SynoOpenVpnStaticIp

This script sets up static client IPs when using OpenVPN of VPN Server package.

1. Notes

• Pass the client list like this: "<username>:<ipsuffix>" (e. g. "john:202" will make sure that user john will be assigned IP 10.8.0.202)
• Please follow Synology/OpenVPN convention and only assign even numbers greater than: 2 + 4 * <max-clients>
• Use IP-suffixes great enough in order not to conflict with the build in dynamic assignment
• The script is able to automatically update itself using git.

2. Installation

2.1 Install Git (optional)

• install the package Git Server on your Synology NAS, make sure it is running (requires sometimes extra action in Package Center and SSH running)
• alternatively add SynoCommunity to Package Center and install the Git package (https://synocommunity.com/)
• you can also use entware-ng (https://github.com/Entware/Entware-ng)

2.2 Install this script (using git)

• create a shared folder e. g. sysadmin (you want to restrict access to administrators and hide it in the network)
• connect via ssh to the NAS and execute the following commands

# navigate to the shared folder
cd /volume1/sysadmin
# clone the following repo
git clone https://github.com/alexanderharm/syno-openvpn-static-ip
# to enable autoupdate
touch syno-openvpn-static-ip/autoupdate

2.3 Install this script (manually)

• create a shared folder e. g. sysadmin (you want to restrict access to administrators and hide it in the network)
• copy your synoOpenVpnStaticIp.sh to sysadmin using e. g. File Station or scp
• make the script executable by connecting via ssh to the NAS and executing the following command

chmod 755 /volume1/syno-openvpn-static-ip/synoOpenVpnStaticIp.sh

3. Setup

• run script manually (as root)

/volume1/sysadmin/syno-openvpn-static-ip/synoOpenVpnStaticIp.sh "<username1>:<ipsuffix1>" "<username2>:<ipsuffix2>"

AND/OR

• create a task in the Task Scheduler via WebGUI

# Type
Scheduled task > User-defined script

# General
Task:    SynoOpenVpnStaticIp
User:    root
Enabled: yes

# Schedule
Run on the following days: Daily
First run time:            00:00
Frequency:                 Every 1 hour(s)
Last run time:			   23:00

# Task Settings
User-defined script: /volume1/sysadmin/syno-openvpn-static-ip/synoOpenVpnStaticIp.sh "<username1>:<ipsuffix1>" "<username2>:<ipsuffix2>"

4. Example

/volume1/sysadmin/syno-openvpn-static-ip/synoOpenVpnStaticIp.sh "extbackup:202"