I woul dliek to create a baseline (standard) for configuring routed physical and virtual interfaces. You know, disabling certain services by default...
I have TWO questions, please:
1. Does the following dialogue make sense? Am I missing something?
With regard to a baseline configuration, routed physical interfaces can be treated the same as Switched Virtual Interfaces (SVI), since they both share many of the same security vulnerabilities and operational characteristics.
Router(config)# interface type [slot/port]
(interface can be Ethernet, serial or vlan)
Router(config-if)# no ip proxy-arp
(disables default proxy-arp behavior)
Router(config-if)# no ip redirect
(disables icmp redirects when default router is down. Use this with HSRP setup)
Router(config-if)# no ip unreachable
(disables icmp unreachable messages in response to icmp echos)
Router(config-if)# no ip directed-broadcast
(applications don't use this anymore. Disable to prevent broadcast storms during a DoS attack)
(shut down unused interfaces. Otherwise, issue the no shut command to enable)
2. In the event that subinterfaces are being used, do you apply these commands to the physical/main interface or the subinterfaces?