The way to limit a cisco router so only one computer(IP address) can telnet to it is by using an ACL or is there a better way?
by 
Oddjob
ANSWERS: 2
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There is more than one way but only one way is easy. Option 1: create an ACL and apply it as an inbound access-class on vty 0-4 or vty 0-X as it applies to your version of router/switch and IOS. Option 2: use TACACS+ and setup a login group and limit logins from that group to an address, address range or prefix. In a large router deployment, TACACS+ is a better way to go (but make sure you default to local in case your network is down and cant reach the tacacs+ server)
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When you say telnet I am assuming you mean ssh. access-list 101 permit 22 {hosts}
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