Use OpenWRT to make D-Link DWR-116 into a Wi-Fi to Ethernet relay
You can use an old router such as D-Link DWR-116 when you need to receive a Wi-Fi signal and send it over RJ-45 wire. This helps when configuring a new system, e.g. Raspberry PI or FreeBSD, and you need immediate connectivity by simply inserting the ethernet cable, so you can connect via SSH right away, or simply don't want to manually edit the text file to configure wi-fi.