Telnet & SSH sessions setup commands

2URGSE

I went over this lab a few times, but just wanted to clarify:


line vty 0 4 will this allow up to 5 telnet connections to the router?

line con 0 will this allow a single console connection?

login local can someone briefly explain this one?



Thanks,

gosh1976

I believe if you are use the login local command when configuring a vty line then the local authentication database will be used. so if you telnet in to the device it will ask you for a username and password and not just a password.

line vty 0 4 does indeed reference 5 vty connections.
Isn't there usually just one console port on a device? regardless I believe settings under line console 0 would reference the one connection

somebody with a better understanding might be able to give a better answer

2URGSE

phoeneous wrote: »

Uses local user database instead of a password. So use must create user accounts first before issuing this command otherwise you could lock yourself out.

Thank you!

Somnipotent

2URGSE wrote: »

I went over this lab a few times, but just wanted to clarify:


line vty 0 4 will this allow up to 5 telnet connections to the router?

line con 0 will this allow a single console connection?

login local can someone briefly explain this one?



Thanks,

1. cisco likes to count from 0... your lines are 0, 1, 2, 3, & 4.

2. 1 console port = 1 connection. you can also plug into the aux 0 port if you have it configured and it will give you the same thing. the aux port is mainly used for dial backups

3. login local means to look for the username password in the router itself. if you just apply login, the IOS will ask for the password and that is all. if you use login local, you would assume that you've created a username/priviledge/password database (which you should if you've have if you've configured ssh).

thenjduke

do not forget the transport input telnet ssh command as well.

2URGSE

thenjduke wrote: »

do not forget the transport input telnet ssh command as well.

Yes, I see that in there. The lab walks you through the commands, but I Just wanted to make sure I understood exactly what each them does.

There is also the RSA key generation command.

crypto key generate rsa

Is this to authenticate something in the login process?

Somnipotent

2URGSE wrote: »

Yes, I see that in there. The lab walks you through the commands, but I Just wanted to make sure I understood exactly what each them does.

There is also the RSA key generation command.

crypto key generate rsa

Is this to authenticate something in the login process?

it generates a key used for authentication... do a show run and you'll see it.

crypto key generate rsa general mod 1024

mgeorge

Configuring Secure Shell Virtual Terminal Access (SSH) | Free CCNA Workbook

mtorres

2URGSE wrote: »

Yes, I see that in there. The lab walks you through the commands, but I Just wanted to make sure I understood exactly what each them does.

There is also the RSA key generation command.

crypto key generate rsa

Is this to authenticate something in the login process?

This creates the key ssh uses to encrypt the data being sent back and forth ie passwords, commands, etc. You have to issue the ip domain-name domain.com command in order for this to work, replace domain.com with whatever your domain name is.

thenjduke

2URGSE wrote: »

Yes, I see that in there. The lab walks you through the commands, but I Just wanted to make sure I understood exactly what each them does.

There is also the RSA key generation command.

crypto key generate rsa

Is this to authenticate something in the login process?

This create the keys for authentication to be used for sdm via https or ssh.
the command is crypto key generate rsa general keys and make it 1024