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04.02.2008 at 01:56PM PDT, ID: 23290898
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How to block Sopcast on my firewall?

Tags:

sopcast, cisco pix, block ports

Hi experts,

One of the networks I administer is behind a Cisco Pix 515E and a number of the users behind this firewall are using Sopcast, causing the Internet connection to throttle. The powers that be have said it must be blocked on the firewall, but I cannot seem to find the definitive port numbers for Sopcast. I've even heard it uses "Firewall and NAT traversal technology to pass 90% P2P barriers".

Is this true? If so, how can I prevent it from working?

Thanks

Jon
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Question Stats
Zone: Software
Question Asked By: jonathen
Solution Provided By: mkielar
Participating Experts: 1
Solution Grade: A
Views: 35
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04.02.2008 at 02:23PM PDT, ID: 21267680

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04.02.2008 at 05:17PM PDT, ID: 21268743

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04.03.2008 at 01:11AM PDT, ID: 21270449

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04.03.2008 at 09:16AM PDT, ID: 21274130

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04.02.2008 at 02:23PM PDT, ID: 21267680

Rank: Master

As a starter....the BEST firewall policy is to block all outbound and then open ports as you need them.

However, there are a number of P2P apps that will function over port 80, so alas the only foolproof method is some sort of advanced packet inspection, which is only something that a more advanced firewall setup or IDS/IPS will allow you. And even at that, since P2P changes almost daily, keeping packet signatures up to date can be a real hassle. And furthermore, newer P2P clients are using encryption, making the process even more frustrating.

More or less, if you only have port-based firewall functionality, block everything beside the usual suspects outbound (80, 443, etc) and keep an eye on traffic logs.

I'm going to research this a little more and see if I can come up with some more ideas.
Accepted Solution
 
04.02.2008 at 05:17PM PDT, ID: 21268743

Rank: Master

Here's s good article with reviews on some enterpise level web filters.
http://www.pcmag.com/article2/0,2817,1538995,00.asp

Or depending on your budget/network size, here's some local comuter programs that might help;
http://internet-filter-review.toptenreviews.com/

 
04.03.2008 at 01:11AM PDT, ID: 21270449
Thanks for that mkielar. The network is already behind a Websense Enterprise web filter which filters all http traffic before allowing it through the Pix. However, this does not seem to have the ability to filter Sopcast. I will look into the options you've listed above.

Are there any specific URLs or IP's that are always used with Sopcast? If there were, I could block those at least...
 
04.03.2008 at 09:16AM PDT, ID: 21274130

Rank: Master

From what I was able to find last night, I'm not sure. Being that it is a P2P it could potentially use a different port and destination address every time. Although, I'm thinking that there is some main server that hosts the links to all the pc's in the P2P network. I'll keep looking for you and if I find anything more, I'll let you know..
 
 
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