I have created 9 vlans on a cisco packet tracer(Router-on-stick). The sub-interface ip are as follows:
fa4/0.10- 192.168.10.1
fa4/0.20- 192.168.20.1
fa4/0.30- 192.168.30.1
My biggest problem here is that a user from vlan 10 can easily telnet into the router using the sub-interface ip 192.168.10.1. how can I block all users telneting into the router except the administrator who is on vlan 9.