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A Tool for Building Firewall-Router Configurations
Several commercial firewall solutions are currently available, but they may not be appropriate for all situations because of their expense, lack of flexibility, or lack of scalability. Instead, many firewalls are built using packet-filtering routers. One big impediment to building router-based firewalls is how poorly the configuration languages used to describe the proper operation of the routers are suited to the job of building and maintaining robust ûrewalls. These languages are overly tersedblp:journals/csys/Calabrese96 fatcat:ktbt4cnx3bds7oy6kevlbnc2ie