Security - Use of PasswordAuthentication by ltsp clients.

I have an ltsp server in an elementary/middle school with ltsp clients 
on eth0 and (eventually) the public internet on eth1.   I want to access 
this machine from the internet for remote administration, so for 
security I really need to be able to disable PasswordAuthentication, at 
least on eth1, and use publickey authentication only.   I'm particularly 
concerned about this because of the weak passwords that the kids are 
likely to use.

Apparently the ltsp clients use PasswordAuthentication, so when I 
disable it, none of the ltsp clients can login.

So, either:
    - is there a way to disable PasswordAuthentication on just eth1 ?
or:
    - is there a way to automatically configure key pairs for the ltsp 
users and use them in the ltsp cliet/server connections?


-- 
John Ellson

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