Message: 7 Date: Fri, 5 Mar 2010 17:40:45 -0600 From: Chris Boyd <cboyd@gizmopartners.com> Subject: Re: Problem from Comcast Network to The Planet To: nanog@nanog.org Message-ID: <5DF52A7E-7288-433B-8B08-EA9530B29400@gizmopartners.com> Content-Type: text/plain; charset=us-ascii

I don't know what's going on in the Comcast network, but I've been having similar fits with a single IP address in my network. Comcast can get to nearby IP addresses in the same /24 no issue. The Comcast customer in my case is in Florida, and I get to them via TWTelecom.

I know it's not my net, and TWT was very helpful and knows it's not their net.

Attempts to get Comcast to look into it seem to end with them pinging their customer's IP address from the Comcast support center and terminating the call "since they can reach them."

--Chris Chris, Maybe Comcast abuse is blackholing the host? What is the host IP? Is it more than one Comcast customer unable to reach that host? What is the IP of the Comcast customer(s) unable to reach it? What do traces from the host to the customer and from customer to host look like?