ipfilter and transparent proxy through squid

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Hello,
how can I achieve the same as stated in the link below, but using ipfilter?
http://www.cyberciti.biz/tips/linux-setup-transparent-proxy-squid-howto.html
thanx for any help
Gabriele.
Gabriele Bulfon - Sonicle S.r.l.
Tel +39 028246016 Int. 30 - Fax +39 028243880
via Enrico Fermi 44 - 20090, Assago - Milano - Italy
http://www.sonicle.com

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<div style="font-family: Verdana; font-size: 12;">Hello,<br>how can I achieve the same as stated in the link below, but using ipfilter?<br><br><a href="http://www.cyberciti.biz/tips/linux-setup-transparent-proxy-squid-howto.html">http://www.cyberciti.biz/tips/linux-setup-transparent-proxy-squid-howto.html</a><br><br>thanx for any help<br>Gabriele.<br><div><br>
<table style="border: 1px solid #aaaaaa" border="0" cellspacing="0">
<tbody><tr>
 <td style="padding: 2px 2px 2px 2px"><a target="_blank" href="http://www.sonicle.com">
<img src="http://www.sonicle.com/images/sent-through-sonicle-webtop-90x90.png" border="0" height="90" width="90"></a></td>
 <td valing="top" style="padding: 2px 8px 2px 16px" align="left">
<font face="Arial" size="2">
<b>Gabriele Bulfon - Sonicle S.r.l.</b><br><br>
Tel +39 028246016 Int. 30 - Fax +39 028243880<br>
via Enrico Fermi 44 - 20090, Assago - Milano - Italy<br>
<a href="http://www.sonicle.com">http://www.sonicle.com</a>
</font>
 </td>
</tr>
</tbody></table>
</div></div>

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