How to limit password length on Cisco router.
r1(config)#security passwords min-length 9
r1(config)#username satish password redhat
% Password too short - must be at least 9 characters. Password not configured.
r1(config)#username satish password redhat123456
Now you can see you cannot assign password whose lenght is less than 9 character.How to password protect Console Port.
To configure the console password, follow these steps.
Router(config)# line console 0
Router(config-line)# password CISCO
Router(config-line)# login
Router(config-line#Ctrl-Z
Router#How to password protect Auxilary (AUX Port) Port
To configure the auxilary password, follow these steps.
Router#config t
Router(config)#line aux 0
Router(config-line)#password cisco
Router(config-line)#login
Router(config-line)# Ctrl-Z
Router#How to password protect VTY Ports (Telnet Ports)
Configuring the VTY password is very similar to doing the Console and Aux ones. The only difference is that there are 5 VTY virtual ports, which are named 0, 1, 2, 3, and 4. You can use the shortcut 0 4 (a zero, a space, and 4) to set all 5 passwords at the same time.
To configure the VTY password, follow these steps.
Router#config t
Router(config)#line vty 0 4
Router(config-line)#password cisco
Router(config-line)#login
Router(config-line)# Ctrl-Z
Router#How to password protect Privileged Mode
The Enable Password is the old form of the password for “Privileged Mode”. Here the password is stored un-encrypted.
Router#config t
Router(config)#enable password cisco
Router(config-line)# Ctrl-Z
Router#Enable Secret provides better security since password is kept encrypted.
Router#config t
Router(config)#enable secret cisco
Router(config-line)# Ctrl-Z
Router#Encrypting Passwords
You want to encrypt passwords so that they do not appear in plain-text in the router configuration file.
To enable password encryption on a router, use the service password-encryption configuration command:
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#enable password ccna123
Router(config)#line vty 0 4
Router(config-line)#password ccna
Router(config-line)#line con 0
Router(config-line)#password linux
Router(config-line)#line aux 0
Router(config-line)#password hacking
Router(config-line)#exit
Router(config)#service password-encryption
Router(config)#end
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