A Wifi relay or router is typically a standalone device. Consequently it is usually headless.

Headless Raspbian Howto is outside the scope of this presentation, but the following are typical differences from original Raspbian.

• storage space

  /etc/fstab

  partition table closed cleanly

  partitions for temporary and persistent data

• network address

  /etc/hostname

  name unique to LAN

  /etc/hosts

  127.0.1.1 set to hostname

• network devices

  /etc/network/interfaces.d/010_eth0

  static wired ip

  /etc/network/interfaces.d/011_wlan0

  static wireless ip

  /etc/wpa_supplicant/wpa_supplicant.conf

  static wireless association

  /etc/resolvconf.conf

  static dns server selection

  /etc/network/interfaces

  remove/comment obsolete/replaced devices