DHCP with nmcli to allow ethernet devices to connect

supagu · 8 October 2022 22:46

I have an old laptop I’m trying to turn into a router. So I want to set it up that when I plug another computer into the ethernet port it is automatically assigned an IP and gets access to the bridged wifi where it can access the internet.

So far I have setup in nmcli a bridge which enslaves the eno1 device + sets up the wifi.
But I am stuck trying to get the eno1 device to work.

I am making this a generic script here:

github.com

bit-shift-io/scripts/blob/master/router.sh

#!/bin/bash

# network manager version of network bridge



phone_wifi_device='wlp0s20u2' # which devices for connecting to phone hotspot?
lan_wifi_device='wlp4s0' # which device for LAN devices?

ssid='spud_test' # Enter what you want to call your wifi

# reset to defaults
echo '[Router] Resetting network manager defaults'
sudo rm -rf /etc/NetworkManager/*
sudo systemctl restart NetworkManager

#exit # enable this line to reset the networking to linux default

echo "Enter password you want for your wifi '${ssid}' (min length 8): "
read ap_password

This file has been truncated. show original

on line 57 I enslave the eno1 device.

I’ve tried a few things such as setting ‘ipv4.method shared’ on the bridge connection:

    echo "[Router] Editing connection ${connection_name}"
    nmcli connection modify ${line} ipv4.method shared

I’ve tried setting the ipv4.method also on the bridge… but nothing seems to work.
When ever I plug in another computer it tries to connect then fails.

Can someone point me in the right direction?

zbe · 9 October 2022 06:04

Why are you bridging interfaces if you want to have a router? I’m not sure I understand anything in that script or why you would need a script at all…

Perhaps draw a network - how it is supposed to look.

Some reading: Router - ArchWiki