Overview # This chapter describes how to configure OpenBSD as a small router and firewall using two network interfaces: one WAN interface that connects to the Internet service provider and one LAN interface that connects to the local network. The configuration enables IPv4 forwarding, network address translation (NAT), stateful firewalling, IPv4 address assignment with DHCP, and local DNS caching. A router forwards IP packets between networks. A firewall enforces a policy controlling which pa...
