Is there a simple way to detect ISP port blocking?

Posted by Will M on Super User See other posts from Super User or by Will M
Published on 2009-07-22T16:14:44Z Indexed on 2010/04/23 6:23 UTC
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Filed under:

isp

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port

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block

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networking

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firewall

Is there a way to tell the difference between my ISP blocking traffic on certain ports and my NAT router/firewall blocking that traffic? The sites “Shields Up” and “Can you see me” show my ports closed or not accessible, but I assume that is primarily due to the NAT router. (Obviously, I could just remove the router, connect directly and use those sites, but is there a simple way to test without doing that?)

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