for detecting DOS attacks (DDOS)
show ip cache show ip cache fastEthernet 0/0.311 flow
Compress the running config then write it to the startup memory
configure service compress-config write mem
Setup a default route. The following routes all traffic to 192.168.1.1
R2(config)#ip route 0.0.0.0 0.0.0.0 192.168.1.1