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Hello all, This is collection from different tutorials which I will refer here, but usually changed since some things changed. Setting up VPN on Synology is modified neolefort tutorial from here and reconnect script if from sundi which you can find here, which probably modified this script, plus my iptables for blocking Synology on router level when VPN fails. Other contributions: foobar666 - you no longer need to enter variables manually _sinnerman_ - fixed script for DS 6.1 I'm doing this mostly because I usually forget things I managed to solve after year or two, so this is way to have constant reminder how it was solved and also help others. 1. Get your certificates from AirVPN. Go to the https://airvpn.org/generator/ page to generate the configuration file. (1) SELECT the Advanced Mode (under "Config generator" title ) (2) SELECT LINUX OS (3) Under "Protocols" section select one with protocol UDP, port 443 and tls-auth in the right column (at the time of writing, it was in middle of the list). You can choose any combination of protocol/port, but then also change iptables accordingly if you are using failsafe script. Don't choose any combination which has tls-crypt in the right column. (4) Under "Advanced - OpenVPN only" section (right part of page), toggle "Separate keys/certs from .ovpn file" button and change/leave OpenVPN version to 2.5 (This works in DSM 7.2.1. For older versions you will maybe have to select OpenVPN version 2.4). (5) SELECT 1 SERVER (refer to section "by single servers") OR COUNTRY OR ANYTHING ELSE YOU WANT In original tutorial, neolefort said to choose 1 server, because in that case you will get IP instead of xxx.airvpn.org domain. Choosing 1 server is safe because it doesn't need working DNS when you want to connect to VPN. If you choose anything else, you need working DNS on your router when establishing VPN connection. (6) Click "GENERATE" at the bottom. (7) Page will reload with links on top to your files, save them to you computer. Following files will be generated: -AirVPN_XXXXX_UDP-443.ovpn -ca.crt -user.crt -user.key -ta.key 2. Setup AirVPN on Synology. - Login as admin or with user from Administrator group. - Open Control panel. - Go "Network" and click on tab "Network Interface" - Click on button "Create" - "Create VPN profile" - Choose "OpenVPN (via importing .ovpn file)" - Click "Advanced options" so it shows all options - Profile name: anything you want, but please keep is short and if you can without spaces " ", for example "AirVPN". - User name: LEAVE EMPTY (for DSM 7+ just put anything here) - Password: LEAVE EMPTY (for DSM 7+ just put anything here) - Import .ovpn file: click button and import your AirVPN_XXXXX_UDP-443.ovpn - CA certificate: click button and import your ca.crt - Client certificate: click button and import your user.crt - Client key: click button and import your user.key - Certificate revocation: LEAVE EMPTY - TLS-auth key: click button and import your ta.key - Click "Next" - Select all options and click "Done" Now you have working OpenVPN link on your Synology. You just need to start it from "Control panel" - "Network" - "Network Interface". If you want to make your connection faster, you can remove some ciphers. Look for this line in .ovpn file: data-ciphers AES-256-GCM:AES-256-CBC:AES-192-GCM:AES-192-CBC:AES-128-GCM:AES-128-CBC And change it to this: data-ciphers AES-128-GCM Then save file and create new connection with it. After some testing I found out AES-128-GCM is fastest from all other mentioned in settings. You can also test other ciphers your self and leave one you find fastest. EXTRAS!!! 3. Setting up external access to your Synology. First what you will notice is, "I CAN'T ACCESS MY SYNOLOGY FROM OUTSIDE OF MY LAN!!!!!!! OMG OMG OMG!!!!" I will not explain port fowards on your router here, if you don't know how to make one, learn! (1) You can port forward trough AirVPN webpage and access your Syno via VPN exit IP. This sometimes works, most of times it doesn't since Syno has some ports you cannot change. Anyway, change your default HTTP / HTTPS port on Syno to your forwarded AirVPN port and you should be fine. But forget about Cloudstation and similliar things. (2) If you want to access Syno via you ISP IP (WAN), then problem is, your Syno is receiving your connection, but it's replying trough VPN. That's a security risk and those connections get droped. But there is solution! - Access "Control panel" - "Network" - "General" - Click "Advanced Settings" button - Mark "Enable multiple gateways" and click "OK" and then "Apply" You're done! It's working now (if you forwarded good ports on your router). 4. Prevent leaks when VPN connection on Synology fails. There will be time, when you VPN will fail, drop, disconnect, and your ISP IP will become visible to world. This is one of ways you can prevent it, on router level. For this you need Tomato, Merlin, DD-WRT or OpenWRT firmware on your router. I will tell you steps for Tomato router. If you are using different firmware, then you need to learn alone how to input this code into your router. Since Shibby version 129 for ARM routers, syntax of iptables changed and depending on which version of iptables you are using, apply that code. - Login to your router (usually just by entering 192.168.1.1 into your browser, if your IP is different, find out which is your gateway IP). - Click on "Administration" - Click on "Scripts" - Choose tab "Firewall" For Shibby v129 for ARM and later (iptables 1.4.x) us this: #Use this order of commands because it executes in reverse order. #This command will execute last, it kills all UDP requests. iptables -I FORWARD -p udp -s 192.168.1.100 -j REJECT #This command will execute second and will block all TCP source ports except those needed for web access or services iptables -I FORWARD -p tcp -s 192.168.1.100 -m multiport ! --sports 5000,5001,6690 -j REJECT #This command will execute first and will ACCEPT connection to your VPN on destination port 443 UDP iptables -I FORWARD -p udp -s 192.168.1.100 -m multiport --dports 443 -j ACCEPT For earlier Shibby versions and later for MIPS routers: #Use this order of commands because it executes in reverse order. #This command will execute last, it kills all UDP requests. iptables -I FORWARD -p udp -s 192.168.1.100 -j REJECT #This command will execute second and will block all TCP source ports except those needed for web access or services iptables -I FORWARD -p tcp -s 192.168.1.100 -m multiport --sports ! 5000,5001,6690 -j REJECT #This command will execute first and will ACCEPT connection to your VPN on destination port 443 UDP iptables -I FORWARD -p udp -s 192.168.1.100 -m multiport --dports 443 -j ACCEPT Port TCP 5000 = HTTP for for Synology web access (change to your if it's not default) Port TCP 5001 = HTTPS for for Synology web access (change to your it's not default) Port TCP 6690 = Cloud Station port Port UDP 443 = AirVPN connection port which you defined in step 1 of this tutorial. If you are using TCP port, then you need to change "-p udp" to "-p tcp" in that line. If you need more ports, just add them separated by comma ",". If you want port range, for example 123,124,125,126,127, you can add it like this 123:127. Change IP 192.168.1.100 to your Synology LAN IP. Be careful NOT TO assign those ports to your Download Station on Synology. This isn't perfect, you can still leak your IP through UDP 443, but since torrent uses mostly TCP, those chances are minimal. If you use TCP port for VPN, then those chances increase. If you really want to be sure nothing leaks even on UDP 443 (or your custom port), you need to choose 1 (ONE) AirVPN server. You need to find that server entry IP and change last IPTABLES rule to something like this: iptables -I FORWARD -p udp -s 192.168.1.100 -d 123.456.789.123 -m multiport --dports 443 -j ACCEPT Where 123.456.789.123 is AirVPN server entry IP. This will allow UDP 443 only for that server, rest will be rejected by router. These are all my opinions, from my very limited knowledge, which may be right and may be wrong. 5. Auto reconnection when VPN is down. Since when you made your VPN connection on your Synology, you checked "Reconnect" option, Syno will try to reconnect automaticly when connection fails. But in some cases, your network will be offline long enough and Syno will stop trying to reconnect, or will hang with VPN connection established, but not working. In those cases you can use this auto reconnect script. This is reconnect script. Just select all script text and copy it. #VPN Check script modified Sep 11, 2016 #Script checks if VPN is up, and if it is, it checks if it's working or not. It provides details like VPN is up since, data #received/sent, VPN IP & WAN IP. #If VPN is not up it will report it in the log file and start it #Change LogFile path to your own location. #Save this script to file of your choosing (for example "synovpn_reconnect"). Store it in one of your Synology shared folders and chmod it: "chmod +x /volume1/shared_folder_name/your_path/synovpn_reconnect" #Edit "/etc/crontab" and add this line without quotes for starting script every 10 minutes: "*/10 * * * * root /volume1/shared_folder_name/your_path/synovpn_reconnect" #After that restart cron with: "/usr/syno/sbin/synoservicectl --restart crond" #!/bin/sh DATE=$(date +"%F") TIME=$(date +"%T") VPNID=$(grep "\[.*\]" /usr/syno/etc/synovpnclient/openvpn/ovpnclient.conf | cut -f 2 -d "[" | cut -f 1 -d "]") VPNNAME=$(grep conf_name /usr/syno/etc/synovpnclient/openvpn/ovpnclient.conf | cut -f 2 -d "=") LogFile="/volume1/filmovi/Backup/airvpn/check_airvpn_$DATE.log" PUBIP=$(curl -s -m 5 icanhazip.com) #PUBIP=$(curl -s -m 5 ipinfo.io/ip) #PUBIP=$(curl -s -m 5 ifconfig.me) CHECKIP=$(echo $PUBIP | grep -c ".") start_vpn() { echo "VPN is down. Attempting to (re)start now." >> $LogFile # /usr/syno/bin/synovpnc kill_client --protocol=openvpn --name=$VPNNAME /usr/syno/bin/synovpnc kill_client /bin/kill `cat /var/run/ovpn_client.pid` 2>/dev/null sleep 35 echo 1 > /usr/syno/etc/synovpnclient/vpnc_connecting echo conf_id=$VPNID > /usr/syno/etc/synovpnclient/vpnc_connecting echo conf_name=$VPNNAME >> /usr/syno/etc/synovpnclient/vpnc_connecting echo proto=openvpn >> /usr/syno/etc/synovpnclient/vpnc_connecting /usr/syno/bin/synovpnc reconnect --protocol=openvpn --name=$VPNNAME >> $LogFile } sleep 6 echo "======================================" >> $LogFile echo "$DATE $TIME" >> $LogFile if ifconfig tun0 | grep -q "00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00" then if [ "$CHECKIP" == 1 ] then IPADDR=$(/sbin/ifconfig tun0 | grep 'inet addr' | cut -d: -f2 | awk '{print $1}') RXDATA=$(/sbin/ifconfig tun0 | grep "bytes:" | cut -d: -f2 | awk '{print $1,$2,$3}') TXDATA=$(/sbin/ifconfig tun0 | grep "bytes:" | cut -d: -f3 | awk '{print $1,$2,$3}') UPTIME=$(cat /var/log/messages | grep "$IPADDR" | awk '{print $1}' | tail -1) UPTIME=$(date -d"$UPTIME" +"%Y/%m/%d %H:%M:%S") echo "VPN is up since: $UPTIME" >> $LogFile echo "Session Data RX: $RXDATA" >> $LogFile echo "Session Data TX: $TXDATA" >> $LogFile echo "VPN IP is: $IPADDR" >> $LogFile echo "WAN IP is: $PUBIP" >> $LogFile else start_vpn fi else start_vpn fi exit 0 (1) Login to you Synology DSM web interface as admin. - As admin go to "Control panel" - "Task Scheduler" (you need to enable advanced mode in top right corner of control panel for this) - Click "Create" button near top of page, then select "Scheduled Task" and then "User-defined script" (2) New popup window will open. - under "Task:" enter task name - under "User:" select "root" if it's not already selected - switch to "Schedule" tab and select how often you want this task to run, my settings are: - "Run of following days" - "Daily" - "First run time" - 00:00 - "Frequency" - "Every 10 minutes" - "Last run time" - 23:50 - switch to "Task settings" tab - paste script you copied into empty box under "User-defined script" title - press OK and you're done I tested this on DSM 6.2.2 and it works without problems for now. Still, I'm keeping old instructions in next post, if someone wants to do it like that. Tip: If you don't want logfile, you can comment out those lines, or remove ">> $LogFile" code from whole script. That's all. If you entered everything correctly, you should be fine and ready to go! Comments are welcome. If you find mistakes, please correct me.

This is just part of old tutorial. It still works same as new tutorial above, I just wanted to simplify it to people so they don't have to use Putty, vi, edit crontab etc. 5. Auto reconnection when VPN is down. Since when you made your VPN connection on your Synology, you checked "Reconnect" option, Syno will try to reconnect automaticly when connection fails. But in some cases, your network will be offline long enough and Syno will stop trying to reconnect, or will hang with VPN connection established, but not working. In those cases you can use this auto reconnect script. This is reconnect script. Save it in file named whatever you want. I'm using file name "synovpn_reconnect". All instructions how to use it are inside script in comments, but I will repeat them in this post also. #VPN Check script modified Sep 11, 2016 #Script checks if VPN is up, and if it is, it checks if it's working or not. It provides details like VPN is up since, data #received/sent, VPN IP & WAN IP. #If VPN is not up it will report it in the log file and start it #Change LogFile path to your own location. #Save this script to file of your choosing (for example "synovpn_reconnect"). Store it in one of your Synology shared folders and chmod it: "chmod +x /volume1/shared_folder_name/your_path/synovpn_reconnect" #Edit "/etc/crontab" and add this line without quotes for starting script every 10 minutes: "*/10 * * * * root /volume1/shared_folder_name/your_path/synovpn_reconnect" #After that restart cron with: "/usr/syno/sbin/synoservicectl --restart crond" #!/bin/sh DATE=$(date +"%F") TIME=$(date +"%T") VPNID=$(grep "\[.*\]" /usr/syno/etc/synovpnclient/openvpn/ovpnclient.conf | cut -f 2 -d "[" | cut -f 1 -d "]") VPNNAME=$(grep conf_name /usr/syno/etc/synovpnclient/openvpn/ovpnclient.conf | cut -f 2 -d "=") LogFile="/volume1/filmovi/Backup/airvpn/check_airvpn_$DATE.log" PUBIP=$(curl -s -m 5 icanhazip.com) #PUBIP=$(curl -s -m 5 ipinfo.io/ip) #PUBIP=$(curl -s -m 5 ifconfig.me) CHECKIP=$(echo $PUBIP | grep -c ".") start_vpn() { echo "VPN is down. Attempting to (re)start now." >> $LogFile # /usr/syno/bin/synovpnc kill_client --protocol=openvpn --name=$VPNNAME /usr/syno/bin/synovpnc kill_client /bin/kill `cat /var/run/ovpn_client.pid` 2>/dev/null sleep 35 echo 1 > /usr/syno/etc/synovpnclient/vpnc_connecting echo conf_id=$VPNID > /usr/syno/etc/synovpnclient/vpnc_connecting echo conf_name=$VPNNAME >> /usr/syno/etc/synovpnclient/vpnc_connecting echo proto=openvpn >> /usr/syno/etc/synovpnclient/vpnc_connecting /usr/syno/bin/synovpnc reconnect --protocol=openvpn --name=$VPNNAME >> $LogFile } sleep 6 echo "======================================" >> $LogFile echo "$DATE $TIME" >> $LogFile if ifconfig tun0 | grep -q "00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00" then if [ "$CHECKIP" == 1 ] then IPADDR=$(/sbin/ifconfig tun0 | grep 'inet addr' | cut -d: -f2 | awk '{print $1}') RXDATA=$(/sbin/ifconfig tun0 | grep "bytes:" | cut -d: -f2 | awk '{print $1,$2,$3}') TXDATA=$(/sbin/ifconfig tun0 | grep "bytes:" | cut -d: -f3 | awk '{print $1,$2,$3}') UPTIME=$(cat /var/log/messages | grep "$IPADDR" | awk '{print $1}' | tail -1) UPTIME=$(date -d"$UPTIME" +"%Y/%m/%d %H:%M:%S") echo "VPN is up since: $UPTIME" >> $LogFile echo "Session Data RX: $RXDATA" >> $LogFile echo "Session Data TX: $TXDATA" >> $LogFile echo "VPN IP is: $IPADDR" >> $LogFile echo "WAN IP is: $PUBIP" >> $LogFile else start_vpn fi else start_vpn fi exit 0 (1) Enable SSH on your Synology if you didn't already. - As admin go to "Control panel" - "Terminal & SNMP" (you need to enable advanced mode in top right corner of control panel for this) - Check "Enable SSH service" - Click "Apply" (2) Save script above in file "synovpn_reconnect". Make sure to save it in UNIX UTF8, not windows. You can do that on windows with Notepad++, just open file with Notepad++, click "Encoding" - "Convert to UTF-8 without BOM" and them save file. (3) Edit script variables so it works for your system. You only need to edit this part: LogFile="/volume1/video/Backup/airvpn/check_airvpn_$DATE.log" Thanks to foobar666, you no longer need to enter VPNID or VPNNAME, it will detect them automatically. Now you only need to change your LogFile variable to match your wishes. After you finish editing script, save it. (4) Move or copy "synovpn_reconnect" to your Synology shared drive. Doesn't matter which, just be sure to know full path to it. If you only have 1 volume/drive, with multiple shared folders, your path should look similar to this: /volume1/shared_folder_name/your_path/ So for example, if you keep your files in default CloudStation folder, your path should look something like this: /volume1/home/your_username/CloudStation/ You can also do all this with VI, check original tutorial for that. (5) Now use Putty if you are on windows, or your terminal on linux, to access your Synology via SSH. I will not tutor you how to do that, learn. admin@192.168.1.100 or username@192.168.1.100 + password, or whatever your Syno LAN IP is. (6) Now type this into Putty/terminal: sudo chmod +x /volume1/shared_folder_name/your_path/synovpn_reconnect You need to chmod it to be executable. You will notice I use "sudo". It's because my admin username isn't default "admin". If you are using default "admin" user, then you probably don't need sudo. (7) Setup cron so it automatically starts your script every X minutes / hours / days. To setup it enter this: vi /etc/crontab And then press "i" to enter editing mode. Go to last line, and start new line with this: */10 * * * * root /volume1/shared_folder_name/your_path/synovpn_reconnect Note that those ARE NOT spaces, those are TABS. This will start your script every 10 minutes. Change to whatever you want. Then press ESC key, and then type: :wq To exit VI and save file. After that type: /usr/syno/sbin/synoservicectl --restart crond To restart cron (or restart your Synology). Tip: If you don't want logfile, you can comment out those lines, or remove ">> $LogFile" code from whole script.