Re: Has anyone asked Comcast to stop blocking inbound ports?

["Matthew Gillen" <user=50@nabble.blu.org>]

 Kristian Erik Hermansen wrote: 
> On Dec 20, 2007 8:12 PM, Matthew Gillen <[hidden email]> wrote: 
>> Well when using nmap, supposing your firewall is off, if you get back 
>> "port closed", then your ISP is letting the SYN through.  If you get 
>> "filtered", then you know the ISP is blocking. 
> 
> This is not necessarily true.  It is possible for any upstream ISP to 
> inject RST packets at will, and this is potentially what Comcast does 
> for some services.  If you get no response, then it usually means the 
> packet is being filtered or your peered host did not like you... 

This is exactly what I was talking about in the second half of the message 
(the part you didn't quote about the EFF's tool). 

Matt 

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