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NOTICE to the Moderator: PLEASE MOVE TO THE RIGHT FORUM Hello, I want to make a thread about split tunneling through a spezific user. I figured out how it works and want to share it. I use Debian 8/9 but it should work with other distros too. Openvpn Split tunnel though user Debian 8 & 9 based Install openvpn from apt or install it via source apt-get update -y && apt-get upgrade -y && apt-get install openvpn htop nload dstat sudo apt-utils iptables curl resolvconf -y nano /etc/systemd/system/openvpn@openvpn.service Config: [Unit] Description=OpenVPN connection to %i Documentation=man:openvpn(8) Documentation=https://community.openvpn.net/openvpn/wiki/Openvpn23ManPage Documentation=https://community.openvpn.net/openvpn/wiki/HOWTO After=network.target [Service] RuntimeDirectory=openvpn PrivateTmp=true KillMode=mixed Type=forking ExecStart=/usr/sbin/openvpn --daemon ovpn-%i --status /run/openvpn/%i.status 10 --cd /etc/openvpn --script-security 2 --config /etc/openvpn/%i.conf --writepid /run/openvpn/%i.pid PIDFile=/run/openvpn/%i.pid ExecReload=/bin/kill -HUP $MAINPID WorkingDirectory=/etc/openvpn Restart=on-failure RestartSec=3 ProtectSystem=yes LimitNPROC=10 DeviceAllow=/dev/null rw DeviceAllow=/dev/net/tun rw [Install] WantedBy=multi-user.target Enable Service systemctl enable openvpn@openvpn.service Download Airvpn/Openvpn config and paste it in there: nano /etc/openvpn/openvpn.conf Add this to the config: nobind script-security 2 route-noexec up /etc/openvpn/iptables.sh down /etc/openvpn/update-resolv-conf Change DNS nano /etc/openvpn/update-resolv-conf foreign_option_1='dhcp-option DNS AIRVPN DNS1' foreign_option_2='dhcp-option DNS AIRVPN DNS2' foreign_option_3='dhcp-option DNS 1.1.1.1' Add user and group adduser --disabled-login vpn usermod -aG vpn XXX usermod -aG XXX vpn Iptables Flush & Rules iptables -F iptables -A OUTPUT ! -o lo -m owner --uid-owner vpn -j DROP apt-get install iptables-persistent -y nano /etc/openvpn/iptables.sh Change INTERFACE, VPNUSER, LOCALIP and NETIF Script: #! /bin/bash export INTERFACE="tun0" export VPNUSER="vpn" export LOCALIP="192.168.1.130" export NETIF="eth0" # flushes all the iptables rules, if you have other rules to use then add them into the script iptables -F -t nat iptables -F -t mangle iptables -F -t filter # mark packets from $VPNUSER iptables -t mangle -A OUTPUT -j CONNMARK --restore-mark iptables -t mangle -A OUTPUT ! --dest $LOCALIP -m owner --uid-owner $VPNUSER -j MARK --set-mark 0x1 iptables -t mangle -A OUTPUT --dest $LOCALIP -p udp --dport 53 -m owner --uid-owner $VPNUSER -j MARK --set-mark 0x1 iptables -t mangle -A OUTPUT --dest $LOCALIP -p tcp --dport 53 -m owner --uid-owner $VPNUSER -j MARK --set-mark 0x1 iptables -t mangle -A OUTPUT ! --src $LOCALIP -j MARK --set-mark 0x1 iptables -t mangle -A OUTPUT -j CONNMARK --save-mark # allow responses iptables -A INPUT -i $INTERFACE -m conntrack --ctstate ESTABLISHED -j ACCEPT # block everything incoming on $INTERFACE to prevent accidental exposing of ports iptables -A INPUT -i $INTERFACE -j REJECT # let $VPNUSER access lo and $INTERFACE iptables -A OUTPUT -o lo -m owner --uid-owner $VPNUSER -j ACCEPT iptables -A OUTPUT -o $INTERFACE -m owner --uid-owner $VPNUSER -j ACCEPT # all packets on $INTERFACE needs to be masqueraded iptables -t nat -A POSTROUTING -o $INTERFACE -j MASQUERADE # reject connections from predator IP going over $NETIF iptables -A OUTPUT ! --src $LOCALIP -o $NETIF -j REJECT # Start routing script /etc/openvpn/routing.sh exit 0 chmod +x /etc/openvpn/iptables.sh nano /etc/openvpn/routing.sh Change ifconfig to ip if your OS dont support ifconfig anymore or install it. apt install net-tools Change VPNIG and VPNUSER if needed Script: #! /bin/bash VPNIF="tun0" VPNUSER="vpn" GATEWAYIP=`ifconfig $VPNIF | egrep -o '([0-9]{1,3}\.){3}[0-9]{1,3}' | egrep -v '255|(127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3})' | tail -n1` if [[ `ip rule list | grep -c 0x1` == 0 ]]; then ip rule add from all fwmark 0x1 lookup $VPNUSER fi ip route replace default via $GATEWAYIP table $VPNUSER ip route append default via 127.0.0.1 dev lo table $VPNUSER ip route flush cache # run update-resolv-conf script to set VPN DNS /etc/openvpn/update-resolv-conf exit 0 chmod +x /etc/openvpn/routing.sh nano /etc/iproute2/rt_tables Add 200 vpn Edit vpn filter nano /etc/sysctl.d/9999-vpn.conf Add: Replace XXXXXX with your eth/wireless interface net.ipv4.conf.all.rp_filter = 2 net.ipv4.conf.default.rp_filter = 2 net.ipv4.conf.XXXXXX.rp_filter = 2 net.ipv6.conf.all.rp_filter = 2 net.ipv6.conf.default.rp_filter = 2 net.ipv6.conf.XXXXXX.rp_filter = 2 Apply Rules and show status sysctl --system service openvpn status Test it IP: sudo -u vpn -i -- curl ipinfo.io DNS: sudo -u vpn -i -- cat /etc/resolv.conf Enjoy

Thanks you for your exellent improvements. I'll add it these weeks and release it with an autoinstaller script. I personally disable ipv6 but some users might need it. If you have other nice improvements let me know and we can talk and change it. Kindly Regards, ucode

Oh my god, patience! What the hell is wrong with some people nowadays? Everyone expects shit being done the moment they say they need it. Read Staff's post again... carefully.

Looks like I'm not the only one to "misread". My friends, this applies to *web* servers.

Hello! Pinning this and marking giganerds answer as the "solution" for convenience, as it's important we make as many people as possible aware of the issue of running exit nodes in this fashion. Further interesting and clarifying messages include: From giganerd: One of a few Staff posts: Hopefully that'll help make more people aware of the issue. Locking for now, as I believe most of what could be said, has been said already.

Website: Swisscom TV Switzerland streaming television from Swisscom, Live and On Demand. Status: OK Native: CH servers. Routing: All other servers.

Hello! We're very glad to inform you that TLS 1.3 is now supported on all AirVPN web servers. Why TLS 1.3 is better than 1.2: https://en.wikipedia.org/wiki/Transport_Layer_Security#TLS_1.3 TLS 1.0, 1.1 and 1.2 will still be available for backward compatibility. Kind regards and datalove AirVPN Staff

https://netflix.com Watch Movies & TV Shows Online or Streaming right to your TV via Xbox, Wii, PS3 & many other devices. Only $7.99/mo. Status: NOT ACCESSIBLE Native: none. Routing: All servers Last update: February the 1st, 2020

I just started tinkering with VPN on my Synology as well. I have set it up succesfully using the above guide. But I have some connections that need to go around the VPN as well (mainly SSL connections to usenet servers). I have created a passthrough by adding static routes to the routing table in the Synology configuration that explicitly go to the specific usenet server (ranges). This seems to work quite well, but of course is not useful if the IP address of the destination servers do change.

Website: Teleboy TV Switzerland streaming television, Live and On Demand. Status: OK Native: CH servers. Routing: All other servers.

Website: http://www.ardmediathek.de/tv/Das-Erste/live?kanal=208 German TV channel Das Erste. Status: OK Native: NO Routing: All servers.

Website: http://www.leonardo.tv/ Italian TV Streaming Status: OK Routing: All servers to IT route.