68Chapter 7 SecurityChapter contentsIntroduction ..........................................................................................................................................................69Configuring the router ..........................................................................................................................................69Configuring the security interfaces.........................................................................................................................71Configuring Security Policies ..........................................................................................................................73Deleting a security Policy ..........................................................................................................................74Enabling the Firewall.............................................................................................................................................74Firewall Portfilters .................................................................................................................................................74Security Triggers....................................................................................................................................................75Intrusion Detection System (IDS) .........................................................................................................................78Introduction to NAT.............................................................................................................................................80Enabling NAT ................................................................................................................................................80Global address pool and reserved map .............................................................................................................80