#!/bin/bash

# installs on deb13 
printf "\nWhat ip range do you want to route?"
printf "\nformat: 172.168.1.0/24"
read ip_range

# installs
apt update
apt install networkd-dispatcher 

systemctl enable networkd-dispatcher
systemctl start networkd-dispatcher

# tcp forwarding
echo 'net.ipv4.ip_forward = 1' | tee -a /etc/sysctl.d/99-tailscale.conf
echo 'net.ipv6.conf.all.forwarding = 1' |  tee -a /etc/sysctl.d/99-tailscale.conf
sysctl -p /etc/sysctl.d/99-tailscale.conf

# udp forwarding
printf '#!/bin/sh\n\nethtool -K %s rx-udp-gro-forwarding on rx-gro-list off \n' "$(ip -o route get 8.8.8.8 | cut -f 5 -d " ")" | tee /etc/networkd-dispatcher/routable.d/50-tailscale
chmod 755 /etc/networkd-dispatcher/routable.d/50-tailscale

# tailscale curl script
curl -fsSL https://tailscale.com/install.sh | sh

# log in and up
tailscale up --advertise-routes $ip_range --advertise-exit-node