[K12OSN] transparent proxying with LTSP--SOLVED

Burke Almquist balmquist at mindfirestudios.com
Fri Feb 24 13:46:36 UTC 2006

These lines even take care of access directly from the LTSP server,  
it's a slightly simpler setup with a separate machine, but this works.

On Feb 24, 2006, at 1:21 AM, Sudev Barar wrote:

> On 2/24/06, Brad Johnson <bjohnson at independence.k12.ia.us> wrote:
>>>> Ok, so here's what I've got......
>>>> LTSP network connects to LSTP server--connects to remainder of
>>>> LAN-- connects to Internet.  Where do I put the IPCop Box....do I
>>>> put it  directly between LTSP and the remainder of the LAN?
>>> Ours sits between our LAN and the internet.  If the clients on your
>>> LAN are transparently proxied, then your LTSP clients will also.
>>> This applies to your current configuration as well.
>>> Thanks for the help today guys.  I must admit, I am iptables-
>>> challenged.  Since I currently already had a squid/danguardian box
>>> on the network, my prefernce was to continue using it.  I then
>>> found an old post on the list from 2003, courtesy of Eric Harrison,
>>> that led me directly to this wiki link:
>> http://k12ltsp.org/phpwiki/index.php/WebFiltering%3AIntegration
>> which provided me with the two following rules:
>> iptables -t nat -A OUTPUT -p tcp --dport 80 -j DNAT --to-destination
>> iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to-
>> destination
> IPTables challanged as well. What would work if k12box is  iteself
> connecting to big bad internet? I want that all internet traffic from
> clients on this box (effectively traffic from the box itself) is
> routed always through squid/proxy running on the same box itself.
> With above syntax all tcp packets will be diverted to proxy:port
> given, which would inclde packets from squid/proxy itself. Is this
> correct hypothesis or I am wrong in assuming that packets after coming
> out of squid/proxy would not be to port 80???
> --
> Sudev Barar
> Learning Linux
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