Specific Recommendations: Router Access
1. Shut down unneeded services on the router. Servers that are not running cannot break. Also, more memory and processor slots are available. Start by running the show proc command on the router, then turn off clearly unneeded facilities and services. Some servers that should almost always be turned off and the corresponding commands to disable them are listed below.
Small services (echo, discard, chargen, etc.)
no service tcp-small-servers
no service udp-small-servers
BOOTP - no ip bootp server
Finger - no service finger
HTTP - no ip http server
SNMP - no snmp-server
2. Shut down unneeded services on the routers. These services allow certain packets to pass through the router, or send special packets, or are used for remote router configuration. Some services that should almost always be turned off and the corresponding commands to
disable them are listed below.
CDP - no cdp run