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Old 07-02-2017
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Default VPN L2TP/IPsec VPN Kill Switch for Linux using UFW Firewall

From what I can tell so far this application works 100% con is having to disable/enable firewall every time VPN drops. If someone with 1st hand experience with Linux UFW firewall can tell me if I'm missing any thing I would appreciate it.

L2TP/IPsec VPN Kill Switch for Linux Ubuntu with UFW firewall.

1. Need IP of VPN Server = 100.000.00.000
2. Need to find port of VPN Server = TCP 443 (port @ top of list for TCP protocol)
3. Connect to VPN
4. Find what interface VPN uses ( tun0 or ppp0 ) by running cmd:

ifconfig

5. Find IP address of local network (Should look like 100.0.0.1/8) by running cmd :

ip addr show

6. Set up UFW firewall

sudo apt-get install ufw

sudo ufw enable

sudo ufw default deny outgoing

sudo ufw default deny incoming


You can test connection is blocked by pinging google server. Run cmd:

ping 8.8.8.8

Ctrl+c to kill cmd

sudo ufw allow out to 100.0.0.1/8

sudo ufw allow in to 100.0.0.1/8

sudo ufw allow out to 100.000.00.000 port 443 tcp

sudo ufw allow out on ppp0


To check the status of the firewall ( will not show default policies ) run cmd:

sudo ufw status numbered


7. Block all ipv6 by by deleting the rule number for ipv6 ( #5 )

sudo ufw delete 5

To check rule is deleted run cmd:

sudo ufw status numbered


When you lose VPN connection you must run cmd: “sudo ufw disable” to connect back to VPN:

sudo ufw disable

Once connected back to the VPN run cmd: “sudo ufw enable" to turn firewall killswitch back on.

sudo ufw enable


These cmds have been modified to work with SoftEther L2TP/IPsec form original source:
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