NBFW is a patch for Samba which allows a Samba server which is running on a masquerading firewall to masquerade netbios packets from a private LAN to a public LAN. With NBFW, computers on the private LAN show up in the browselists and can browse the public LAN. With sufficient OS support (such as Linux portfw or natd) it's possible to access the shares of the computers on the private LAN from the public LAN.
