GRE Tunnel Config Generator Online-Tool

#!/usr/bin/env bash
# Linux Point-to-Point GRE Tunnel Setup
set -euo pipefail

# 1. Create GRE tunnel interface
sudo ip tunnel add gre01 mode gre remote 203.0.113.1 local 198.51.100.1 ttl 255

# 2. Assign tunnel IP address
sudo ip addr add 10.0.0.1/30 dev gre01

# 3. Adjust MTU to accommodate 24-byte GRE encapsulation overhead
sudo ip link set gre01 mtu 1476

# 4. Bring up tunnel interface
sudo ip link set gre01 up

echo "GRE Tunnel gre01 successfully established!"
ip addr show gre01