Specifications

76 Chapter 4. Configuring Special Features
Chapter 4. ConÞguring Special Features
The features described in this chapter are advanced topics. They are primarily intended for experienced users and
network administrators to perform network management and more complex configurations.
¥ Multiple IP subnets
¥ Virtual routing tables
¥ Bridge filtering and IP firewall
¥ RIP (IP protocol controls)
¥ DHCP (Dynamic Host Configuration Protocol)
¥ NAT (Network Address Translation)
¥ PPPoE (PPP over Ethernet)
¥ Management security
¥ Dial backup to a V.90 modem
¥ VRRP backup for a static default gateway
Additional features can be purchased as software option keys. These features are described in Configuring
Software Options, page 114. To determine which software options are installed on your router, use the vers
command. (If a feature has not been enabled, it is listed with a ~ prefix.)