He polokalamu ʻo Uncomplicated Firewall (UFW) no ka mālama ʻana i kahi pā ahi netfilter i hoʻolālā ʻia e maʻalahi e hoʻohana. Hoʻohana ʻo ia i kahi interface laina kauoha me kahi helu liʻiliʻi o nā kauoha maʻalahi, a hoʻohana i nā iptables no ka hoʻonohonoho ʻana. Loaʻa ka UFW ma ka paʻamau i nā hoʻonohonoho Ubuntu āpau ma hope o 8.04 LTS.