWAY=192.168.1.156
if [ "${5:-}" = "${VPN_GATEWAY}" ]
then
/bin/echo "${5:-} routes added for interface ${5:-}" > "/tmp/pppd_ip_up_$$.log"
/sbin/route add -host 192.168.1.92 -interface ppp0 || (/bin/echo "failed to add route 92" >> "/tmp/pppd_ip_up_$$.log")
/sbin/route add -host 192.168.1.158 -interface ppp0|| (/bin/echo "failed to add route 158" >> "/tmp/pppd_ip_up_$$.log")
/sbin/route add -host 192.168.1.56 -interface ppp0|| (/bin/echo "failed to add route 56" >> "/tmp/pppd_ip_up_$$.log")
/sbin/route add -host 192.168.1.26 -interface ppp0|| (/bin/echo "failed to add route 26" >> "/tmp/pppd_ip_up_$$.log")
else
/bin/echo "No routes added for interface ${5:-}" > "/tmp/pppd_ip_up_$$.log"
fi
This script must be owned by root and executable. We can create multiple else clauses to configure routes for our remote VPN connection
based on the remote IP Address. I’ve added a log to /tmp to monitor the process.
