Configure OpenWRT as a wired-wireless bridge

Here is a typical /etc/config/network config file to setup a fonera as a bridge between the wired (eth0) and wireless (ath0) interfaces:

# Loopback
config interface loopback
    option ifname   "lo"
    option proto    static
    option ipaddr   127.0.0.1
    option netmask  255.0.0.0

# LAN
config interface lan
    option type     bridge
    option ifname   "eth0"
    option proto    static
    option ipaddr   192.168.1.1
    option netmask  255.255.255.0

# WiFi
config interface wifi
    option ifname   "ath0"
    option proto    static
    option ipaddr   192.168.40.199
    option netmask  255.255.255.0