Code: #!/usr/bin/env bash # This is a service to forward traffic from WiFi to Ethernet # This script works on Debian 12 # First You need to manually setup your WIFI password # Make sure your LAN device is named correctly # This script uses enp0s25 as the ethernet device name set -e [ $EUID -ne 0 ] && echo "run as root" >&2 && exit 1 # parprouted - Proxy ARP IP bridging daemon # dhcp-helper - DHCP/BOOTP relay agent apt update && apt install -y dhcpcd dhcpcd5 dhcp-helper parprouted systemctl stop dhcp-helper systemctl enable dhcp-helper # Enable ipv4 forwarding. sed -i'' s/#net.ipv4.ip_forward=1/net.ipv4.ip_forward=1/ /etc/sysctl.conf # Service configuration for standard WiFi connection. Connectivity will # be lost if the username and password are incorrect. systemctl restart wpa_supplicant.service # Enable IP forwarding for wlan0 if it's not already enabled. grep '^option ip-forwarding 1$' /etc/dhcpcd.conf || printf "option ip-forwarding 1\n" >> /etc/dhcpcd.conf # Disable dhcpcd control of ethernet. grep '^denyinterfaces eth0$' /etc/dhcpcd.conf || printf "denyinterfaces eth0\n" >> /etc/dhcpcd.conf # Configure dhcp-helper. cat > /etc/default/dhcp-helper <<EOF DHCPHELPER_OPTS="-b wlan0" EOF # Enable avahi reflector if it's not already enabled. sed -i'' 's/#enable-reflector=no/enable-reflector=yes/' /etc/avahi/avahi-daemon.conf grep '^enable-reflector=yes$' /etc/avahi/avahi-daemon.conf || { printf "something went wrong...\n\n" printf "Manually set 'enable-reflector=yes in /etc/avahi/avahi-daemon.conf'\n" } # This is a service to forward traffic from WiFi to Ethernet. cat <<'EOF' >/usr/lib/systemd/system/parprouted.service [Unit] Description=proxy arp routing service Documentation=https://raspberrypi.stackexchange.com/q/88954/79866 Requires=sys-subsystem-net-devices-wlan0.device dhcpcd.service After=sys-subsystem-net-devices-wlan0.device dhcpcd.service [Service] Type=forking # Restart until wlan0 gained carrier Restart=on-failure RestartSec=5 TimeoutStartSec=30 # clone the dhcp-allocated IP to ethernet device so dhcp-helper will relay for the correct subnet ExecStartPre=/bin/bash -c '/sbin/ip addr add $(/sbin/ip -4 -br addr show wlan0 | /bin/grep -Po "\\d+\\.\\d+\\.\\d+\\.\\d+")/32 dev enp0s25' ExecStartPre=/sbin/ip link set dev enp0s25 up ExecStartPre=/sbin/ip link set wlan0 promisc on ExecStart=-/usr/sbin/parprouted enp0s25 wlan0 ExecStopPost=/sbin/ip link set wlan0 promisc off ExecStopPost=/sbin/ip link set dev enp0s25 down ExecStopPost=/bin/bash -c '/sbin/ip addr del $(/sbin/ip -4 -br addr show wlan0 | /bin/grep -Po "\\d+\\.\\d+\\.\\d+\\.\\d+")/32 dev enp0s25' [Install] WantedBy=wpa_supplicant.service EOF systemctl daemon-reload systemctl enable parprouted systemctl start parprouted dhcp-helper _______________________________________ PS. My Ethernet IP is manually set. Note Default gateway address! 192.168.1.10 255.255.255.0 0.0.0.0 Sami Mattila Internet-Content Telephone: 00358442421231 Email: [email protected] LinkedIN: samiedwardmattila Site: https://www.ic4.eu Perfect gift (1€/month). Family-name email address! https://rossi.id @rossi.id
Just tried this on my old Dell laptop Works like a charm. (Though Debian 12 needed the proprietary WIFI firmware repo added in APT sources.) Just remember to chmod +x the script.
Odd... Had to change order of apt install. DHCP first. Routing second. Sometimes DNS just dies. No idea why. My homelab Proxmox (that uses bridged network) can't get DHCP on local ethernet and since WIFI does not work with bridged networking... this does not work with Proxmox. Who ever decided that you can't bridge WIFI? I'd like to have a few words with him.
Next. How to add WIFI config with password from terminal and make this script work on headless Debian?
Debian Wiki has info: https://wiki.debian.org/WiFi/HowToUse Perhaps conmann or Using ifupdown and wpasupplicant. On Raspberry Pi I had instructions on how to write WIFI configuration to boot disk, I assume similar thing would work on regular Debian.
Seems like there is basically two practical ways to do WIFI with terminal only. Easy way is to add something like this in /etc/networking/interfaces Code: # Wireless interface allow-hotplug wlp1s0 iface wlp1s0 inet static address 192.168.1.101/24 gateway 192.168.1.1 wpa-ssid *** wpa-psk *** ...or use wpa_supplicant.conf file. Configure wpasupplicant: Code: wpa_passphrase SSIDNAME PASSWORD >> /etc/wpa_supplicant/wpa_supplicant.conf Determine wireless adapter device name: Code: root@px1:~# dmesg | grep wlp [ 4.374531] iwlwifi 0000:04:00.0 wlp1s0: renamed from wlan0 Create /etc/systemd/system/wpa_supplicant.service and add configuration (specify YOUR wireless interface on the ExecStart line): Code: touch /etc/systemd/system/wpa_supplicant.service Code: [Unit] Description=WPA supplicant Before=network.target After=dbus.service Wants=network.target IgnoreOnIsolate=true [Service] Type=dbus BusName=fi.w1.wpa_supplicant1 ExecStart=/sbin/wpa_supplicant -u -s -c /etc/wpa_supplicant/wpa_supplicant.conf -i wlp1s0 Restart=always [Install] WantedBy=multi-user.target Alias=dbus-fi.w1.wpa_supplicant1.service Enable wpasupplicant service: Code: systemctl enable wpa_supplicant Configure /etc/network/interfaces: Code: auto lo iface lo inet loopback iface enp0s25 inet manual auto wlp1s0 iface wlp1s0 inet manual address 192.168.1.100/24 gateway 192.168.1.1 auto vmbr0 # or bridge to other NIC iface vmbr0 inet static address 192.168.2.1/24 bridge-ports none bridge-stp off bridge-fd 0 source /etc/network/interfaces.d/* Restart wpa_supplicant and networking services to connect wireless adapter to wifi network: Code: systemctl restart wpa_supplicant && systemctl restart networking
