#!/bin/bash # Function to prompt for input with a default value prompt_input() { local prompt=$1 local default=$2 read -p "$prompt [$default]: " input echo "${input:-$default}" } # Function to create bridge interface text for additional IP and internal bridges create_bridge_text() { local ip=$1 local bridge_id=$2 local mac_address=$3 local external_bridge_id=$bridge_id local internal_bridge_id=$((bridge_id * 100)) # WAN bridge configuration with MAC address and public IP local bridge_config=" auto vmbr${external_bridge_id} iface vmbr${external_bridge_id} inet static address ${ip} netmask ${NETMASK} bridge_ports none bridge_stp off bridge_fd 0 hwaddress ether ${mac_address} #WAN ${external_bridge_id} " # LAN bridge configuration without an IP, as it's for internal network only bridge_config+=" auto vmbr${internal_bridge_id} iface vmbr${internal_bridge_id} inet manual bridge_ports none bridge_stp off bridge_fd 0 #LAN ${internal_bridge_id} " echo "$bridge_config" } # Collect inputs MAINSERVERIP=$(prompt_input "MAIN_SERVER_IP" "192.168.0.1") GATEWAYADDRESS=$(prompt_input "MAIN_SERVER_GATEWAY_ADDRESS" "192.168.0.254") NETMASK=$(prompt_input "NETMASK" "255.255.255.0") BROADCASTIP=$(prompt_input "BROADCASTIP" "192.168.0.255") ADD_IP_ADDRESSES=$(prompt_input "ADDITIONAL_IP_ADDRESSES (comma-separated)" "") MAC_ADDRESSES=$(prompt_input "MAC_ADDRESSES for additional IPs (comma-separated)" "") NETWORK_INTERFACE=$(prompt_input "NETWORK_INTERFACE" "eth0") # Display inputs for confirmation echo "---------------------------------------------------------------------" echo "You have entered the following configuration:" echo "MAIN_SERVER_IP: $MAINSERVERIP" echo "MAIN_SERVER_GATEWAY_ADDRESS: $GATEWAYADDRESS" echo "NETMASK: $NETMASK" echo "BROADCASTIP: $BROADCASTIP" echo "ADDITIONAL_IP_ADDRESSES: $ADD_IP_ADDRESSES" echo "MAC_ADDRESSES: $MAC_ADDRESSES" echo "NETWORK_INTERFACE: $NETWORK_INTERFACE" echo "---------------------------------------------------------------------" read -p "Is this correct? [yes/no]: " confirmation if [[ $confirmation != [Yy]* ]]; then echo "Exiting without changes." exit fi # Split ADD_IP_ADDRESSES and MAC_ADDRESSES into arrays IFS=',' read -ra ADDR <<<"$ADD_IP_ADDRESSES" IFS=',' read -ra MACS <<<"$MAC_ADDRESSES" # Generate dynamic routing rules additional_routes="" for add_ip in "${ADDR[@]}"; do additional_routes+=" up ip route add $add_ip dev ${NETWORK_INTERFACE} " done # Initialize the interfaces file content interfaces_content=" ### Hetzner Online GmbH installimage source /etc/network/interfaces.d/* auto lo iface lo inet loopback iface lo inet6 loopback # Main network interface configuration iface ${NETWORK_INTERFACE} inet manual up ip route add -net ${GATEWAYADDRESS} netmask ${NETMASK} gw ${GATEWAYADDRESS} vmbr0 up sysctl -w net.ipv4.ip_forward=1 up sysctl -w net.ipv4.conf.${NETWORK_INTERFACE}.send_redirects=0 up sysctl -w net.ipv6.conf.all.forwarding=1 $additional_routes up ip route add 192.168.0.0/16 via ${MAINSERVERIP} dev vmbr0 up ip route add 172.16.0.0/12 via ${MAINSERVERIP} dev vmbr0 up ip route add 10.0.0.0/8 via ${MAINSERVERIP} dev vmbr0 auto vmbr0 iface vmbr0 inet static address ${MAINSERVERIP} netmask ${NETMASK} gateway ${GATEWAYADDRESS} broadcast ${BROADCASTIP} bridge-ports ${NETWORK_INTERFACE} bridge-stp off bridge-fd 0 pointopoint ${GATEWAYADDRESS} #Main IP configuration " # Append bridge interfaces for each additional IP and MAC address and create internal bridges for i in "${!ADDR[@]}"; do # Increment bridge_id for each additional IP bridge_id=$((i + 1)) interfaces_content+=$(create_bridge_text "${ADDR[i]}" "$bridge_id" "${MACS[i]}") done # Save the new configuration to a temporary file echo "$interfaces_content" > /tmp/new_interfaces # Display the current network configuration echo "---------------------------------------------------------------------" echo "Current network configuration (/etc/network/interfaces):" cat /etc/network/interfaces echo "" # Display the new network configuration echo "---------------------------------------------------------------------" echo "New network configuration:" cat /tmp/new_interfaces echo "" # Show the differences echo "---------------------------------------------------------------------" echo "Configuration differences:" diff /etc/network/interfaces /tmp/new_interfaces echo "" # Confirm before applying changes echo "---------------------------------------------------------------------" read -p "Apply this network configuration? [yes/no]: " apply_conf if [[ $apply_conf == [Yy]* ]]; then timestamp=$(date +%Y%m%d-%H%M%S) mv /etc/network/interfaces /etc/network/interfaces.bak-$timestamp mv /tmp/new_interfaces /etc/network/interfaces echo "The network can be restarted with the following command: '/etc/init.d/networking' restart or 'systemctl restart networking'" else echo "Exiting without applying changes." rm /tmp/new_interfaces fi