Can 2600 Router ver. 12.3 use Radius Server to Authenticate Logon

Sure. RADIUS or TACACS+..

Shouldn't be too hard to find, its been part of IOS for quite some time.

Here's a link to the basics in 12.2 documentation.

You could use Radius but I would use TACACS+. First RADIUS is clear text so you could have someone actually get your password if they are sniffing the datastream. I really do not like Cisco software, I REALLY like Cisco ACS. You can also set it up to use your windows domain to authenticate to. You can do SSOOO MUCH with Cisco ACS! Hear is a simple RADIUS config.

aaa new-model ! aaa authentication login default group radius local ! Always config a fallback in case you cant get to the AAA server radius-server host 172.22.53.201 auth-port 1645 acct-port 1646 key cisco ! Some IOSes want you to put the key on a seperate line

This will just get you logged in there are the two other A's (authorization, and accounting) that you may also configure.

Greg

Huh? RADIUS encrypts passwords across the network. The difference between TACACS+ and RADIUS is that TACACS+ encrypts the whole packet. RADIUS encrypts just the password, leaving the rest of the packet plain.

Passwords are both encrypted as they go over the network for either protocol.

I did not know that, Thanks for the correction.