• NuFw
  NuFW is an "authenticating gateway". This means it requires authentication for any connections to be forwarded through the gateway.
  in Public bookmarks with nufw authenticating gateway means requires authentication connections forwarded
• PF: Authpf: User Shell for Authenticating Gateways
  Authpf(8) is a user shell for authenticating gateways. An authenticating gateway is just like a regular network gateway (a.k.a. a router) except that users must first authenticate themselves to the gateway before it will allow traffic to pass through it. When a user's shell is set to /usr/sbin/authpf (i.e., instead of setting a user's shell to ksh(1), csh(1), etc) and the user logs in using SSH, authpf will make the necessary changes to the active pf(4) ruleset so that the user's traffic is passed through the filter and/or translated using Network Address Translation or redirection. Once the user logs out or their session is disconnected, authpf will remove any rules loaded for the user and kill any stateful connections the user has open. Because of this...
  the OpenBSD FAQ page
  faq openbsd
  in Public bookmarks with authpf user authenticating gateways regular network a.k.a

authenticating from all users