RE: Blocking file type by iptables?

["George Vieira" <georgev@xxxxxxxxxxxxxxxxxxxxxx>]

But you can still block based on URL using squid.

 

Thanks,

 

____________________________________________
George Vieira
Citadel Computer Systems Pty Ltd Systems Manager georgev AT citadelcomputer DOT com DOT au

Citadel Computer Systems Pty Ltd

Phone : +61 2 9955 2644 HelpDesk: +61 2 9955 2698 http://www.citadelcomputer.com.au

 

 

-----Original Message-----
From: ads nat [mailto:adsnat@xxxxxxxxx]
Sent: Monday, August 25, 2003 12:59 PM
To: George Vieira; netfilter@xxxxxxxxxxxxxxxxxxx
Subject: RE: Blocking file type by iptables?

Even if you block all ports except 80. Kazza manages to access through port 80. So I don't think this will work.

Thanks

George Vieira <georgev@xxxxxxxxxxxxxxxxxxxxxx> wrote:

No because this is a bad idea. not only does the CPU have a bad day goign through every packet sniffing for file extensions but also that other innocent data can get blocked when it shouldn't be..

 

1. The only thing you can do is block all outgoing/incoming ports and allow only some (25,80)

2. Use transparent squid proxy to limit access and get it to use regex expressions on URLs you may also want to block.

3. Block any and all MSN/Kazaa/ICQ servers addresses

 

You could also setup a fake primary DNS domain like aol.com and icq.com and point to yourself... this is what I've done for ICQ to stop those damn ADs.. if the clients can't resolve the DNS for those domains then they also can't connect. But then they get smart and put a hosts file in their machine.. ;)

 

 

 

 

Thanks,

 

____________________________________________
George Vieira
Citadel Computer Systems Pty Ltd Systems Manager georgev AT citadelcomputer DOT com DOT au

Citadel Computer Systems Pty Ltd

Phone : +61 2 9955 2644 HelpDesk: +61 2 9955 2698 http://www.citadelcomputer.com.au

 

 

-----Original Message-----
From: ads nat [mailto:adsnat@xxxxxxxxx]
Sent: Monday, August 25, 2003 2:22 AM
To: netfilter@xxxxxxxxxxxxxxxxxxx
Subject: Blocking file type by iptables?

Hi,

I have gone through mail archives to check whether can be blocked. I also checked squid mailing list. But thre is no definite solution to block kazza file downloads. I would like t know whether using iptables can i block particular type of file. If I block .mpeg, .mp3 files through IPtables then it does not matter from which site file is coming. It will get blocked.

Any suggestion and solutions.

Thanks

---

Do you Yahoo!?
Yahoo! SiteBuilder - Free, easy-to-use web site design software

---

Do you Yahoo!?
Yahoo! 
SiteBuilder - Free, easy-to-use web site design software