iiNet Budii Lite - DNS, UPnP, and DDNS; DNS Explanation and Management; UPnP (Universal Plug and Play)

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DNS (DOMAIN NAME SERVER), UPNP (UNIVERSAL PLUG AND PLAY)
AND DDNS (DYNAMIC DOMAIN NAME SERVER)
Normally,your Internet Service Provider
manages the way your computer looks
up IP addresses and domain names. If
you need to change these settings, can
do so within the DNS, UPnP and DDNS
section of Advanced Settings. You can
also enable and disable UPnP (Universal
Plug and Play).