Note: do not expect lightning performance and/or have a list of dozens of MB for url_filter (specifications recommended minimum 256Mb of ram and the DS has 128), but it works! Ingredients: :) 1) DS with patched uboot to load the OS from usb pendrive. 2) access to the serial console of DS: is necessary to the first set up of ipfire, then just use the gui). 3) an ethernet port usb (I foundby sebonweb - Off-Topic