Re: proxy network server configuration

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Date: Thu, 26 Feb 2004 12:57:26 +1030

On Wed, 25 Feb 2004 03:38:24 GMT,
Phisherman <nobody@noone.com> wrote:

> I have a Linux computer and two Windows 98SE computers. All are
> connected to a hub. The Linux computer using pppd, calls my ISP using
> an external modem connected to the Linux computer's serial port. I
> start Squid, and the Windows computers can surf fine with IE.
>
> But on the Win98 machines, email does not work (POP3 & SMTP ports
> 110, 25), Agent newsreaders don't work (port 115), Norton NAV update
> doesn't work (port ?), and RealPlayer (port ?) does not work.
>
> I've done some reading on transparent proxy and iptables, but I'm not
> sure what I need to do next to get these applications to work
> properly. Any reading suggestions for a newbie?

Thus far, you're using squid to share the ability to web browse. It's
acting as a proxy on behalf of the other web browsers. To share other
network protocols, you need to do something like NAT (Network Address
Translation). Iptables and ipforwarding are the first things that you
want to look into to set that up.

You haven't said which particular Linux you're using, some have easier
ways of setting this up than others (configuration GUIs versus
hand-editing configuration files).

If you want to play with something that does this for you, you could
look at the firestarter firewalling package (I don't know it's WWW
location, you'll have to search for it).

Conversely, if you'd like to hand-craft some scripts or configuration
files, you might want to start by looking at this webpage:
<http://www.yolinux.com/TUTORIALS/LinuxTutorialNetworkGateway.html>. It
was the one that made the most sense to me when I first got my network
going.

You can always hand-edit your configuration after using some GUI tool,
if you like that sort of thing. But the other way around can be fraught
with problems (the GUI tools might override other things, or depend on
configuration files being written in an exact manner).

Remember to firewall your system properly against outside exploits, but
don't firewall yourself so much that you can't do anything.

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