Script to keep VPN alive on Synology DSM. Checks if IP is pingable and if not: disconnect VPN, reconnect VPN & add routes

syno-vpn-keepalive.sh

# syno-vpn-keepalive.sh 
# ---
# Script to keep VPN alive on Synology DSM. 
# Checks if IP is pingable and if not:
#  disconnect VPN, reconnect VPN & add routes
# ---
# Modify vars: 
# - CHECKIP: IP to check to be pingable before reconnecting VPN
# - NAME (Synology VPN name), 
# - ID (Synology VPN ID), SSH to NAS & run this to find ID
#    sudo grep conf_id /usr/syno/etc/synovpnclient/vpnc_last_connect
# - PROTO (pptp|l2tp|openvpn), 
# - DEV 
#     VPN network device - 
#     check using ifconfig while VPN connected, *ppp200* for example)
# - ROUTE1,
#     Route to add after connecting VPN (network/prefix)
# - ROUTE2 
#     Another route to add efter connecting VPN (network/prefix)
# 
# To install, go to **Control Panel > Task Scheduler**
# 
#   Hit **Create > Scheduled Task > User-defined Script**
#
#   ## General
#   - Task: **VPN keepalive**
#   - User: **root**
#  
#   ## Schedule 
#   - Run on the following days: **Daily**
#   - First run: **00:00**, 
#   - Frequency: **Every 5 min(s)**, 
#   - last run time: **23:55**
#   
#   ## Task settings
#   - Run command - User defined script: 
#     *paste this entire script's content*
# ---

CHECKIP='10.1.10.48'
NAME='Connexeon'
ID='p1489396766'
PROTO='pptp'
DEV='ppp200'
ROUTE1='10.0.0.0/12'
ROUTE2='10.111.0.0/24'

if ping -c 1 $CHECKIP &> /dev/null
then
  echo "VPN is running ($CHECKIP pingable)"
  synovpnc get_conn
  route
else
  echo "Reconnecting VPN ($CHECKIP unresponsive)"

  echo "Killing VPN ($NAME)"  
  synovpnc kill_client --name=$NAME
  
  echo "Reconnecting VPN ($NAME - $PROTO)"  

  echo conf_id=$ID > /usr/syno/etc/synovpnclient/vpnc_connecting
  echo conf_name=$NAME >> /usr/syno/etc/synovpnclient/vpnc_connecting
  echo proto=$PROTO >> /usr/syno/etc/synovpnclient/vpnc_connecting
  synovpnc reconnect --protocol=$PROTO --name=$NAME
  
  echo "Adding route ($ROUTE1 - $DEV)"  
  route add -net $ROUTE1 dev $DEV
  
  echo "Adding route ($ROUTE2 - $DEV)"  
  route add -net $ROUTE2 dev $DEV
fi
exit 0

Hello, where do i get the information for ROUTE1 & ROUTE2 ? Thank you.

Dear hannesbe,

How do I find out ROUTE1 and ROUTE2? Appreciate your response.

How do I find out ROUTE1 and ROUTE2? Appreciate your response.

These are your VPN subnets in CIDR notation. This example adds routes for 2 different VPN subnets. You may remove lines 46, 69 and 70 if you only have one VPN subnet.

Dear hannesbe,

Thank you and this helps.

Awesome :-) Just what I needed and should be in standard DSM!
Thanks for sharing!

You are the real MVP! Thank you <3

This is super awesome, ... has anyone tried this on DSM7 before I update?

This is super awesome, ... has anyone tried this on DSM7 before I update?

Yes, it is working!

Is it possible to integrate an email notification if the connection isnt working?

Thank you!

I also upgraded a DSM6 using this in the field to DSM7 and it kept on trucking

It worked for me like a charm! Thanks a lot!