We do it with squid and LDAP lookups. We have a nonprod attribute that if true 
allows squid access out. Otherwise  squid denies external connections.

Alkis Georgopoulos <alk...@gmail.com> wrote:

>Στις 04/07/2013 02:46 πμ, ο/η David Burleigh έγραψε:
>> I am in the process of setting up a computer lab with Ubuntu 12.04,
>LTSP, and 
>> a number of thin clients. All is well, except that I cannot figure
>out how to 
>> deny internet access to particular users while allowing internet
>access to 
>> others. Is there a straightforward way to do this on a per user
>basis?
>> 
>
>
>You can do it either with iptables,
>http://www.cyberciti.biz/tips/block-outgoing-network-access-for-a-single-user-from-my-server-using-iptables.html
>
>or with squid and identd, but I don't have a link handy for that one.
>
>We're planning to add support for user-based internet blocking in
>epoptes.org, stay tuned. :)
>
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