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002-Tinc_VPN.md

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Tinc VPN - Virtual LAN

Software for mesh connections, used to create a virtual LAN.
Set the hostname and the internal IP address correctly (see the introduction.)

These document is for "normal" servers.

Procedure

apt install tinc

mkdir -p /etc/tinc/scambi/hosts
cd /etc/tinc

nano nets.boot

scambi

nano scambi/tinc.conf

(HOST_NAME must be substituted with the host name)

Name=HOST_NAME
Device=/dev/net/tun
AddressFamily=ipv4
Mode=switch
Port=777

Cipher=aes-256-cbc
Digest=SHA512

ConnectTo=pila1see
ConnectTo=pila2sca

nano scambi/tinc-up

#!/bin/sh
ip link set $INTERFACE up
ip addr add 192.168.64.X/24 dev $INTERFACE

nano scambi/tinc-down

#!/bin/sh
ip addr del 192.168.64.X/24 dev $INTERFACE
ip link set $INTERFACE down

chmod +x scambi/tinc-*

tincd -n scambi -K 4096

nano scambi/hosts/”nome host”

Subnet = 192.168.64.X/32
Port = 777

copy scambi/hosts/HOST_NAME on pila1see
copy scambi/hosts/pila1see on this host

nano scambi/hosts/pila1see-up

#!/bin/sh
ip route add 192.168.64.1 dev $INTERFACE
ip route add 192.168.66.0/24 via 192.168.64.1 dev $INTERFACE

nano scambi/hosts/pila1see-down

#!/bin/sh
ip route del 192.168.66.0/24 via 192.168.64.1 dev $INTERFACE
ip route del 192.68.64.1 dev $INTERFACE

chmod +x scambi/hosts/pila1see-*

copy scambi/hosts/HOST_NAME on pila2csa
copy scambi/hosts/pila2sca on this host

nano scambi/hosts/pila2sca-up

#!/bin/sh
ip route add 192.168.64.2 dev $INTERFACE
ip route add 192.168.68.0/24 via 192.168.64.2 dev $INTERFACE

nano scambi/hosts/pila2sca-down

#!/bin/sh
ip route del 192.168.68.0/24 via 192.168.64.2 dev $INTERFACE
ip route del 192.168.64.2 dev $INTERFACE

chmod +x scambi/hosts/pila2sca-*

Enable and start

Enable and start the service:

systemctl enable tinc
mkdir /etc/systemd/system/[email protected]
nano /etc/systemd/system/[email protected]/after.conf

[Unit]
After=network.target

systemctl enable --now tinc@scambi

add DNS records on pila1see

Tricks

to have the list of nodes, so we can read it with the command journalctl -u tinc@scambi

kill -s USR2 “tinc process PID”

purge deleted nodes

tincd -n scambi -kWINCH