• IP Filter
  TCP/IP Firewall/NAT Software
  in FreeBSD > networking with firewall freebsd ipnat nat networking software tcp
• IPFILTER & IPNAT
  in FreeBSD > networking with firewall freebsd ipfilter ipnat nat networking
• Setting up IPNAT on FreeBSD 4.7
  in FreeBSD > networking with firewall freebsd ipnat nat networking

nat from all users