unbound

• /etc/unbound/unbound.conf

  server:
      access-control: 192.168.0.0/24 allow
      access-control: 192.168.1.0/24 allow
      do-ip4: yes
      do-ip6: yes
      do-tcp: yes
      do-udp: yes
      interface: 0.0.0.0
      interface: ::0
      rrset-roundrobin: yes
  
  include: "/etc/unbound/unbound.conf.d/*.conf"
  
  forward-zone:
      name: "."
      forward-addr: 9.1.2.3
      forward-addr: 9.4.5.6
      forward-addr: 9.7.8.9
  

• /etc/unbound/unbound.conf.d/redirect.conf

  server:
      local-zone: "doubleclick.net" redirect
      local-data: "doubleclick.net A 127.0.0.1"
  

• /etc/unbound/unbound.conf.d/static.conf

  server:
      local-zone: "sub.domain.tld" static
      local-data: "sub.domain.tld 3600 IN A 1.2.3.4"
      local-data: "sub.domain.tld 3600 IN A 5.6.7.8"
      local-data-ptr: "1.2.3.4 sub.domain.tld"
      local-data-ptr: "5.6.7.8 sub.domain.tld"