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GRE_Tunnel.sh
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GRE_Tunnel.sh
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#!/bin/bash
read -r -p "Select server fot configuration? [A(local)/B(Wan)/N(none)]: " response
if [[ "$response" =~ ^([a]|[A])$ ]]
then
echo "Configuration Server A(as local):"
sudo modprobe ip_gre
lsmod | grep gre
sudo apt install iptables iproute2
sudo echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
sudo sysctl -p
read -p "Insert local ipaddress: " local
read -p "Insert remote ipaddress: " remote
sudo ip tunnel add gre1 mode gre local $local remote $remote ttl 255
sudo ip addr add 10.0.0.1/30 dev gre1
sudo ip link set gre1 up
#ping -c 6 10.0.0.2
sudo iptables -t nat -A POSTROUTING -s 10.0.0.0/30 ! -o gre+ -j SNAT --to-source $local
sudo iptables -A PREROUTING -d $local -p tcp -m tcp --dport 22 -j DNAT --to-destination $local:22
sudo iptables -A PREROUTING -d $local -p tcp -m tcp --dport 53 -j DNAT --to-destination $local
sudo iptables -A PREROUTING -d $local -p udp -m udp --dport 53 -j DNAT --to-destination $local
sudo iptables -A PREROUTING -d $local -j DNAT --to-destination $remote
sudo iptables -A POSTROUTING -j MASQUERADE
elif [[ "$response" =~ ^([bB])$ ]]
then
#[[ "$response" =~ ^([bB])$ ]]
echo "Configuration Server B(as Wan):"
sudo modprobe ip_gre
lsmod | grep gre
sudo apt install iptables iproute2
sudo echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
sudo sysctl -p
read -p "Insert local ipaddress: " local
read -p "Insert remote ipaddress: " remote
sudo ip tunnel add gre1 mode gre local $local remote $remote ttl 255
sudo ip addr add 10.0.0.2/30 dev gre1
sudo ip link set gre1 up
#ping -c 6 10.0.0.1
#iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
#sudo iptables -t nat -A POSTROUTING -s $local -j MASQUERADE
sudo iptables -A POSTROUTING -j MASQUERADE
else
[[ "$response" =~ ^([nN])$ ]]
exit
fi