Synopsis # This chapter assembles end-to-end reference designs built from components covered earlier. It presents three canonical patterns: Redundant Internet Edge with carp(4) , pfsync(4) , per-uplink NAT and policy routing in pf.conf(5) , managed by pfctl(8) . Campus/Branch Routed Access using VLAN SVIs, Router Advertisements with rad(8) , internal recursion via unbound(8) , authoritative zones with nsd(8) , and DHCP with dhcpd(8) . Regional POP with either an MPLS LDP core via ldpd(8) and ...