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Re: [K12OSN] transparent proxying with LTSP

On Feb 23, 2006, at 8:24 AM, Mark Gumprecht wrote:

I'm in the process of setting up IPCop as well. Anyone have dhcrelay working for ipcop? I'm trying to put an in-line filter with cop+ and still pass external dhcp requests. Or if some one has a better idea of how to accomplish that, I'm open. I would NAT, but it is a 1024 subnet and the middle of the school year... Also looking to get dansguardian on K12ltspEL for the labs.

Luis Montes wrote:

Brad Johnson wrote:

Greetings everyone,

I am in the final stages of completing our first large LTSP lab. In the past, I have been setting the proxy settings inside Firefox, but would prefer to do this transparently. Does anyone have any experience doing this with ipchains, or any GUI-based firewalls? What is your advice? I'd also prefer to redirect to an existing squid/dansguardian proxy that I already have, but I can live with setting up an additional proxy if I have to.



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What are you using for your existing proxy? I've used clarkconnect in the past on a seperate box, but now I'm using ipcop. Both can be setup as transparent filters, but ipcop(with the cop plus addon) lets you schedule automatic blocklists for free. I believe Eric has also done some dansgaurdian/squidgaurd work in k12 as well.


Ok guys, after a little googling, here is what I came up with. Now, before I do this, please know that I am not currently running ANY type of firewall on this LTSP box. If I create the following entry, do I need to then create additional entries to allow other types of traffic? I don't want my LTSP box to stop working because of the following rules:

iptables -t nat -A PREROUTING -i $INTERFACE -p tcp --dport 80 -j DNAT --to dansguardian/squid box:8080

Someone please tell me it's this easy!


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