Wireless to Ethernet

The purpose of this setup is to share a wireless internet connection over an Ethernet connection, enabling other devices to access the internet via the Ethernet network created on Mecha Comet.

Prerequisites

• Ensure you have nmcli and nftables installed on Mecha Comet.
• Replace wlan0 and end0 with your actual Wireless interface and outbound network interface names.
• Ensure Mecha Comet is connected to wireless and have internet access.

Steps

1

Connect Mecha Comet to a Device with an Ethernet Port

Physically connect the Mecha Comet to another device (e.g., a laptop / desktop / mecha comet) using an Ethernet cable. Ensure the Ethernet port is functional on both devices.

2

Check Existing Network Connections

$ nmcli connection show

Identify the name of the Ethernet connection you want to modify (e.g., Wired connection 1).

3

Configure IPv4 Method to Shared

$ sudo nmcli connection modify "<connection-name>" ipv4.method shared

4

Bring Up the Ethernet Connection

$ sudo nmcli connection up "<connection-name>"

5

Configure NAT with nftables

Create a NAT Table

$ sudo nft add table ip nat"

Add a NAT Chain

$ sudo nft add chain ip nat POSTROUTING { type nat hook postrouting priority 100 \; }

Add a Masquerade Rule for outgoing traffic through Wireless

$ sudo nft add rule ip nat POSTROUTING oif "wlan0" masquerade

Verification

Verify the Ethernet connection status:

nmcli device status

Check the NAT table rules to confirm the configuration:

sudo nft list table ip nat

Notes

• Ensure your Ethernet adapter is functional and properly connected.
• Replace interface names as needed for your specific setup.

Troubleshooting

• If the Ethernet connection fails to start, ensure the cable is securely connected.
• Verify that nftables is enabled and properly configured.