Topic: Question

[Alibi]

I have an internet connexion (64Kbps) with a router (sisco2600) with accounts on it
I configured my esmith box to connect to this router via lan , all is ok , i can connect to internet , with my windows boxes via my esmith box
but a small problem is occuring:
when i connect to esmith it ask for a password i give him a password of internet connexion via router , ok , I connect . But other windows boxes  also connect without any password !
It's a normal thing because router is considering connexions comming from the esmith box , so it does not ask password any second time
what I asking for is how to put password i esmith box and manage local accounts , so win boxes will ask for local accounts , ?
thanx