6Models 2603, 2621, and 2635 Getting Started Guide ContentsRemote Site Configuration .................................................................................................................63Central site configuration ...................................................................................................................667 Security ......................................................................................................................................................... 68Introduction ..........................................................................................................................................................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 .............................................................................................................808 DHCP and DNS Configuration.................................................................................................................... 82Introduction ..........................................................................................................................................................83Services and features normally associated with each other ................................................................................83DHCP Server .................................................................................................................................................84Parameters for the DHCP Server subnet ...................................................................................................86IP Addresses to be available on this subnet ................................................................................................87DNS server option information .................................................................................................................88Default gateway option information ..........................................................................................................89Additional option information ..................................................................................................................89DHCP Relay ..................................................................................................................................................89Configuration of the DHCP Relay ............................................................................................................89DNS Relay ......................................................................................................................................................91Configuring the DNS Relay ......................................................................................................................919 IP Services ..................................................................................................................................................... 93IP Services .............................................................................................................................................................94WEB Server ....................................................................................................................................................94CLI Configuration ....................................................................................................................................94Associated Ports for the different System (IP) Services .....................................................................................9510 System Configuration.................................................................................................................................... 96Introduction ..........................................................................................................................................................97Authentication.......................................................................................................................................................97Alarm ....................................................................................................................................................................98Remote Access .......................................................................................................................................................99Update ................................................................................................................................................................100Save .....................................................................................................................................................................100Backup/Restore ...................................................................................................................................................100Restart .................................................................................................................................................................101