The access router is the common name of the exterior router present in the screened host firewall architecture. It is attached to the perimeter network and the internet. Access router is used to protect both the perimeter network and the internal network from the Internet. It allows anything that is outbound from the perimeter network. Access router seldom do packet filtering. The rules for packet filtering, which is used to protect internal machines are always same on both the interior router and the exterior router.
