NuFW is an authenticating gateway, which means that connections are authenticated before being forwarded through the gateway. Classical packet filtering systems disregard the identity of the user who may be attempting to access the network, instead caring only about the originating IP addresses.
Nufw is the daemon that receives some network packets through the QUEUE netfilter rule. Informations about those packets are forwarded to the nuauth daemon, which decides if packets should be accepted or denied, sends back the information to Nufw that applies decisions.
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