[plug] squid.. squid-cache?

[John Usher (Maptek)]

Hey,

I think the squid redirector script is what you want to play with on the
student squid proxy.

Basically you would want a list of URL heads that were OK to go to and
you would do something like:

while (<>)
{
	if (/^http:\/\/www.youcangohere.com\//)
	{
		print "$_\n";
	} elsif (/^http:\/\/other.address.com\//)
	{
		print "$_\n";
	}
	else
	{
		print "http://local.machine/you.cannot.go.there.html\n";
	}
}

This is similar to the way adzap (http://www.zip.com.au/~cs/adzap/)
works, only in reverse - adzap redirects URLS that go to ads to
youcantgothere.html.

The tricky bit may be sorting out the content type for images and
returning a youcantgothere image rather than html. Otherwise you may see
many broken images on your pages.

You might want to change the above else to:

else
{
  if (/\.(gif|png|jpg|jpeg)$/)
  {
	$mytype = $1;
  }
  else
  {
      $mytype = "html";
  }
  print "http://local.machine/you.cannot.go.there.$mytype\n";
}

Along with parenting the student squid to the staff squid.

This would also mean that the students may be accessing the web directly
through the cache heirarchy, meaning you don't have to precache the
pages.

If you are using transproxy, you would have to replace the machine names
with IP addresses, which also means you have to make sure you get all
the IP addresses when a name maps to more than one address. Some .coms
map to MANY ip addresses.

...John...



-----Original Message-----
From: Greg Orange [mailto:orange at carey.wa.edu.au] 
Sent: Tuesday, 13 August 2002 4:02 PM
To: plug at plug.linux.org.au
Subject: Re: [plug] squid.. squid-cache?


Nope, the student network is completely cut off from the rest of the
world. I'll 
play with routing in a few months when I get the chance (: (the idea
being to 
connect the two networks together)

So I'd have an external device to transport data between the two
networks 
para-manually. ie plug/unplug into staff network, plug/unplug into
student 
network.

I guess you could say it's not a networking question, it's a
squid/caching 
question. As for browser proxies - I've got transproxy running.

Thanks,
Greg.

Quoting Paul Dean <paul at thecave.cantech.net.au>:

> Hya,
> 
> A couple of questions...
> Does the student network have a connection to the Internet? If so is
> it
> permanent too?
> 
> Do you have dynamic or static IP's?
> 
> The direction I'm going down is the you can setup the Staff Squid
> proxy
> to be the 'parent' proxy for the Student network via the Internet.
> The line in squid.conf for the student network;
> 'cache_peer proxy.carey.wa.edu.au parent 3128 3130'
> The address and ports need to be correct though.
> 
> On the staff network you will need have the specified ports open so
> squid can connect.
> 
> You can then setup ACL's for you cache's to work together.
> 
> The only fall back is that is only caches "browsed" web sites, meaning
> you must first have someone browse the site and then it will be
> cached,
> which I think the same ruling for scache, but won't update
> workstations
> local cache you will need to set the browser to do that.
> 
> On the workstations setup them to use a proxy on the ports you want
> them
> on.
> 
> I trust this is on the right track for you.
> 
> Hope this helps.
> 
> On Tue, 13 Aug 2002, Greg Orange wrote:
> 
> <snipo> 
> 
> -- 
> Paul...
> 
> /***** Experience is that marvelous thing that enables you to 
> 	recognize a mistake when you make it again. 
> 	-- Franklin P. Jones *****/
> 
> /*****All programmers are playwrights and all computers are lousy
> actors.
>            -- Unknown*****/
> 
> /* How smart are Computers? They seem to need instructions all the
> time... 
> 	-- Me */
> 
> 
> 



 - ---- -----
Greg Orange
IT Support
Carey Baptist College        http://www.carey.wa.edu.au